' . "\n";
            $mail->SMTPDebug = true;
        }
        $mail->Host = $CFG->smtphosts;               // specify main and backup servers

        if ($CFG->smtpuser) {                          // Use SMTP authentication
            $mail->SMTPAuth = true;
            $mail->Username = $CFG->smtpuser;
            $mail->Password = $CFG->smtppass;
        }
    }

    $adminuser = get_admin();

    // make up an email address for handling bounces
    if (!empty($CFG->handlebounces)) {
        $modargs = 'B'.base64_encode(pack('V',$user->id)).substr(md5($user->email),0,16);
        $mail->Sender = generate_email_processing_address(0,$modargs);
    }
    else {
        $mail->Sender   = $adminuser->email;
    }

    if (is_string($from)) { // So we can pass whatever we want if there is need
        $mail->From     = $CFG->noreplyaddress;
        $mail->FromName = $from;
    } else if ($usetrueaddress and $from->maildisplay) {
        $mail->From     = $from->email;
        $mail->FromName = fullname($from);
    } else {
        $mail->From     = $CFG->noreplyaddress;
        $mail->FromName = fullname($from);
        if (empty($replyto)) {
            $mail->AddReplyTo($CFG->noreplyaddress,get_string('noreplyname'));
        }
    }

    if (!empty($replyto)) {
        $mail->AddReplyTo($replyto,$replytoname);
    }

    $mail->Subject = substr(stripslashes($subject), 0, 900);

    $mail->AddAddress($user->email, fullname($user) );

    $mail->WordWrap = 79;                               // set word wrap

    if (!empty($from->customheaders)) {                 // Add custom headers
        if (is_array($from->customheaders)) {
            foreach ($from->customheaders as $customheader) {
                $mail->AddCustomHeader($customheader);
            }
        } else {
            $mail->AddCustomHeader($from->customheaders);
        }
    }

    if (!empty($from->priority)) {
        $mail->Priority = $from->priority;
    }

    if ($messagehtml && $user->mailformat == 1) { // Don't ever send HTML to users who don't want it
        $mail->IsHTML(true);
        $mail->Encoding = 'quoted-printable';           // Encoding to use
        $mail->Body    =  $messagehtml;
        $mail->AltBody =  "\n$messagetext\n";
    } else {
        $mail->IsHTML(false);
        $mail->Body =  "\n$messagetext\n";
    }

    if ($attachment && $attachname) {
        if (ereg( "\\.\\." ,$attachment )) {    // Security check for ".." in dir path
            $mail->AddAddress($adminuser->email, fullname($adminuser) );
            $mail->AddStringAttachment('Error in attachment.  User attempted to attach a filename with a unsafe name.', 'error.txt', '8bit', 'text/plain');
        } else {
            require_once($CFG->libdir.'/filelib.php');
            $mimetype = mimeinfo('type', $attachname);
            $mail->AddAttachment($CFG->dataroot .'/'. $attachment, $attachname, 'base64', $mimetype);
        }
    }



/// If we are running under Unicode and sitemailcharset or allowusermailcharset are set, convert the email
/// encoding to the specified one
    if (!empty($CFG->unicodedb) && (!empty($CFG->sitemailcharset) || !empty($CFG->allowusermailcharset))) {
    /// Set it to site mail charset
        $charset = $CFG->sitemailcharset;
    /// Overwrite it with the user mail charset
        if (!empty($CFG->allowusermailcharset)) {
            if ($useremailcharset = get_user_preferences('mailcharset', '0', $user->id)) {
                $charset = $useremailcharset;
            }
        }
    /// If it has changed, convert all the necessary strings
        if ($mail->CharSet != $charset) {
        /// Save the new mail charset
            $mail->CharSet = $charset;
        /// And convert some strings
            $mail->FromName = $textlib->convert($mail->FromName, 'utf-8', $mail->CharSet); //From Name
            foreach ($mail->ReplyTo as $key => $rt) {                                      //ReplyTo Names
                $mail->ReplyTo[$key][1] = $textlib->convert($rt, 'utf-8', $mail->CharSet);
            }
            $mail->Subject = $textlib->convert($mail->Subject, 'utf-8', $mail->CharSet);   //Subject
            foreach ($mail->to as $key => $to) {
                $mail->to[$key][1] = $textlib->convert($to, 'utf-8', $mail->CharSet);      //To Names
            }
            $mail->Body = $textlib->convert($mail->Body, 'utf-8', $mail->CharSet);         //Body
            $mail->AltBody = $textlib->convert($mail->AltBody, 'utf-8', $mail->CharSet);   //Subject
        }
    }

    if ($mail->Send()) {
        set_send_count($user);
        return true;
    } else {
        mtrace('ERROR: '. $mail->ErrorInfo);
        add_to_log(SITEID, 'library', 'mailer', $FULLME, 'ERROR: '. $mail->ErrorInfo);
        return false;
    }
}

/**
 * Sets specified user's password and send the new password to the user via email.
 *
 * @uses $CFG
 * @param user $user A {@link $USER} object
 * @return boolean|string Returns "true" if mail was sent OK, "emailstop" if email
 *          was blocked by user and "false" if there was another sort of error.
 */
function setnew_password_and_mail($user) {

    global $CFG;

    $site  = get_site();
    $from = get_admin();

    $newpassword = generate_password();

    if (! set_field('user', 'password', md5($newpassword), 'id', $user->id) ) {
        trigger_error('Could not set user password!');
        return false;
    }

    $a->firstname   = $user->firstname;
    $a->sitename    = $site->fullname;
    $a->username    = $user->username;
    $a->newpassword = $newpassword;
    $a->link        = $CFG->wwwroot .'/login/';
    $a->signoff     = fullname($from, true).' ('. $from->email .')';

    $message = get_string('newusernewpasswordtext', '', $a);

    $subject  = $site->fullname .': '. get_string('newusernewpasswordsubj');

    return email_to_user($user, $from, $subject, $message);

}

/**
 * Resets specified user's password and send the new password to the user via email.
 *
 * @uses $CFG
 * @param user $user A {@link $USER} object
 * @return bool|string Returns "true" if mail was sent OK, "emailstop" if email
 *          was blocked by user and "false" if there was another sort of error.
 */
function reset_password_and_mail($user) {

    global $CFG;

    $site  = get_site();
    $from = get_admin();

    $external = false;
    if (!is_internal_auth($user->auth)) {
        include_once($CFG->dirroot . '/auth/' . $user->auth . '/lib.php');
        if (empty($CFG->{'auth_'.$user->auth.'_stdchangepassword'})
            || !function_exists('auth_user_update_password')) {
            trigger_error("Attempt to reset user password for user $user->username with Auth $user->auth.");
            return false;
        } else {
            $external = true;
        }
    }

    $newpassword = generate_password();

    if ($external) {
        if (!auth_user_update_password($user->username, $newpassword)) {
            error("Could not set user password!");
        }
    } else {
        if (! set_field("user", "password", md5($newpassword), "id", $user->id) ) {
            error("Could not set user password!");
        }
    }

    $a->firstname = $user->firstname;
    $a->sitename = $site->fullname;
    $a->username = $user->username;
    $a->newpassword = $newpassword;
    $a->link = $CFG->httpswwwroot .'/login/change_password.php';
    $a->signoff = fullname($from, true).' ('. $from->email .')';

    $message = get_string('newpasswordtext', '', $a);

    $subject  = $site->fullname .': '. get_string('changedpassword');

    return email_to_user($user, $from, $subject, $message);

}

/**
 * Send email to specified user with confirmation text and activation link.
 *
 * @uses $CFG
 * @param user $user A {@link $USER} object
 * @return bool|string Returns "true" if mail was sent OK, "emailstop" if email
 *          was blocked by user and "false" if there was another sort of error.
 */
 function send_confirmation_email($user) {

    global $CFG;

    $site = get_site();
    $from = get_admin();

    $data->firstname = fullname($user);
    $data->sitename = $site->fullname;
    $data->admin = fullname($from) .' ('. $from->email .')';

    $subject = get_string('emailconfirmationsubject', '', $site->fullname);

    /// Make the text version a normal link for normal people
    $data->link = $CFG->wwwroot .'/login/confirm.php?p='. $user->secret .'&s='. $user->username;
    $message = get_string('emailconfirmation', '', $data);

    /// Make the HTML version more XHTML happy  (&)
    $data->link = $CFG->wwwroot .'/login/confirm.php?p='. $user->secret .'&s='. $user->username;
    $messagehtml = text_to_html(get_string('emailconfirmation', '', $data), false, false, true);

    $user->mailformat = 1;  // Always send HTML version as well

    return email_to_user($user, $from, $subject, $message, $messagehtml);

}

/**
 * send_password_change_confirmation_email.
 *
 * @uses $CFG
 * @param user $user A {@link $USER} object
 * @return bool|string Returns "true" if mail was sent OK, "emailstop" if email
 *          was blocked by user and "false" if there was another sort of error.
 */
function send_password_change_confirmation_email($user) {

    global $CFG;

    $site = get_site();
    $from = get_admin();

    $data->firstname = $user->firstname;
    $data->sitename = $site->fullname;
    $data->link = $CFG->httpswwwroot .'/login/forgot_password.php?p='. $user->secret .'&s='. $user->username;
    $data->admin = fullname($from).' ('. $from->email .')';

    $message = get_string('emailpasswordconfirmation', '', $data);
    $subject = get_string('emailpasswordconfirmationsubject', '', $site->fullname);

    return email_to_user($user, $from, $subject, $message);

}

/**
 * Check that an email is allowed.  It returns an error message if there
 * was a problem.
 *
 * @uses $CFG
 * @param  string $email Content of email
 * @return string|false
 */
function email_is_not_allowed($email) {

    global $CFG;

    if (!empty($CFG->allowemailaddresses)) {
        $allowed = explode(' ', $CFG->allowemailaddresses);
        foreach ($allowed as $allowedpattern) {
            $allowedpattern = trim($allowedpattern);
            if (!$allowedpattern) {
                continue;
            }
            if (strpos($email, $allowedpattern) !== false) {  // Match!
                return false;
            }
        }
        return get_string('emailonlyallowed', '', $CFG->allowemailaddresses);

    } else if (!empty($CFG->denyemailaddresses)) {
        $denied = explode(' ', $CFG->denyemailaddresses);
        foreach ($denied as $deniedpattern) {
            $deniedpattern = trim($deniedpattern);
            if (!$deniedpattern) {
                continue;
            }
            if (strpos($email, $deniedpattern) !== false) {   // Match!
                return get_string('emailnotallowed', '', $CFG->denyemailaddresses);
            }
        }
    }

    return false;
}


/// FILE HANDLING  /////////////////////////////////////////////


/**
 * Makes an upload directory for a particular module.
 *
 * @uses $CFG
 * @param int $courseid The id of the course in question - maps to id field of 'course' table.
 * @return string|false Returns full path to directory if successful, false if not
 */
function make_mod_upload_directory($courseid) {
    global $CFG;

    if (! $moddata = make_upload_directory($courseid .'/'. $CFG->moddata)) {
        return false;
    }

    $strreadme = get_string('readme');

    if (file_exists($CFG->dirroot .'/lang/'. $CFG->lang .'/docs/module_files.txt')) {
        copy($CFG->dirroot .'/lang/'. $CFG->lang .'/docs/module_files.txt', $moddata .'/'. $strreadme .'.txt');
    } else {
        copy($CFG->dirroot .'/lang/en_utf8/docs/module_files.txt', $moddata .'/'. $strreadme .'.txt');
    }
    return $moddata;
}

/**
 * Returns current name of file on disk if it exists.
 *
 * @param string $newfile File to be verified
 * @return string Current name of file on disk if true
 */
function valid_uploaded_file($newfile) {
    if (empty($newfile)) {
        return '';
    }
    if (is_uploaded_file($newfile['tmp_name']) and $newfile['size'] > 0) {
        return $newfile['tmp_name'];
    } else {
        return '';
    }
}

/**
 * Returns the maximum size for uploading files.
 *
 * There are seven possible upload limits:
 * 1. in Apache using LimitRequestBody (no way of checking or changing this)
 * 2. in php.ini for 'upload_max_filesize' (can not be changed inside PHP)
 * 3. in .htaccess for 'upload_max_filesize' (can not be changed inside PHP)
 * 4. in php.ini for 'post_max_size' (can not be changed inside PHP)
 * 5. by the Moodle admin in $CFG->maxbytes
 * 6. by the teacher in the current course $course->maxbytes
 * 7. by the teacher for the current module, eg $assignment->maxbytes
 *
 * These last two are passed to this function as arguments (in bytes).
 * Anything defined as 0 is ignored.
 * The smallest of all the non-zero numbers is returned.
 *
 * @param int $sizebytes ?
 * @param int $coursebytes Current course $course->maxbytes (in bytes)
 * @param int $modulebytes Current module ->maxbytes (in bytes)
 * @return int The maximum size for uploading files.
 * @todo Finish documenting this function
 */
function get_max_upload_file_size($sitebytes=0, $coursebytes=0, $modulebytes=0) {

    if (! $filesize = ini_get('upload_max_filesize')) {
        $filesize = '5M';
    }
    $minimumsize = get_real_size($filesize);

    if ($postsize = ini_get('post_max_size')) {
        $postsize = get_real_size($postsize);
        if ($postsize < $minimumsize) {
            $minimumsize = $postsize;
        }
    }

    if ($sitebytes and $sitebytes < $minimumsize) {
        $minimumsize = $sitebytes;
    }

    if ($coursebytes and $coursebytes < $minimumsize) {
        $minimumsize = $coursebytes;
    }

    if ($modulebytes and $modulebytes < $minimumsize) {
        $minimumsize = $modulebytes;
    }

    return $minimumsize;
}

/**
 * Related to {@link get_max_upload_file_size()} - this function returns an
 * array of possible sizes in an array, translated to the
 * local language.
 *
 * @uses SORT_NUMERIC
 * @param int $sizebytes ?
 * @param int $coursebytes Current course $course->maxbytes (in bytes)
 * @param int $modulebytes Current module ->maxbytes (in bytes)
 * @return int
 * @todo Finish documenting this function
 */
function get_max_upload_sizes($sitebytes=0, $coursebytes=0, $modulebytes=0) {

    if (!$maxsize = get_max_upload_file_size($sitebytes, $coursebytes, $modulebytes)) {
        return array();
    }

    $filesize[$maxsize] = display_size($maxsize);

    $sizelist = array(10240, 51200, 102400, 512000, 1048576, 2097152,
                      5242880, 10485760, 20971520, 52428800, 104857600);

    foreach ($sizelist as $sizebytes) {
       if ($sizebytes < $maxsize) {
           $filesize[$sizebytes] = display_size($sizebytes);
       }
    }

    krsort($filesize, SORT_NUMERIC);

    return $filesize;
}

/**
 * If there has been an error uploading a file, print the appropriate error message
 * Numerical constants used as constant definitions not added until PHP version 4.2.0
 *
 * $filearray is a 1-dimensional sub-array of the $_FILES array
 * eg $filearray = $_FILES['userfile1']
 * If left empty then the first element of the $_FILES array will be used
 *
 * @uses $_FILES
 * @param array $filearray  A 1-dimensional sub-array of the $_FILES array
 * @param bool $returnerror If true then a string error message will be returned. Otherwise the user will be notified of the error in a notify() call.
 * @return bool|string
 */
function print_file_upload_error($filearray = '', $returnerror = false) {

    if ($filearray == '' or !isset($filearray['error'])) {

        if (empty($_FILES)) return false;

        $files = $_FILES; /// so we don't mess up the _FILES array for subsequent code
        $filearray = array_shift($files); /// use first element of array
    }

    switch ($filearray['error']) {

        case 0: // UPLOAD_ERR_OK
            if ($filearray['size'] > 0) {
                $errmessage = get_string('uploadproblem', $filearray['name']);
            } else {
                $errmessage = get_string('uploadnofilefound'); /// probably a dud file name
            }
            break;

        case 1: // UPLOAD_ERR_INI_SIZE
            $errmessage = get_string('uploadserverlimit');
            break;

        case 2: // UPLOAD_ERR_FORM_SIZE
            $errmessage = get_string('uploadformlimit');
            break;

        case 3: // UPLOAD_ERR_PARTIAL
            $errmessage = get_string('uploadpartialfile');
            break;

        case 4: // UPLOAD_ERR_NO_FILE
            $errmessage = get_string('uploadnofilefound');
            break;

        default:
            $errmessage = get_string('uploadproblem', $filearray['name']);
    }

    if ($returnerror) {
        return $errmessage;
    } else {
        notify($errmessage);
        return true;
    }

}

/**
 * handy function to loop through an array of files and resolve any filename conflicts
 * both in the array of filenames and for what is already on disk.
 * not really compatible with the similar function in uploadlib.php
 * but this could be used for files/index.php for moving files around.
 */

function resolve_filename_collisions($destination,$files,$format='%s_%d.%s') {
    foreach ($files as $k => $f) {
        if (check_potential_filename($destination,$f,$files)) {
            $bits = explode('.', $f);
            for ($i = 1; true; $i++) {
                $try = sprintf($format, $bits[0], $i, $bits[1]);
                if (!check_potential_filename($destination,$try,$files)) {
                    $files[$k] = $try;
                    break;
                }
            }
        }
    }
    return $files;
}

/**
 * @used by resolve_filename_collisions
 */
function check_potential_filename($destination,$filename,$files) {
    if (file_exists($destination.'/'.$filename)) {
        return true;
    }
    if (count(array_keys($files,$filename)) > 1) {
        return true;
    }
    return false;
}


/**
 * Returns an array with all the filenames in
 * all subdirectories, relative to the given rootdir.
 * If excludefile is defined, then that file/directory is ignored
 * If getdirs is true, then (sub)directories are included in the output
 * If getfiles is true, then files are included in the output
 * (at least one of these must be true!)
 *
 * @param string $rootdir  ?
 * @param string $excludefile  If defined then the specified file/directory is ignored
 * @param bool $descend  ?
 * @param bool $getdirs  If true then (sub)directories are included in the output
 * @param bool $getfiles  If true then files are included in the output
 * @return array An array with all the filenames in
 * all subdirectories, relative to the given rootdir
 * @todo Finish documenting this function. Add examples of $excludefile usage.
 */
function get_directory_list($rootdir, $excludefile='', $descend=true, $getdirs=false, $getfiles=true) {

    $dirs = array();

    if (!$getdirs and !$getfiles) {   // Nothing to show
        return $dirs;
    }

    if (!is_dir($rootdir)) {          // Must be a directory
        return $dirs;
    }

    if (!$dir = opendir($rootdir)) {  // Can't open it for some reason
        return $dirs;
    }

    while (false !== ($file = readdir($dir))) {
        $firstchar = substr($file, 0, 1);
        if ($firstchar == '.' or $file == 'CVS' or $file == $excludefile) {
            continue;
        }
        $fullfile = $rootdir .'/'. $file;
        if (filetype($fullfile) == 'dir') {
            if ($getdirs) {
                $dirs[] = $file;
            }
            if ($descend) {
                $subdirs = get_directory_list($fullfile, $excludefile, $descend, $getdirs, $getfiles);
                foreach ($subdirs as $subdir) {
                    $dirs[] = $file .'/'. $subdir;
                }
            }
        } else if ($getfiles) {
            $dirs[] = $file;
        }
    }
    closedir($dir);

    asort($dirs);

    return $dirs;
}


/**
 * Adds up all the files in a directory and works out the size.
 *
 * @param string $rootdir  ?
 * @param string $excludefile  ?
 * @return array
 * @todo Finish documenting this function
 */
function get_directory_size($rootdir, $excludefile='') {

    global $CFG;

    // do it this way if we can, it's much faster
    if (!empty($CFG->pathtodu) && is_executable(trim($CFG->pathtodu))) {
        $command = trim($CFG->pathtodu).' -sk --apparent-size '.escapeshellarg($rootdir);
        exec($command,$output,$return);
        if (is_array($output)) {
            return get_real_size(intval($output[0]).'k'); // we told it to return k.
        }
    }

    $size = 0;

    if (!is_dir($rootdir)) {          // Must be a directory
        return $dirs;
    }

    if (!$dir = @opendir($rootdir)) {  // Can't open it for some reason
        return $dirs;
    }

    while (false !== ($file = readdir($dir))) {
        $firstchar = substr($file, 0, 1);
        if ($firstchar == '.' or $file == 'CVS' or $file == $excludefile) {
            continue;
        }
        $fullfile = $rootdir .'/'. $file;
        if (filetype($fullfile) == 'dir') {
            $size += get_directory_size($fullfile, $excludefile);
        } else {
            $size += filesize($fullfile);
        }
    }
    closedir($dir);

    return $size;
}

/**
 * Converts numbers like 10M into bytes.
 *
 * @param mixed $size The size to be converted
 * @return mixed
 */
function get_real_size($size=0) {
    if (!$size) {
        return 0;
    }
    $scan['MB'] = 1048576;
    $scan['Mb'] = 1048576;
    $scan['M'] = 1048576;
    $scan['m'] = 1048576;
    $scan['KB'] = 1024;
    $scan['Kb'] = 1024;
    $scan['K'] = 1024;
    $scan['k'] = 1024;

    while (list($key) = each($scan)) {
        if ((strlen($size)>strlen($key))&&(substr($size, strlen($size) - strlen($key))==$key)) {
            $size = substr($size, 0, strlen($size) - strlen($key)) * $scan[$key];
            break;
        }
    }
    return $size;
}

/**
 * Converts bytes into display form
 *
 * @param string $size  ?
 * @return string
 * @staticvar string $gb Localized string for size in gigabytes
 * @staticvar string $mb Localized string for size in megabytes
 * @staticvar string $kb Localized string for size in kilobytes
 * @staticvar string $b Localized string for size in bytes
 * @todo Finish documenting this function. Verify return type.
 */
function display_size($size) {

    static $gb, $mb, $kb, $b;

    if (empty($gb)) {
        $gb = get_string('sizegb');
        $mb = get_string('sizemb');
        $kb = get_string('sizekb');
        $b  = get_string('sizeb');
    }

    if ($size >= 1073741824) {
        $size = round($size / 1073741824 * 10) / 10 . $gb;
    } else if ($size >= 1048576) {
        $size = round($size / 1048576 * 10) / 10 . $mb;
    } else if ($size >= 1024) {
        $size = round($size / 1024 * 10) / 10 . $kb;
    } else {
        $size = $size .' '. $b;
    }
    return $size;
}

/**
 * Cleans a given filename by removing suspicious or troublesome characters
 * Only these are allowed: alphanumeric _ - .
 * Unicode characters can be enabled by setting $CFG->unicodecleanfilename = true in config.php
 *
 * WARNING: unicode characters may not be compatible with zip compression in backup/restore,
 *          because native zip binaries do weird character conversions. Use PHP zipping instead.
 *
 * @param string $string  file name
 * @return string cleaned file name
 */
function clean_filename($string) {
    global $CFG;
    if (empty($CFG->unicodecleanfilename) || empty($CFG->unicodedb)) {
        $textlib = textlib_get_instance();
        $string = $textlib->specialtoascii($string, current_charset());
        $string = preg_replace('/[^\.a-zA-Z\d\_-]/','_', $string ); // only allowed chars
    } else {
        //clean only ascii range
        $string = preg_replace("/[\\000-\\x2c\\x2f\\x3a-\\x40\\x5b-\\x5e\\x60\\x7b-\\177]/s", '_', $string);
    }
    $string = preg_replace("/_+/", '_', $string);
    $string = preg_replace("/\.\.+/", '.', $string);
    return $string;
}


/// STRING TRANSLATION  ////////////////////////////////////////

/**
 * Returns the code for the current language
 *
 * @uses $CFG
 * @param $USER
 * @param $SESSION
 * @return string
 */
function current_language() {
    global $CFG, $USER, $SESSION;

    if (!empty($CFG->courselang)) {    // Course language can override all other settings for this page
        return $CFG->courselang;

    } else if (!empty($SESSION->lang)) {    // Session language can override other settings
        return $SESSION->lang;

    } else if (!empty($USER->lang)) {    // User language can override site language
        return $USER->lang;

    } else {
        return $CFG->lang;
    }
}

/* Return the code of the current charset
 * based in some config options and the lang being used
 * caching it per request.
 * @param $ignorecache to skip cached value and recalculate it again
 * @uses $CFG
 * @return string
 */
function current_charset($ignorecache = false) {

    global $CFG;

    static $currentcharset;

    if (!empty($currentcharset) and !$ignorecache) { /// Cached. Return it.
        return $currentcharset;
    }

    if (!empty($CFG->unicode) || !empty($CFG->unicodedb)) {
        $currentcharset = 'UTF-8';
    } else {
        $currentcharset = get_string('thischarset');
    }

    return $currentcharset;
}

/**
 * Prints out a translated string.
 *
 * Prints out a translated string using the return value from the {@link get_string()} function.
 *
 * Example usage of this function when the string is in the moodle.php file:

 * 
 * echo '';
 * print_string('wordforstudent');
 * echo '';
 * 
 *
 * Example usage of this function when the string is not in the moodle.php file:

 * 
 * echo '
';
 * print_string('typecourse', 'calendar');
 * echo '
';
 * 
 *
 * @param string $identifier The key identifier for the localized string
 * @param string $module The module where the key identifier is stored. If none is specified then moodle.php is used.
 * @param mixed $a An object, string or number that can be used
 * within translation strings
 */
function print_string($identifier, $module='', $a=NULL) {
    echo get_string($identifier, $module, $a);
}

/**
 * fix up the optional data in get_string()/print_string() etc
 * ensure possible sprintf() format characters are escaped correctly
 * needs to handle arbitrary strings and objects
 * @param mixed $a An object, string or number that can be used
 * @return mixed the supplied parameter 'cleaned'
 */
function clean_getstring_data( $a ) {
    if (is_string($a)) {
        return str_replace( '%','%%',$a );
    }
    elseif (is_object($a)) {
        $a_vars = get_object_vars( $a );
        $new_a_vars = array();
        foreach ($a_vars as $fname => $a_var) {
            $new_a_vars[$fname] = clean_getstring_data( $a_var );
        }
        return (object)$new_a_vars;
    }
    else {
        return $a;
    }
}

/**
 * Returns a localized string.
 *
 * Returns the translated string specified by $identifier as
 * for $module.  Uses the same format files as STphp.
 * $a is an object, string or number that can be used
 * within translation strings
 *
 * eg "hello \$a->firstname \$a->lastname"
 * or "hello \$a"
 *
 * If you would like to directly echo the localized string use
 * the function {@link print_string()}
 *
 * Example usage of this function involves finding the string you would
 * like a local equivalent of and using its identifier and module information
 * to retrive it.

 * If you open moodle/lang/en/moodle.php and look near line 1031
 * you will find a string to prompt a user for their word for student
 * 
 * $string['wordforstudent'] = 'Your word for Student';
 * 
 * So if you want to display the string 'Your word for student'
 * in any language that supports it on your site
 * you just need to use the identifier 'wordforstudent'
 * 
 * $mystring = ''. get_string('wordforstudent') .'';
or
 * 
 * If the string you want is in another file you'd take a slightly
 * different approach. Looking in moodle/lang/en/calendar.php you find
 * around line 75:
 * 
 * $string['typecourse'] = 'Course event';
 * 
 * If you want to display the string "Course event" in any language
 * supported you would use the identifier 'typecourse' and the module 'calendar'
 * (because it is in the file calendar.php):
 * 
 * $mystring = '
'. get_string('typecourse', 'calendar') .'
';
 * 
 *
 * As a last resort, should the identifier fail to map to a string
 * the returned string will be [[ $identifier ]]
 *
 * @uses $CFG
 * @param string $identifier The key identifier for the localized string
 * @param string $module The module where the key identifier is stored. If none is specified then moodle.php is used.
 * @param mixed $a An object, string or number that can be used
 * within translation strings
 * @return string The localized string.
 */
function get_string($identifier, $module='', $a=NULL) {

    global $CFG;

    global $course;     /// Not a nice hack, but quick
    if (empty($CFG->courselang)) {
        if (is_object($course) and isset($course->lang)) {
            $CFG->courselang = $course->lang;
        }
    }

/// Depending upon $CFG->unicodedb, we are going to check moodle.php or langconfig.php,
/// default to a different lang pack, and redefine the module for some special strings
/// that, under 1.6 lang packs, reside under langconfig.php
    $langconfigstrs = array('alphabet', 'backupnameformat', 'firstdayofweek', 'locale', 
                            'localewin', 'localewincharset', 'oldcharset',
                            'parentlanguage', 'strftimedate', 'strftimedateshort', 'strftimedatetime',
                            'strftimedaydate', 'strftimedaydatetime', 'strftimedayshort', 'strftimedaytime',
                            'strftimemonthyear', 'strftimerecent', 'strftimerecentfull', 'strftimetime',
                            'thischarset', 'thisdirection', 'thislanguage');

    if (!empty($CFG->unicodedb)) {
        $filetocheck = 'langconfig.php';
        $defaultlang = 'en_utf8';
        if (in_array($identifier, $langconfigstrs)) {
            $module = 'langconfig';  //This strings are under langconfig.php for 1.6 lang packs
        }
    } else {
        $filetocheck = 'moodle.php';
        $defaultlang = 'en';
    }

    $lang = current_language();

    if ($module == '') {
        $module = 'moodle';
    }

    // if $a happens to have % in it, double it so sprintf() doesn't break
    if ($a) {
        $a = clean_getstring_data( $a );
    }

/// Define the two or three major locations of language strings for this module

    if (isset($CFG->running_installer)) {
        $module = 'installer';
        $filetocheck = 'installer.php';
        $locations = array( $CFG->dirroot.'/install/lang/', $CFG->dataroot.'/lang/',  $CFG->dirroot.'/lang/' );
        $defaultlang = 'en_utf8';
    } else {
        $locations = array( $CFG->dataroot.'/lang/',  $CFG->dirroot.'/lang/' );
    }

    if ($module != 'moodle' && $module != 'langconfig') {
        if (strpos($module, 'block_') === 0) {  // It's a block lang file
            $locations[] =  $CFG->dirroot .'/blocks/'.substr($module, 6).'/lang/';
        } else if (strpos($module, 'report_') === 0) {  // It's a report lang file
            $locations[] =  $CFG->dirroot .'/admin/report/'.substr($module, 6).'/lang/';
            $locations[] =  $CFG->dirroot .'/course/report/'.substr($module, 6).'/lang/';
        } else {                                // It's a normal activity
            $locations[] =  $CFG->dirroot .'/mod/'.$module.'/lang/';
        }
    }

/// First check all the normal locations for the string in the current language
    foreach ($locations as $location) {
        $locallangfile = $location.$lang.'_local'.'/'.$module.'.php';    //first, see if there's a local file
        if (file_exists($locallangfile)) {
            if ($result = get_string_from_file($identifier, $locallangfile, "\$resultstring")) {
                eval($result);
                return $resultstring;
            }
        }
        //if local directory not found, or particular string does not exist in local direcotry
        $langfile = $location.$lang.'/'.$module.'.php';
        if (file_exists($langfile)) {
            if ($result = get_string_from_file($identifier, $langfile, "\$resultstring")) {
                eval($result);
                return $resultstring;
            }
        }
    }

/// If the preferred language was English (utf8) we can abort now
/// saving some checks beacuse it's the only "root" lang
    if ($lang == 'en_utf8') {
        return '[['. $identifier .']]';
    }

/// Is a parent language defined?  If so, try to find this string in a parent language file

    foreach ($locations as $location) {
        $langfile = $location.$lang.'/'.$filetocheck;
        if (file_exists($langfile)) {
            if ($result = get_string_from_file('parentlanguage', $langfile, "\$parentlang")) {
                eval($result);
                if (!empty($parentlang)) {   // found it!

                    //first, see if there's a local file for parent
                    $locallangfile = $location.$parentlang.'_local'.'/'.$module.'.php';
                    if (file_exists($locallangfile)) {
                        if ($result = get_string_from_file($identifier, $locallangfile, "\$resultstring")) {
                            eval($result);
                            return $resultstring;
                        }
                    }

                    //if local directory not found, or particular string does not exist in local direcotry
                    $langfile = $location.$parentlang.'/'.$module.'.php';
                    if (file_exists($langfile)) {
                        if ($result = get_string_from_file($identifier, $langfile, "\$resultstring")) {
                            eval($result);
                            return $resultstring;
                        }
                    }
                }
            }
        }
    }

/// Our only remaining option is to try English

    foreach ($locations as $location) {
        $locallangfile = $location.$defaultlang.'_local/'.$module.'.php';    //first, see if there's a local file
        if (file_exists($locallangfile)) {
            if ($result = get_string_from_file($identifier, $locallangfile, "\$resultstring")) {
                eval($result);
                return $resultstring;
            }
        }

        //if local_en not found, or string not found in local_en
        $langfile = $location.$defaultlang.'/'.$module.'.php';

        if (file_exists($langfile)) {
            if ($result = get_string_from_file($identifier, $langfile, "\$resultstring")) {
                eval($result);
                return $resultstring;
            }
        }
    }

/// And, because under 1.6 en is defined as en_utf8 child, me must try
/// if it hasn't been queried before.
    if ($defaultlang  == 'en') {
        $defaultlang = 'en_utf8';
        foreach ($locations as $location) {
            $locallangfile = $location.$defaultlang.'_local/'.$module.'.php';    //first, see if there's a local file
            if (file_exists($locallangfile)) {
                if ($result = get_string_from_file($identifier, $locallangfile, "\$resultstring")) {
                    eval($result);
                    return $resultstring;
                }
            }

            //if local_en not found, or string not found in local_en
            $langfile = $location.$defaultlang.'/'.$module.'.php';

            if (file_exists($langfile)) {
                if ($result = get_string_from_file($identifier, $langfile, "\$resultstring")) {
                    eval($result);
                    return $resultstring;
                }
            }
        }
    }

    return '[['.$identifier.']]';  // Last resort
}

/**
 * This function is only used from {@link get_string()}.
 *
 * @internal Only used from get_string, not meant to be public API
 * @param string $identifier ?
 * @param string $langfile ?
 * @param string $destination ?
 * @return string|false ?
 * @staticvar array $strings Localized strings
 * @access private
 * @todo Finish documenting this function.
 */
function get_string_from_file($identifier, $langfile, $destination) {

    static $strings;    // Keep the strings cached in memory.

    if (empty($strings[$langfile])) {
        $string = array();
        include ($langfile);
        $strings[$langfile] = $string;
    } else {
        $string = &$strings[$langfile];
    }

    if (!isset ($string[$identifier])) {
        return false;
    }

    return $destination .'= sprintf("'. $string[$identifier] .'");';
}

/**
 * Converts an array of strings to their localized value.
 *
 * @param array $array An array of strings
 * @param string $module The language module that these strings can be found in.
 * @return string
 */
function get_strings($array, $module='') {

   $string = NULL;
   foreach ($array as $item) {
       $string->$item = get_string($item, $module);
   }
   return $string;
}

/**
 * Returns a list of language codes and their full names
 * hides the _local files from everyone.
 * @uses $CFG
 * @return array An associative array with contents in the form of LanguageCode => LanguageName
 */
function get_list_of_languages() {

    global $CFG;

    $languages = array();

/// Depending upon $CFG->unicodedb, we are going to check moodle.php or langconfig.php
    if (!empty($CFG->unicodedb)) {
        $filetocheck = 'langconfig.php';
    } else {
        $filetocheck = 'moodle.php';
    }

    if ( (!defined('FULLME') || FULLME !== 'cron')
         && !empty($CFG->langcache) && file_exists($CFG->dataroot .'/cache/languages')) {
        // read from cache

        $lines = file($CFG->dataroot .'/cache/languages');
        foreach ($lines as $line) {
            $line = trim($line);
            if (preg_match('/^(\w+)\s+(.+)/', $line, $matches)) {
                $languages[$matches[1]] = $matches[2];
            }
        }
        unset($lines); unset($line); unset($matches);
        return $languages;
    }

    if (!empty($CFG->langlist)) {       // use admin's list of languages

        $langlist = explode(',', $CFG->langlist);
        foreach ($langlist as $lang) {
            $lang = trim($lang);   //Just trim spaces to be a bit more permissive
            if (strstr('_local',$lang)!==false) {
                continue;
            }
            if (substr($lang, -5) == '_utf8') {   //Remove the _utf8 suffix from the lang to show
                $shortlang = substr($lang, 0, -5);
            } else {
                $shortlang = $lang;
            }
        /// Search under dirroot/lang
        /// If $CFG->unicodedb = false, ignore new lang packs
            if (empty($CFG->unicodedb)) {
                if (file_exists($CFG->dirroot .'/lang/'. $lang .'/langconfig.php')) {
                    continue;
                }
            }
            if (file_exists($CFG->dirroot .'/lang/'. $lang .'/'. $filetocheck)) {
                include($CFG->dirroot .'/lang/'. $lang .'/'. $filetocheck);
                if (!empty($string['thislanguage'])) {
                    $languages[$lang] = $string['thislanguage'].' ('. $shortlang .')';
                }
                unset($string);
            }
        /// And moodledata/lang
        /// If $CFG->unicodedb = false, ignore new lang packs
            if (empty($CFG->unicodedb)) {
                if (file_exists($CFG->dataroot .'/lang/'. $lang .'/langconfig.php')) {
                    continue;
                }
            }
            if (file_exists($CFG->dataroot .'/lang/'. $lang .'/'. $filetocheck)) {
                include($CFG->dataroot .'/lang/'. $lang .'/'. $filetocheck);
                if (!empty($string['thislanguage'])) {
                    $languages[$lang] = $string['thislanguage'].' ('. $shortlang .')';
                }
                unset($string);
            }
        }
    } else {
    /// Fetch langs from moodle/lang directory
        $langdirs = get_list_of_plugins('lang');
    /// Fetch langs from moodledata/lang directory
        $langdirs2 = get_list_of_plugins('lang', '', $CFG->dataroot);
    /// Merge both lists of langs
        $langdirs = array_merge($langdirs, $langdirs2);
    /// Sort all
        asort($langdirs);
    /// Get some info from each lang (first from moodledata, then from moodle)
        foreach ($langdirs as $lang) {
            if (strstr('_local',$lang)!==false) {
                continue;
            }
            if (substr($lang, -5) == '_utf8') {   //Remove the _utf8 suffix from the lang to show
                $shortlang = substr($lang, 0, -5);
            } else {
                $shortlang = $lang;
            }
        /// Search under moodledata/lang
        /// If $CFG->unicodedb = false, ignore new lang packs
            if (empty($CFG->unicodedb)) {
                if (file_exists($CFG->dataroot .'/lang/'. $lang .'/langconfig.php')) {
                    continue;
                }
            }
            if (file_exists($CFG->dataroot .'/lang/'. $lang .'/'. $filetocheck)) {
                include($CFG->dataroot .'/lang/'. $lang .'/'. $filetocheck);
                if (!empty($string['thislanguage'])) {
                    $languages[$lang] = $string['thislanguage'] .' ('. $shortlang .')';
                }
                unset($string);
            }
        /// And dirroot/lang
        /// If $CFG->unicodedb = false, ignore new lang packs
            if (empty($CFG->unicodedb)) {
                if (file_exists($CFG->dirroot .'/lang/'. $lang .'/langconfig.php')) {
                    continue;
                }
            }
            if (file_exists($CFG->dirroot .'/lang/'. $lang .'/'. $filetocheck)) {
                include($CFG->dirroot .'/lang/'. $lang .'/'. $filetocheck);
                if (!empty($string['thislanguage'])) {
                    $languages[$lang] = $string['thislanguage'] .' ('. $shortlang .')';
                }
                unset($string);
            }
        }
    }

    if ( defined('FULLME') && FULLME === 'cron' && !empty($CFG->langcache)) {
        if ($file = fopen($CFG->dataroot .'/cache/languages', 'w')) {
            foreach ($languages as $key => $value) {
                fwrite($file, "$key $value\n");
            }
            fclose($file);
        }
    }

    return $languages;
}

/**
 * Returns a list of charset codes. It's hardcoded, so they should be added manually
 * (cheking that such charset is supported by the texlib library!)
 *
 * @return array And associative array with contents in the form of charset => charset
 */
function get_list_of_charsets() {

    $charsets = array(
        'EUC-JP'     => 'EUC-JP',
        'ISO-2022-JP'=> 'ISO-2022-JP',
        'ISO-8859-1' => 'ISO-8859-1',
        'SHIFT-JIS'  => 'SHIFT-JIS',
        'UTF-8'      => 'UTF-8');

    asort($charsets);

    return $charsets;
}

/**
 * Returns a list of country names in the current language
 *
 * @uses $CFG
 * @uses $USER
 * @return array
 */
function get_list_of_countries() {
    global $CFG, $USER;

    $lang = current_language();

    if (!empty($CFG->unicodedb)) {
        $defaultlang = 'en_utf8';
    } else {
        $defaultlang = 'en';
    }

    if (!file_exists($CFG->dirroot .'/lang/'. $lang .'/countries.php') &&
        !file_exists($CFG->dataroot.'/lang/'. $lang .'/countries.php')) {
        if ($parentlang = get_string('parentlanguage')) {
            if (file_exists($CFG->dirroot .'/lang/'. $parentlang .'/countries.php') ||
                file_exists($CFG->dataroot.'/lang/'. $parentlang .'/countries.php')) {
                $lang = $parentlang;
            } else {
                $lang = $defaultlang;  // countries.php must exist in this pack
            }
        } else {
            $lang = $defaultlang;  // countries.php must exist in this pack
        }
    }

    if (file_exists($CFG->dataroot .'/lang/'. $lang .'/countries.php')) {
        include($CFG->dataroot .'/lang/'. $lang .'/countries.php');
    } else if (file_exists($CFG->dirroot .'/lang/'. $lang .'/countries.php')) {
        include($CFG->dirroot .'/lang/'. $lang .'/countries.php');
    }

    if (!empty($string)) {
        asort($string);
    }

    return $string;
}

/**
 * Returns a list of valid and compatible themes
 *
 * @uses $CFG
 * @return array
 */
function get_list_of_themes() {

    global $CFG;

    $themes = array();

    if (!empty($CFG->themelist)) {       // use admin's list of themes
        $themelist = explode(',', $CFG->themelist);
    } else {
        $themelist = get_list_of_plugins("theme");
    }

    foreach ($themelist as $key => $theme) {
        if (!file_exists("$CFG->dirroot/theme/$theme/config.php")) {   // bad folder
            continue;
        }
        unset($THEME);    // Note this is not the global one!!  :-)
        include("$CFG->dirroot/theme/$theme/config.php");
        if (!isset($THEME->sheets)) {   // Not a valid 1.5 theme
            continue;
        }
        $themes[$theme] = $theme;
    }
    asort($themes);

    return $themes;
}


/**
 * Returns a list of picture names in the current language
 *
 * @uses $CFG
 * @return array
 */
function get_list_of_pixnames() {
    global $CFG;

    $lang = current_language();

    if (!file_exists($CFG->dirroot .'/lang/'. $lang .'/pix.php')) {
        if ($parentlang = get_string('parentlanguage')) {
            if (file_exists($CFG->dirroot .'/lang/'. $parentlang .'/pix.php')) {
                $lang = $parentlang;
            } else {
                $lang = 'en_utf8';  // pix.php must exist in this pack
            }
        } else {
            $lang = 'en_utf8';  // pix.php must exist in this pack
        }
    }

    include_once($CFG->dirroot .'/lang/'. $lang .'/pix.php');

    return $string;
}

/**
 * Returns a list of timezones in the current language
 *
 * @uses $CFG
 * @return array
 */
function get_list_of_timezones() {
    global $CFG;

    $timezones = array();

    if ($rawtimezones = get_records_sql('SELECT MAX(id), name FROM '.$CFG->prefix.'timezone GROUP BY name')) {
        foreach($rawtimezones as $timezone) {
            if (!empty($timezone->name)) {
                $timezones[$timezone->name] = get_string(strtolower($timezone->name), 'timezones');
                if (substr($timezones[$timezone->name], 0, 1) == '[') {  // No translation found
                    $timezones[$timezone->name] = $timezone->name;
                }
            }
        }
    }

    asort($timezones);

    for ($i = -13; $i <= 13; $i += .5) {
        $tzstring = 'GMT';
        if ($i < 0) {
            $timezones[sprintf("%.1f", $i)] = $tzstring . $i;
        } else if ($i > 0) {
            $timezones[sprintf("%.1f", $i)] = $tzstring . '+' . $i;
        } else {
            $timezones[sprintf("%.1f", $i)] = $tzstring;
        }
    }

    return $timezones;
}

/**
 * Returns a list of currencies in the current language
 *
 * @uses $CFG
 * @uses $USER
 * @return array
 */
function get_list_of_currencies() {
    global $CFG, $USER;

    $lang = current_language();

    if (!file_exists($CFG->dataroot .'/lang/'. $lang .'/currencies.php')) {
        if ($parentlang = get_string('parentlanguage')) {
            if (file_exists($CFG->dataroot .'/lang/'. $parentlang .'/currencies.php')) {
                $lang = $parentlang;
            } else {
                $lang = 'en_utf8';  // currencies.php must exist in this pack
            }
        } else {
            $lang = 'en_utf8';  // currencies.php must exist in this pack
        }
    }

    if (file_exists($CFG->dataroot .'/lang/'. $lang .'/currencies.php')) {
        include_once($CFG->dataroot .'/lang/'. $lang .'/currencies.php');
    } else {    //if en_utf8 is not installed in dataroot
        include_once($CFG->dirroot .'/lang/'. $lang .'/currencies.php');
    }

    if (!empty($string)) {
        asort($string);
    }

    return $string;
}



/**
 * Can include a given document file (depends on second
 * parameter) or just return info about it.
 *
 * @uses $CFG
 * @param string $file ?
 * @param bool $include ?
 * @return ?
 * @todo Finish documenting this function
 */
function document_file($file, $include=true) {
    global $CFG;

    $file = clean_filename($file);

    if (empty($file)) {
        return false;
    }

    $langs = array(current_language(), get_string('parentlanguage'), 'en');

    foreach ($langs as $lang) {
        $info->filepath = $CFG->dirroot .'/lang/'. $lang .'/docs/'. $file;
        $info->urlpath  = $CFG->wwwroot .'/lang/'. $lang .'/docs/'. $file;

        if (file_exists($info->filepath)) {
            if ($include) {
                include($info->filepath);
            }
            return $info;
        }
    }

    return false;
}

/**
 * Function to raise the memory limit to a new value.
 * Will respect the memory limit if it is higher, thus allowing
 * settings in php.ini, apache conf or command line switches
 * to override it
 *
 * The memory limit should be expressed with a string (eg:'64M')
 *
 * @param string $newlimit the new memory limit
 * @return bool
 */
function raise_memory_limit ($newlimit) {

    if (empty($newlimit)) {
        return false;
    }

    $cur = @ini_get('memory_limit');
    if (empty($cur)) {
        // if php is compiled without --enable-memory-limits
        // apparently memory_limit is set to ''
        $cur=0;
    } else {
        if ($cur == -1){
            return true; // unlimited mem!
        }
      $cur = get_real_size($cur);
    }

    $new = get_real_size($newlimit);
    if ($new > $cur) {
        ini_set('memory_limit', $newlimit);
        return true;
    }
    return false;
}

/// ENCRYPTION  ////////////////////////////////////////////////

/**
 * rc4encrypt
 *
 * @param string $data ?
 * @return string
 * @todo Finish documenting this function
 */
function rc4encrypt($data) {
    $password = 'nfgjeingjk';
    return endecrypt($password, $data, '');
}

/**
 * rc4decrypt
 *
 * @param string $data ?
 * @return string
 * @todo Finish documenting this function
 */
function rc4decrypt($data) {
    $password = 'nfgjeingjk';
    return endecrypt($password, $data, 'de');
}

/**
 * Based on a class by Mukul Sabharwal [mukulsabharwal @ yahoo.com]
 *
 * @param string $pwd ?
 * @param string $data ?
 * @param string $case ?
 * @return string
 * @todo Finish documenting this function
 */
function endecrypt ($pwd, $data, $case) {

    if ($case == 'de') {
        $data = urldecode($data);
    }

    $key[] = '';
    $box[] = '';
    $temp_swap = '';
    $pwd_length = 0;

    $pwd_length = strlen($pwd);

    for ($i = 0; $i <= 255; $i++) {
        $key[$i] = ord(substr($pwd, ($i % $pwd_length), 1));
        $box[$i] = $i;
    }

    $x = 0;

    for ($i = 0; $i <= 255; $i++) {
        $x = ($x + $box[$i] + $key[$i]) % 256;
        $temp_swap = $box[$i];
        $box[$i] = $box[$x];
        $box[$x] = $temp_swap;
    }

    $temp = '';
    $k = '';

    $cipherby = '';
    $cipher = '';

    $a = 0;
    $j = 0;

    for ($i = 0; $i < strlen($data); $i++) {
        $a = ($a + 1) % 256;
        $j = ($j + $box[$a]) % 256;
        $temp = $box[$a];
        $box[$a] = $box[$j];
        $box[$j] = $temp;
        $k = $box[(($box[$a] + $box[$j]) % 256)];
        $cipherby = ord(substr($data, $i, 1)) ^ $k;
        $cipher .= chr($cipherby);
    }

    if ($case == 'de') {
        $cipher = urldecode(urlencode($cipher));
    } else {
        $cipher = urlencode($cipher);
    }

    return $cipher;
}


/// CALENDAR MANAGEMENT  ////////////////////////////////////////////////////////////////


/**
 * Call this function to add an event to the calendar table
 *  and to call any calendar plugins
 *
 * @uses $CFG
 * @param array $event An associative array representing an event from the calendar table. The event will be identified by the id field. The object event should include the following:
 *  

 *    
$event->name - Name for the event
 *    
$event->description - Description of the event (defaults to '')
 *    
$event->format - Format for the description (using formatting types defined at the top of weblib.php)
 *    
$event->courseid - The id of the course this event belongs to (0 = all courses)
 *    
$event->groupid - The id of the group this event belongs to (0 = no group)
 *    
$event->userid - The id of the user this event belongs to (0 = no user)
 *    
$event->modulename - Name of the module that creates this event
 *    
$event->instance - Instance of the module that owns this event
 *    
$event->eventtype - The type info together with the module info could
 *             be used by calendar plugins to decide how to display event
 *    
$event->timestart- Timestamp for start of event
 *    
$event->timeduration - Duration (defaults to zero)
 *    
$event->visible - 0 if the event should be hidden (e.g. because the activity that created it is hidden)
 *  
 * @return int The id number of the resulting record
 */
 function add_event($event) {

    global $CFG;

    $event->timemodified = time();

    if (!$event->id = insert_record('event', $event)) {
        return false;
    }

    if (!empty($CFG->calendar)) { // call the add_event function of the selected calendar
        if (file_exists($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php')) {
            include_once($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php');
            $calendar_add_event = $CFG->calendar.'_add_event';
            if (function_exists($calendar_add_event)) {
                $calendar_add_event($event);
            }
        }
    }

    return $event->id;
}

/**
 * Call this function to update an event in the calendar table
 * the event will be identified by the id field of the $event object.
 *
 * @uses $CFG
 * @param array $event An associative array representing an event from the calendar table. The event will be identified by the id field.
 * @return bool
 */
function update_event($event) {

    global $CFG;

    $event->timemodified = time();

    if (!empty($CFG->calendar)) { // call the update_event function of the selected calendar
        if (file_exists($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php')) {
            include_once($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php');
            $calendar_update_event = $CFG->calendar.'_update_event';
            if (function_exists($calendar_update_event)) {
                $calendar_update_event($event);
            }
        }
    }
    return update_record('event', $event);
}

/**
 * Call this function to delete the event with id $id from calendar table.
 *
  * @uses $CFG
 * @param int $id The id of an event from the 'calendar' table.
 * @return array An associative array with the results from the SQL call.
 * @todo Verify return type
 */
function delete_event($id) {

    global $CFG;

    if (!empty($CFG->calendar)) { // call the delete_event function of the selected calendar
        if (file_exists($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php')) {
            include_once($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php');
            $calendar_delete_event = $CFG->calendar.'_delete_event';
            if (function_exists($calendar_delete_event)) {
                $calendar_delete_event($id);
            }
        }
    }
    return delete_records('event', 'id', $id);
}

/**
 * Call this function to hide an event in the calendar table
 * the event will be identified by the id field of the $event object.
 *
 * @uses $CFG
 * @param array $event An associative array representing an event from the calendar table. The event will be identified by the id field.
 * @return array An associative array with the results from the SQL call.
 * @todo Verify return type
 */
function hide_event($event) {
    global $CFG;

    if (!empty($CFG->calendar)) { // call the update_event function of the selected calendar
        if (file_exists($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php')) {
            include_once($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php');
            $calendar_hide_event = $CFG->calendar.'_hide_event';
            if (function_exists($calendar_hide_event)) {
                $calendar_hide_event($event);
            }
        }
    }
    return set_field('event', 'visible', 0, 'id', $event->id);
}

/**
 * Call this function to unhide an event in the calendar table
 * the event will be identified by the id field of the $event object.
 *
 * @uses $CFG
 * @param array $event An associative array representing an event from the calendar table. The event will be identified by the id field.
 * @return array An associative array with the results from the SQL call.
 * @todo Verify return type
 */
function show_event($event) {
    global $CFG;

    if (!empty($CFG->calendar)) { // call the update_event function of the selected calendar
        if (file_exists($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php')) {
            include_once($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php');
            $calendar_show_event = $CFG->calendar.'_show_event';
            if (function_exists($calendar_show_event)) {
                $calendar_show_event($event);
            }
        }
    }
    return set_field('event', 'visible', 1, 'id', $event->id);
}


/// ENVIRONMENT CHECKING  ////////////////////////////////////////////////////////////

/**
 * Lists plugin directories within some directory
 *
 * @uses $CFG
 * @param string $plugin dir under we'll look for plugins (defaults to 'mod')
 * @param string $exclude dir name to exclude from the list (defaults to none)
 * @param string $basedir full path to the base dir where $plugin resides (defaults to $CFG->dirroot)
 * @return array of plugins found under the requested parameters
 */
function get_list_of_plugins($plugin='mod', $exclude='', $basedir='') {

    global $CFG;

    $plugins = array();

    if (empty($basedir)) {
        $basedir = $CFG->dirroot .'/'. $plugin;
    } else {
        $basedir = $basedir .'/'. $plugin;
    }
    if (file_exists($basedir) && filetype($basedir) == 'dir') {
        $dirhandle = opendir($basedir);
        while (false !== ($dir = readdir($dirhandle))) {
            $firstchar = substr($dir, 0, 1);
            if ($firstchar == '.' or $dir == 'CVS' or $dir == '_vti_cnf' or $dir == $exclude) {
                continue;
            }
            if (filetype($basedir .'/'. $dir) != 'dir') {
                continue;
            }
            $plugins[] = $dir;
        }
        closedir($dirhandle);
    }
    if ($plugins) {
        asort($plugins);
    }
    return $plugins;
}

/**
 * Returns true if the current version of PHP is greater that the specified one.
 *
 * @param string $version The version of php being tested.
 * @return bool
 */
function check_php_version($version='4.1.0') {
    return (version_compare(phpversion(), $version) >= 0);
}


/**
 * Checks to see if is a browser matches the specified
 * brand and is equal or better version.
 *
 * @uses $_SERVER
 * @param string $brand The browser identifier being tested
 * @param int $version The version of the browser
 * @return bool
 */
 function check_browser_version($brand='MSIE', $version=5.5) {
    $agent = $_SERVER['HTTP_USER_AGENT'];

    if (empty($agent)) {
        return false;
    }

    switch ($brand) {

      case 'Gecko':   /// Gecko based browsers

          if (substr_count($agent, 'Camino')) {
              // MacOS X Camino support
              $version = 20041110;
          }

          // the proper string - Gecko/CCYYMMDD Vendor/Version
          // Faster version and work-a-round No IDN problem.
          if (preg_match("/Gecko\/([0-9]+)/i", $agent, $match)) {
              if ($match[1] > $version) {
                      return true;
                  }
              }
          break;


      case 'MSIE':   /// Internet Explorer

          if (strpos($agent, 'Opera')) {     // Reject Opera
              return false;
          }
          $string = explode(';', $agent);
          if (!isset($string[1])) {
              return false;
          }
          $string = explode(' ', trim($string[1]));
          if (!isset($string[0]) and !isset($string[1])) {
              return false;
          }
          if ($string[0] == $brand and (float)$string[1] >= $version ) {
              return true;
          }
          break;

    }

    return false;
}

/**
 * This function makes the return value of ini_get consistent if you are
 * setting server directives through the .htaccess file in apache.
 * Current behavior for value set from php.ini On = 1, Off = [blank]
 * Current behavior for value set from .htaccess On = On, Off = Off
 * Contributed by jdell @ unr.edu
 *
 * @param string $ini_get_arg ?
 * @return bool
 * @todo Finish documenting this function
 */
function ini_get_bool($ini_get_arg) {
    $temp = ini_get($ini_get_arg);

    if ($temp == '1' or strtolower($temp) == 'on') {
        return true;
    }
    return false;
}

/**
 * Compatibility stub to provide backward compatibility
 *
 * Determines if the HTML editor is enabled.
 * @deprecated Use {@link can_use_html_editor()} instead.
 */
 function can_use_richtext_editor() {
    return can_use_html_editor();
}

/**
 * Determines if the HTML editor is enabled.
 *
 * This depends on site and user
 * settings, as well as the current browser being used.
 *
 * @return string|false Returns false if editor is not being used, otherwise
 * returns 'MSIE' or 'Gecko'.
 */
 function can_use_html_editor() {
    global $USER, $CFG;

    if (!empty($USER->htmleditor) and !empty($CFG->htmleditor)) {
        if (check_browser_version('MSIE', 5.5)) {
            return 'MSIE';
        } else if (check_browser_version('Gecko', 20030516)) {
            return 'Gecko';
        }
    }
    return false;
}

/**
 * Hack to find out the GD version by parsing phpinfo output
 *
 * @return int GD version (1, 2, or 0)
 */
function check_gd_version() {
    $gdversion = 0;

    if (function_exists('gd_info')){
        $gd_info = gd_info();
        if (substr_count($gd_info['GD Version'], '2.')) {
            $gdversion = 2;
        } else if (substr_count($gd_info['GD Version'], '1.')) {
            $gdversion = 1;
        }

    } else {
        ob_start();
        phpinfo(8);
        $phpinfo = ob_get_contents();
        ob_end_clean();

        $phpinfo = explode("\n", $phpinfo);


        foreach ($phpinfo as $text) {
            $parts = explode('', $text);
            foreach ($parts as $key => $val) {
                $parts[$key] = trim(strip_tags($val));
            }
            if ($parts[0] == 'GD Version') {
                if (substr_count($parts[1], '2.0')) {
                    $parts[1] = '2.0';
                }
                $gdversion = intval($parts[1]);
            }
        }
    }

    return $gdversion;   // 1, 2 or 0
}

/**
 * Determine if moodle installation requires update
 *
 * Checks version numbers of main code and all modules to see
 * if there are any mismatches
 *
 * @uses $CFG
 * @return bool
 */
function moodle_needs_upgrading() {
    global $CFG;

    include_once($CFG->dirroot .'/version.php');  # defines $version and upgrades
    if ($CFG->version) {
        if ($version > $CFG->version) {
            return true;
        }
        if ($mods = get_list_of_plugins('mod')) {
            foreach ($mods as $mod) {
                $fullmod = $CFG->dirroot .'/mod/'. $mod;
                unset($module);
                if (!is_readable($fullmod .'/version.php')) {
                    notify('Module "'. $mod .'" is not readable - check permissions');
                    continue;
                }
                include_once($fullmod .'/version.php');  # defines $module with version etc
                if ($currmodule = get_record('modules', 'name', $mod)) {
                    if ($module->version > $currmodule->version) {
                        return true;
                    }
                }
            }
        }
    } else {
        return true;
    }
    return false;
}


/// MISCELLANEOUS ////////////////////////////////////////////////////////////////////

/**
 * Notify admin users or admin user of any failed logins (since last notification).
 *
 * @uses $CFG
 * @uses $db
 * @uses HOURSECS
 */
function notify_login_failures() {
    global $CFG, $db;

    switch ($CFG->notifyloginfailures) {
        case 'mainadmin' :
            $recip = array(get_admin());
            break;
        case 'alladmins':
            $recip = get_admins();
            break;
    }

    if (empty($CFG->lastnotifyfailure)) {
        $CFG->lastnotifyfailure=0;
    }

    // we need to deal with the threshold stuff first.
    if (empty($CFG->notifyloginthreshold)) {
        $CFG->notifyloginthreshold = 10; // default to something sensible.
    }

    $notifyipsrs = $db->Execute('SELECT ip FROM '. $CFG->prefix .'log WHERE time > '. $CFG->lastnotifyfailure .'
                          AND module=\'login\' AND action=\'error\' GROUP BY ip HAVING count(*) > '. $CFG->notifyloginthreshold);

    $notifyusersrs = $db->Execute('SELECT info FROM '. $CFG->prefix .'log WHERE time > '. $CFG->lastnotifyfailure .'
                          AND module=\'login\' AND action=\'error\' GROUP BY info HAVING count(*) > '. $CFG->notifyloginthreshold);

    if ($notifyipsrs) {
        $ipstr = '';
        while ($row = $notifyipsrs->FetchRow()) {
            $ipstr .= "'". $row['ip'] ."',";
        }
        $ipstr = substr($ipstr,0,strlen($ipstr)-1);
    }
    if ($notifyusersrs) {
        $userstr = '';
        while ($row = $notifyusersrs->FetchRow()) {
            $userstr .= "'". $row['info'] ."',";
        }
        $userstr = substr($userstr,0,strlen($userstr)-1);
    }

    if (strlen($userstr) > 0 || strlen($ipstr) > 0) {
        $count = 0;
        $logs = get_logs('time > '. $CFG->lastnotifyfailure .' AND module=\'login\' AND action=\'error\' '
                 .((strlen($ipstr) > 0 && strlen($userstr) > 0) ? ' AND ( ip IN ('. $ipstr .') OR info IN ('. $userstr .') ) '
                 : ((strlen($ipstr) != 0) ? ' AND ip IN ('. $ipstr .') ' : ' AND info IN ('. $userstr .') ')), 'l.time DESC', '', '', $count);

        // if we haven't run in the last hour and we have something useful to report and we are actually supposed to be reporting to somebody
        if (is_array($recip) and count($recip) > 0 and ((time() - HOURSECS) > $CFG->lastnotifyfailure)
            and is_array($logs) and count($logs) > 0) {

            $message = '';
            $site = get_site();
            $subject = get_string('notifyloginfailuressubject', '', $site->fullname);
            $message .= get_string('notifyloginfailuresmessagestart', '', $CFG->wwwroot)
                 .(($CFG->lastnotifyfailure != 0) ? '('.userdate($CFG->lastnotifyfailure).')' : '')."\n\n";
            foreach ($logs as $log) {
                $log->time = userdate($log->time);
                $message .= get_string('notifyloginfailuresmessage','',$log)."\n";
            }
            $message .= "\n\n".get_string('notifyloginfailuresmessageend','',$CFG->wwwroot)."\n\n";
            foreach ($recip as $admin) {
                mtrace('Emailing '. $admin->username .' about '. count($logs) .' failed login attempts');
                email_to_user($admin,get_admin(),$subject,$message);
            }
            $conf->name = 'lastnotifyfailure';
            $conf->value = time();
            if ($current = get_record('config', 'name', 'lastnotifyfailure')) {
                $conf->id = $current->id;
                if (! update_record('config', $conf)) {
                    mtrace('Could not update last notify time');
                }

            } else if (! insert_record('config', $conf)) {
                mtrace('Could not set last notify time');
            }
        }
    }
}

/**
 * moodle_setlocale
 *
 * @uses $CFG
 * @uses $USER
 * @uses $SESSION
 * @param string $locale ?
 * @todo Finish documenting this function
 */
function moodle_setlocale($locale='') {

    global $SESSION, $USER, $CFG;

/// Fetch the correct locale based on ostype
    if(!empty($CFG->unicodedb) && $CFG->ostype == 'WINDOWS') {
        $stringtofetch = 'localewin';
    } else {
        $stringtofetch = 'locale';
    }

    if ($locale) {
        $CFG->locale = $locale;
    } else if (!empty($CFG->courselang) and ($CFG->courselang != $CFG->lang) ) {
        $CFG->locale = get_string($stringtofetch);
    } else if (!empty($SESSION->lang) and ($SESSION->lang != $CFG->lang) ) {
        $CFG->locale = get_string($stringtofetch);
    } else if (!empty($USER->lang) and ($USER->lang != $CFG->lang) ) {
        $CFG->locale = get_string($stringtofetch);
    } else if (empty($CFG->locale)) {
        $CFG->locale = get_string($stringtofetch);
        if (!get_field('config', 'value', 'name', 'locale')) {  // Make SURE there isn't one already
            set_config('locale', $CFG->locale);                 // Cache it to save lookups in future
        }
    }

/// Due to some strange BUG we cannot set the LC_TIME directly, so we fetch current values,
/// set LC_ALL and then set values again. Just wondering why we cannot set LC_ALL only??? - stronk7
/// Some day, numeric, monetary and other categories should be set too, I think. :-/

/// Get current values
    $monetary= setlocale (LC_MONETARY, 0);
    $numeric = setlocale (LC_NUMERIC, 0);
    $ctype   = setlocale (LC_CTYPE, 0);
    if ($CFG->ostype != 'WINDOWS') {
        $messages= setlocale (LC_MESSAGES, 0);
    }
/// Set locale to all
    setlocale (LC_ALL, $CFG->locale);
/// Set old values
    setlocale (LC_MONETARY, $monetary);
    setlocale (LC_NUMERIC, $numeric);
    if ($CFG->ostype != 'WINDOWS') {
        setlocale (LC_MESSAGES, $messages);
    }
    if ($CFG->locale == 'tr_TR') {            // To workaround a well-known PHP bug with Turkish
        setlocale (LC_CTYPE, $ctype);
    }
}

/**
 * Converts string to lowercase using most compatible function available.
 *
 * @param string $string The string to convert to all lowercase characters.
 * @param string $encoding The encoding on the string.
 * @return string
 * @todo Add examples of calling this function with/without encoding types
 */
function moodle_strtolower ($string, $encoding='') {
    if (function_exists('mb_strtolower')) {
        if($encoding===''){
           return mb_strtolower($string);          //use multibyte support with default encoding
        } else {
           return mb_strtolower($string, $encoding); //use given encoding
        }
    } else {
        return strtolower($string);                // use common function what rely on current locale setting
    }
}

/**
 * Count words in a string.
 *
 * Words are defined as things between whitespace.
 *
 * @param string $string The text to be searched for words.
 * @return int The count of words in the specified string
 */
function count_words($string) {
    $string = strip_tags($string);
    return count(preg_split("/\w\b/", $string)) - 1;
}

/** Count letters in a string.
 *
 * Letters are defined as chars not in tags and different from whitespace.
 *
 * @param string $string The text to be searched for letters.
 * @return int The count of letters in the specified text.
 */
function count_letters($string) {
/// Loading the textlib singleton instance. We are going to need it.
    $textlib = textlib_get_instance();

    $string = strip_tags($string); // Tags are out now
    $string = ereg_replace('[[:space:]]*','',$string); //Whitespace are out now

    return $textlib->strlen($string, current_charset());
}

/**
 * Generate and return a random string of the specified length.
 *
 * @param int $length The length of the string to be created.
 * @return string
 */
function random_string ($length=15) {
    $pool  = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $pool .= 'abcdefghijklmnopqrstuvwxyz';
    $pool .= '0123456789';
    $poollen = strlen($pool);
    mt_srand ((double) microtime() * 1000000);
    $string = '';
    for ($i = 0; $i < $length; $i++) {
        $string .= substr($pool, (mt_rand()%($poollen)), 1);
    }
    return $string;
}

/*
 * Given some text (which may contain HTML) and an ideal length,
 * this function truncates the text neatly on a word boundary if possible
 */
function shorten_text($text, $ideal=30) {

   global $CFG;


   $i = 0;
   $tag = false;
   $length = strlen($text);
   $count = 0;
   $stopzone = false;
   $truncate = 0;

   if ($length <= $ideal) {
       return $text;
   }

   for ($i=0; $i<$length; $i++) {
       $char = $text[$i];

       switch ($char) {
           case "<":
               $tag = true;
               break;
           case ">":
               $tag = false;
               break;
           default:
               if (!$tag) {
                   if ($stopzone) {
                       if ($char == '.' or $char == ' ') {
                           $truncate = $i+1;
                           break 2;
                       }
                   }
                   $count++;
               }
               break;
       }
       if (!$stopzone) {
           if ($count > $ideal) {
               $stopzone = true;
           }
       }
   }

   if (!$truncate) {
       $truncate = $i;
   }

   $ellipse = ($truncate < $length) ? '...' : '';

   return substr($text, 0, $truncate).$ellipse;
}


/**
 * Given dates in seconds, how many weeks is the date from startdate
 * The first week is 1, the second 2 etc ...
 *
 * @uses WEEKSECS
 * @param ? $startdate ?
 * @param ? $thedate ?
 * @return string
 * @todo Finish documenting this function
 */
function getweek ($startdate, $thedate) {
    if ($thedate < $startdate) {   // error
        return 0;
    }

    return floor(($thedate - $startdate) / WEEKSECS) + 1;
}

/**
 * returns a randomly generated password of length $maxlen.  inspired by
 * {@link http://www.phpbuilder.com/columns/jesus19990502.php3}
 *
 * @param int $maxlength  The maximum size of the password being generated.
 * @return string
 */
function generate_password($maxlen=10) {
    global $CFG;

    $fillers = '1234567890!$-+';
    $wordlist = file($CFG->wordlist);

    srand((double) microtime() * 1000000);
    $word1 = trim($wordlist[rand(0, count($wordlist) - 1)]);
    $word2 = trim($wordlist[rand(0, count($wordlist) - 1)]);
    $filler1 = $fillers[rand(0, strlen($fillers) - 1)];

    return substr($word1 . $filler1 . $word2, 0, $maxlen);
}

/**
 * Given a float, prints it nicely
 *
 * @param float $num The float to print
 * @param int $places The number of decimal places to print.
 * @return string
 */
function format_float($num, $places=1) {
    return sprintf("%.$places"."f", $num);
}

/**
 * Given a simple array, this shuffles it up just like shuffle()
 * Unlike PHP's shuffle() ihis function works on any machine.
 *
 * @param array $array The array to be rearranged
 * @return array
 */
function swapshuffle($array) {

    srand ((double) microtime() * 10000000);
    $last = count($array) - 1;
    for ($i=0;$i<=$last;$i++) {
        $from = rand(0,$last);
        $curr = $array[$i];
        $array[$i] = $array[$from];
        $array[$from] = $curr;
    }
    return $array;
}

/**
 * Like {@link swapshuffle()}, but works on associative arrays
 *
 * @param array $array The associative array to be rearranged
 * @return array
 */
function swapshuffle_assoc($array) {
///

    $newkeys = swapshuffle(array_keys($array));
    foreach ($newkeys as $newkey) {
        $newarray[$newkey] = $array[$newkey];
    }
    return $newarray;
}

/**
 * Given an arbitrary array, and a number of draws,
 * this function returns an array with that amount
 * of items.  The indexes are retained.
 *
 * @param array $array ?
 * @param ? $draws ?
 * @return ?
 * @todo Finish documenting this function
 */
function draw_rand_array($array, $draws) {
    srand ((double) microtime() * 10000000);

    $return = array();

    $last = count($array);

    if ($draws > $last) {
        $draws = $last;
    }

    while ($draws > 0) {
        $last--;

        $keys = array_keys($array);
        $rand = rand(0, $last);

        $return[$keys[$rand]] = $array[$keys[$rand]];
        unset($array[$keys[$rand]]);

        $draws--;
    }

    return $return;
}

/**
 * microtime_diff
 *
 * @param string $a ?
 * @param string $b ?
 * @return string
 * @todo Finish documenting this function
 */
function microtime_diff($a, $b) {
    list($a_dec, $a_sec) = explode(' ', $a);
    list($b_dec, $b_sec) = explode(' ', $b);
    return $b_sec - $a_sec + $b_dec - $a_dec;
}

/**
 * Given a list (eg a,b,c,d,e) this function returns
 * an array of 1->a, 2->b, 3->c etc
 *
 * @param array $list ?
 * @param string $separator ?
 * @todo Finish documenting this function
 */
function make_menu_from_list($list, $separator=',') {

    $array = array_reverse(explode($separator, $list), true);
    foreach ($array as $key => $item) {
        $outarray[$key+1] = trim($item);
    }
    return $outarray;
}

/**
 * Creates an array that represents all the current grades that
 * can be chosen using the given grading type.  Negative numbers
 * are scales, zero is no grade, and positive numbers are maximum
 * grades.
 *
 * @param int $gradingtype ?
 * return int
 * @todo Finish documenting this function
 */
function make_grades_menu($gradingtype) {
    $grades = array();
    if ($gradingtype < 0) {
        if ($scale = get_record('scale', 'id', - $gradingtype)) {
            return make_menu_from_list($scale->scale);
        }
    } else if ($gradingtype > 0) {
        for ($i=$gradingtype; $i>=0; $i--) {
            $grades[$i] = $i .' / '. $gradingtype;
        }
        return $grades;
    }
    return $grades;
}

/**
 * This function returns the nummber of activities
 * using scaleid in a courseid
 *
 * @param int $courseid ?
 * @param int $scaleid ?
 * @return int
 * @todo Finish documenting this function
 */
function course_scale_used($courseid, $scaleid) {

    global $CFG;

    $return = 0;

    if (!empty($scaleid)) {
        if ($cms = get_course_mods($courseid)) {
            foreach ($cms as $cm) {
                //Check cm->name/lib.php exists
                if (file_exists($CFG->dirroot.'/mod/'.$cm->modname.'/lib.php')) {
                    include_once($CFG->dirroot.'/mod/'.$cm->modname.'/lib.php');
                    $function_name = $cm->modname.'_scale_used';
                    if (function_exists($function_name)) {
                        if ($function_name($cm->instance,$scaleid)) {
                            $return++;
                        }
                    }
                }
            }
        }
    }
    return $return;
}

/**
 * This function returns the nummber of activities
 * using scaleid in the entire site
 *
 * @param int $scaleid ?
 * @return int
 * @todo Finish documenting this function. Is return type correct?
 */
function site_scale_used($scaleid,&$courses) {

    global $CFG;

    $return = 0;

    if (!is_array($courses) || count($courses) == 0) {
        $courses = get_courses("all",false,"c.id,c.shortname");
    }

    if (!empty($scaleid)) {
        if (is_array($courses) && count($courses) > 0) {
            foreach ($courses as $course) {
                $return += course_scale_used($course->id,$scaleid);
            }
        }
    }
    return $return;
}

/**
 * make_unique_id_code
 *
 * @param string $extra ?
 * @return string
 * @todo Finish documenting this function
 */
function make_unique_id_code($extra='') {

    $hostname = 'unknownhost';
    if (!empty($_SERVER['HTTP_HOST'])) {
        $hostname = $_SERVER['HTTP_HOST'];
    } else if (!empty($_ENV['HTTP_HOST'])) {
        $hostname = $_ENV['HTTP_HOST'];
    } else if (!empty($_SERVER['SERVER_NAME'])) {
        $hostname = $_SERVER['SERVER_NAME'];
    } else if (!empty($_ENV['SERVER_NAME'])) {
        $hostname = $_ENV['SERVER_NAME'];
    }

    $date = gmdate("ymdHis");

    $random =  random_string(6);

    if ($extra) {
        return $hostname .'+'. $date .'+'. $random .'+'. $extra;
    } else {
        return $hostname .'+'. $date .'+'. $random;
    }
}


/**
 * Function to check the passed address is within the passed subnet
 *
 * The parameter is a comma separated string of subnet definitions.
 * Subnet strings can be in one of two formats:
 *   1: xxx.xxx.xxx.xxx/xx
 *   2: xxx.xxx
 * Code for type 1 modified from user posted comments by mediator at
 * {@link http://au.php.net/manual/en/function.ip2long.php}
 *
 * @param string $addr    The address you are checking
 * @param string $subnetstr    The string of subnet addresses
 * @return bool
 */
function address_in_subnet($addr, $subnetstr) {

    $subnets = explode(',', $subnetstr);
    $found = false;
    $addr = trim($addr);

    foreach ($subnets as $subnet) {
        $subnet = trim($subnet);
        if (strpos($subnet, '/') !== false) { /// type 1

            list($ip, $mask) = explode('/', $subnet);
            $mask = 0xffffffff << (32 - $mask);
            $found = ((ip2long($addr) & $mask) == (ip2long($ip) & $mask));

        } else { /// type 2
            $found = (strpos($addr, $subnet) === 0);
        }

        if ($found) {
            break;
        }
    }

    return $found;
}

/**
 * This function sets the $HTTPSPAGEREQUIRED global
 * (used in some parts of moodle to change some links)
 * and calculate the proper wwwroot to be used
 *
 * By using this function properly, we can ensure 100% https-ized pages
 * at our entire discretion (login, forgot_password, change_password)
 */
function httpsrequired() {

    global $CFG, $HTTPSPAGEREQUIRED;

    if (!empty($CFG->loginhttps)) {
        $HTTPSPAGEREQUIRED = true;
        $CFG->httpswwwroot = str_replace('http:', 'https:', $CFG->wwwroot);
    } else {
        $CFG->httpswwwroot = $CFG->wwwroot;
    }
}

/**
 * For outputting debugging info
 *
 * @uses STDOUT
 * @param string $string ?
 * @param string $eol ?
 * @todo Finish documenting this function
 */
function mtrace($string, $eol="\n", $sleep=0) {

    if (defined('STDOUT')) {
        fwrite(STDOUT, $string.$eol);
    } else {
        echo $string . $eol;
    }

    flush();

    //delay to keep message on user's screen in case of subsequent redirect
    if ($sleep) {
        sleep($sleep);
    }
}

//Replace 1 or more slashes or backslashes to 1 slash
function cleardoubleslashes ($path) {
    return preg_replace('/(\/|\\\){1,}/','/',$path);
}

function zip_files ($originalfiles, $destination) {
//Zip an array of files/dirs to a destination zip file
//Both parameters must be FULL paths to the files/dirs

    global $CFG;

    //Extract everything from destination
    $path_parts = pathinfo(cleardoubleslashes($destination));
    $destpath = $path_parts["dirname"];       //The path of the zip file
    $destfilename = $path_parts["basename"];  //The name of the zip file
    $extension = $path_parts["extension"];    //The extension of the file

    //If no file, error
    if (empty($destfilename)) {
        return false;
    }

    //If no extension, add it
    if (empty($extension)) {
        $extension = 'zip';
        $destfilename = $destfilename.'.'.$extension;
    }

    //Check destination path exists
    if (!is_dir($destpath)) {
        return false;
    }

    //Check destination path is writable. TODO!!

    //Clean destination filename
    $destfilename = clean_filename($destfilename);

    //Now check and prepare every file
    $files = array();
    $origpath = NULL;

    foreach ($originalfiles as $file) {  //Iterate over each file
        //Check for every file
        $tempfile = cleardoubleslashes($file); // no doubleslashes!
        //Calculate the base path for all files if it isn't set
        if ($origpath === NULL) {
            $origpath = rtrim(cleardoubleslashes(dirname($tempfile)), "/");
        }
        //See if the file is readable
        if (!is_readable($tempfile)) {  //Is readable
            continue;
        }
        //See if the file/dir is in the same directory than the rest
        if (rtrim(cleardoubleslashes(dirname($tempfile)), "/") != $origpath) {
            continue;
        }
        //Add the file to the array
        $files[] = $tempfile;
    }

    //Everything is ready:
    //    -$origpath is the path where ALL the files to be compressed reside (dir).
    //    -$destpath is the destination path where the zip file will go (dir).
    //    -$files is an array of files/dirs to compress (fullpath)
    //    -$destfilename is the name of the zip file (without path)

    //print_object($files);                  //Debug

    if (empty($CFG->zip)) {    // Use built-in php-based zip function

        include_once("$CFG->libdir/pclzip/pclzip.lib.php");
        $archive = new PclZip(cleardoubleslashes("$destpath/$destfilename"));
        if (($list = $archive->create($files, PCLZIP_OPT_REMOVE_PATH,$origpath) == 0)) {
            notice($archive->errorInfo(true));
            return false;
        }

    } else {                   // Use external zip program

        $filestozip = "";
        foreach ($files as $filetozip) {
            $filestozip .= escapeshellarg(basename($filetozip));
            $filestozip .= " ";
        }
        //Construct the command
        $separator = strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' ? ' &' : ' ;';
        $command = 'cd '.escapeshellarg($origpath).$separator.
                    escapeshellarg($CFG->zip).' -r '.
                    escapeshellarg(cleardoubleslashes("$destpath/$destfilename")).' '.$filestozip;
        //All converted to backslashes in WIN
        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
            $command = str_replace('/','\\',$command);
        }
        Exec($command);
    }
    return true;
}

function unzip_file ($zipfile, $destination = '', $showstatus = true) {
//Unzip one zip file to a destination dir
//Both parameters must be FULL paths
//If destination isn't specified, it will be the
//SAME directory where the zip file resides.

    global $CFG;

    //Extract everything from zipfile
    $path_parts = pathinfo(cleardoubleslashes($zipfile));
    $zippath = $path_parts["dirname"];       //The path of the zip file
    $zipfilename = $path_parts["basename"];  //The name of the zip file
    $extension = $path_parts["extension"];    //The extension of the file

    //If no file, error
    if (empty($zipfilename)) {
        return false;
    }

    //If no extension, error
    if (empty($extension)) {
        return false;
    }

    //Clear $zipfile
    $zipfile = cleardoubleslashes($zipfile);

    //Check zipfile exists
    if (!file_exists($zipfile)) {
        return false;
    }

    //If no destination, passed let's go with the same directory
    if (empty($destination)) {
        $destination = $zippath;
    }

    //Clear $destination
    $destpath = rtrim(cleardoubleslashes($destination), "/");

    //Check destination path exists
    if (!is_dir($destpath)) {
        return false;
    }

    //Check destination path is writable. TODO!!

    //Everything is ready:
    //    -$zippath is the path where the zip file resides (dir)
    //    -$zipfilename is the name of the zip file (without path)
    //    -$destpath is the destination path where the zip file will uncompressed (dir)

    if (empty($CFG->unzip)) {    // Use built-in php-based unzip function

        include_once("$CFG->libdir/pclzip/pclzip.lib.php");
        $archive = new PclZip(cleardoubleslashes("$zippath/$zipfilename"));
        if (!$list = $archive->extract(PCLZIP_OPT_PATH, $destpath,
                                       PCLZIP_CB_PRE_EXTRACT, 'unzip_cleanfilename')) {
            notice($archive->errorInfo(true));
            return false;
        }

    } else {                     // Use external unzip program

        $separator = strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' ? ' &' : ' ;';
        $redirection = strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' ? '' : ' 2>&1';

        $command = 'cd '.escapeshellarg($zippath).$separator.
                    escapeshellarg($CFG->unzip).' -o '.
                    escapeshellarg(cleardoubleslashes("$zippath/$zipfilename")).' -d '.
                    escapeshellarg($destpath).$redirection;
        //All converted to backslashes in WIN
        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
            $command = str_replace('/','\\',$command);
        }
        Exec($command,$list);
    }

    //Display some info about the unzip execution
    if ($showstatus) {
        unzip_show_status($list,$destpath);
    }

    return true;
}

function unzip_cleanfilename ($p_event, &$p_header) {
//This function is used as callback in unzip_file() function
//to clean illegal characters for given platform and to prevent directory traversal.
//Produces the same result as info-zip unzip.
    $p_header['filename'] = ereg_replace('[[:cntrl:]]', '', $p_header['filename']); //strip control chars first!
    $p_header['filename'] = ereg_replace('\.\.+', '', $p_header['filename']); //directory traversal protection
    if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
        $p_header['filename'] = ereg_replace('[:*"?<>|]', '_', $p_header['filename']); //replace illegal chars
        $p_header['filename'] = ereg_replace('^([a-zA-Z])_', '\1:', $p_header['filename']); //repair drive letter
    } else {
        //Add filtering for other systems here
        // BSD: none (tested)
        // Linux: ??
        // MacosX: ??
    }
    $p_header['filename'] = cleardoubleslashes($p_header['filename']); //normalize the slashes/backslashes
    return 1;
}

function unzip_show_status ($list,$removepath) {
//This function shows the results of the unzip execution
//depending of the value of the $CFG->zip, results will be
//text or an array of files.

    global $CFG;

    if (empty($CFG->unzip)) {    // Use built-in php-based zip function
        $strname = get_string("name");
        $strsize = get_string("size");
        $strmodified = get_string("modified");
        $strstatus = get_string("status");
        echo "";
        echo "";
        echo "";
        echo "";
        echo "";
        foreach ($list as $item) {
            echo "";
            $item['filename'] = str_replace(cleardoubleslashes($removepath).'/', "", $item['filename']);
            print_cell("left", $item['filename']);
            if (! $item['folder']) {
                print_cell("right", display_size($item['size']));
            } else {
                echo "";
            }
            $filedate  = userdate($item['mtime'], get_string("strftimedatetime"));
            print_cell("right", $filedate);
            print_cell("right", $item['status']);
            echo "";
        }
        echo "
$strname
$strsize
$strmodified
$strstatus
 
";

    } else {                   // Use external zip program
        print_simple_box_start("center");
        echo "
";
        foreach ($list as $item) {
            echo str_replace(cleardoubleslashes($removepath.'/'), '', $item).'
';
        }
        echo "
";
        print_simple_box_end();
    }
}

/**
 * Returns most reliable client address
 *
 * @return string The remote IP address
 */
 function getremoteaddr() {
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
        return cleanremoteaddr($_SERVER['HTTP_CLIENT_IP']);
    }
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        return cleanremoteaddr($_SERVER['HTTP_X_FORWARDED_FOR']);
    }
    if (!empty($_SERVER['REMOTE_ADDR'])) {
        return cleanremoteaddr($_SERVER['REMOTE_ADDR']);
    }
    return '';
}

/**
 * Cleans a remote address ready to put into the log table
 */
function cleanremoteaddr($addr) {
    $originaladdr = $addr;
    $matches = array();
    // first get all things that look like IP addresses.
    if (!preg_match_all('/(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/',$addr,$matches,PREG_SET_ORDER)) {
        return '';
    }
    $goodmatches = array();
    $lanmatches = array();
    foreach ($matches as $match) {
        //        print_r($match);
        // check to make sure it's not an internal address.
        // the following are reserved for private lans...
        // 10.0.0.0 - 10.255.255.255
        // 172.16.0.0 - 172.31.255.255
        // 192.168.0.0 - 192.168.255.255
        // 169.254.0.0 -169.254.255.255
        $bits = explode('.',$match[0]);
        if (count($bits) != 4) {
            // weird, preg match shouldn't give us it.
            continue;
        }
        if (($bits[0] == 10)
            || ($bits[0] == 172 && $bits[1] >= 16 && $bits[1] <= 31)
            || ($bits[0] == 192 && $bits[1] == 168)
            || ($bits[0] == 169 && $bits[1] == 254)) {
            $lanmatches[] = $match[0];
            continue;
        }
        // finally, it's ok
        $goodmatches[] = $match[0];
    }
    if (!count($goodmatches)) {
        // perhaps we have a lan match, it's probably better to return that.
        if (!count($lanmatches)) {
            return '';
        } else {
            return array_pop($lanmatches);
        }
    }
    if (count($goodmatches) == 1) {
        return $goodmatches[0];
    }
    error_log("NOTICE: cleanremoteaddr gives us something funny: $originaladdr had ".count($goodmatches)." matches");
    // we need to return something, so
    return array_pop($goodmatches);
}

/**
 * html_entity_decode is only supported by php 4.3.0 and higher
 * so if it is not predefined, define it here
 *
 * @param string $string ?
 * @return string
 * @todo Finish documenting this function
 */
if(!function_exists('html_entity_decode')) {
     function html_entity_decode($string) {
        $trans_tbl = get_html_translation_table(HTML_ENTITIES);
        $trans_tbl = array_flip($trans_tbl);
        return strtr($string, $trans_tbl);
    }
}

/**
 * The clone keyword is only supported from PHP 5 onwards.
 * The behaviour of $obj2 = $obj1 differs fundamentally
 * between PHP 4 and PHP 5. In PHP 4 a copy of $obj1 was
 * created, in PHP 5 $obj1 is referenced. To create a copy
 * in PHP 5 the clone keyword was introduced. This function
 * simulates this behaviour for PHP < 5.0.0.
 * See also: http://mjtsai.com/blog/2004/07/15/php-5-object-references/
 *
 * Modified 2005-09-29 by Eloy (from Julian Sedding proposal)
 * Found a better implementation (more checks and possibilities) from PEAR:
 * http://cvs.php.net/co.php/pear/PHP_Compat/Compat/Function/clone.php
 *
 * @param object $obj
 * @return object
 */
if(!check_php_version('5.0.0')) {
// the eval is needed to prevent PHP 5 from getting a parse error!
eval('
    function clone($obj) {
    /// Sanity check
        if (!is_object($obj)) {
            user_error(\'clone() __clone method called on non-object\', E_USER_WARNING);
            return;
        }

    /// Use serialize/unserialize trick to deep copy the object
        $obj = unserialize(serialize($obj));

    /// If there is a __clone method call it on the "new" class
        if (method_exists($obj, \'__clone\')) {
            $obj->__clone();
        }

        return $obj;
    }
');
}

/**
 * If new messages are waiting for the current user, then return
 * Javascript code to create a popup window
 *
 * @return string Javascript code
 */
function message_popup_window() {
    global $USER;

    $popuplimit = 30;     // Minimum seconds between popups

    if (!defined('MESSAGE_WINDOW')) {
        if (isset($USER->id)) {
            if (!isset($USER->message_lastpopup)) {
                $USER->message_lastpopup = 0;
            }
            if ((time() - $USER->message_lastpopup) > $popuplimit) {  /// It's been long enough
                if (get_user_preferences('message_showmessagewindow', 1) == 1) {
                    if (count_records_select('message', 'useridto = \''.$USER->id.'\' AND timecreated > \''.$USER->message_lastpopup.'\'')) {
                        $USER->message_lastpopup = time();
                        return '";
                    }
                }
            }
        }
    }

    return '';
}

// Used to make sure that $min <= $value <= $max
function bounded_number($min, $value, $max) {
    if($value < $min) {
        return $min;
    }
    if($value > $max) {
        return $max;
    }
    return $value;
}

function array_is_nested($array) {
    foreach ($array as $value) {
        if (is_array($value)) {
            return true;
        }
    }
    return false;
}

/**
 *** get_performance_info() pairs up with init_performance_info()
 *** loaded in setup.php. Returns an array with 'html' and 'txt'
 *** values ready for use, and each of the individual stats provided
 *** separately as well.
 ***
 **/
function get_performance_info() {
    global $CFG, $PERF;

    $info = array();
    $info['html'] = '';         // holds userfriendly HTML representation
    $info['txt']  = me() . ' '; // holds log-friendly representation

    $info['realtime'] = microtime_diff($PERF->starttime, microtime());

    $info['html'] .= ''.$info['realtime'].' secs ';
    $info['txt'] .= 'time: '.$info['realtime'].'s ';

    if (function_exists('memory_get_usage')) {
        $info['memory_total'] = memory_get_usage();
        $info['memory_growth'] = memory_get_usage() - $PERF->startmemory;
        $info['html'] .= 'RAM: '.display_size($info['memory_total']).' ';
        $info['txt']  .= 'memory_total: '.$info['memory_total'].'B (' . display_size($info['memory_total']).') memory_growth: '.$info['memory_growth'].'B ('.display_size($info['memory_growth']).') ';
    }

    $inc = get_included_files();
    //error_log(print_r($inc,1));
    $info['includecount'] = count($inc);
    $info['html'] .= 'Included '.$info['includecount'].' files ';
    $info['txt']  .= 'includecount: '.$info['includecount'].' ';

    if (!empty($PERF->dbqueries)) {
        $info['dbqueries'] = $PERF->dbqueries;
        $info['html'] .= 'DB queries '.$info['dbqueries'].' ';
        $info['txt'] .= 'dbqueries: '.$info['dbqueries'].' ';
    }

    if (!empty($PERF->logwrites)) {
        $info['logwrites'] = $PERF->logwrites;
        $info['html'] .= 'Log writes '.$info['logwrites'].' ';
        $info['txt'] .= 'logwrites: '.$info['logwrites'].' ';
    }

    if (function_exists('posix_times')) {
        $ptimes = posix_times();
        if (is_array($ptimes)) {
            foreach ($ptimes as $key => $val) {
                $info[$key] = $ptimes[$key] -  $PERF->startposixtimes[$key];
            }
            $info['html'] .= "ticks: $info[ticks] user: $info[utime] sys: $info[stime] cuser: $info[cutime] csys: $info[cstime] ";
            $info['txt'] .= "ticks: $info[ticks] user: $info[utime] sys: $info[stime] cuser: $info[cutime] csys: $info[cstime] ";
        }
    }

    // Grab the load average for the last minute
    // /proc will only work under some linux configurations
    // while uptime is there under MacOSX/Darwin and other unices
    if (is_readable('/proc/loadavg') && $loadavg = @file('/proc/loadavg')) {
        list($server_load) = explode(' ', $loadavg[0]);
        unset($loadavg);
    } else if ( function_exists('is_executable') && is_executable('/usr/bin/uptime') && $loadavg = `/usr/bin/uptime` ) {
        if (preg_match('/load averages?: (\d+[\.:]\d+)/', $loadavg, $matches)) {
            $server_load = $matches[1];
        } else {
            trigger_error('Could not parse uptime output!');
        }
    }
    if (!empty($server_load)) {
        $info['serverload'] = $server_load;
        $info['html'] .= 'Load average: '.$info['serverload'].' ';
        $info['txt'] .= 'serverload: '.$info['serverload'];
    }


    $info['html'] = '
'.$info['html'].'
';
    return $info;
}

if (!function_exists('file_get_contents')) {
   function file_get_contents($file) {
       $file = file($file);
       return $file ? implode('', $file) : false;
   }
}


function remove_dir($dir, $content_only=false) {
    // if content_only=true then delete all but
    // the directory itself

    $handle = opendir($dir);
    while (false!==($item = readdir($handle))) {
        if($item != '.' && $item != '..') {
            if(is_dir($dir.'/'.$item)) {
                remove_dir($dir.'/'.$item);
            }else{
                unlink($dir.'/'.$item);
            }
        }
    }
    closedir($handle);
    if ($content_only) {
        return true;
    }
    return rmdir($dir);
}

//Function to check if a directory exists
//and, optionally, create it
function check_dir_exists($dir,$create=false) {

    global $CFG;

    $status = true;
    if(!is_dir($dir)) {
        if (!$create) {
            $status = false;
        } else {
            umask(0000);
            $status = mkdir ($dir,$CFG->directorypermissions);
        }
    }
    return $status;
}

function report_session_error() {
    global $CFG, $FULLME;
    if (empty($CFG->lang)) {
        $CFG->lang = "en";
    }
    moodle_setlocale();
    //clear session cookies
    setcookie('MoodleSession'.$CFG->sessioncookie, '', time() - 3600, $CFG->sessioncookiepath);
    setcookie('MoodleSessionTest'.$CFG->sessioncookie, '', time() - 3600, $CFG->sessioncookiepath);
    //increment database error counters
    if (isset($CFG->session_error_counter)) {
        set_config('session_error_counter', 1 + $CFG->session_error_counter);
    } else {
        set_config('session_error_counter', 1);
    }
    redirect($FULLME, get_string('sessionerroruser2', 'error'), 5);
}


/**
 * Detect if an object or a class contains a given property
 * will take an actual object or the name of a class
 * @param mix $obj Name of class or real object to test
 * @param string $property name of property to find
 * @return bool true if property exists
 */
function object_property_exists( $obj, $property ) {
    if (is_string( $obj )) {
        $properties = get_class_vars( $obj );
    }
    else {
        $properties = get_object_vars( $obj );
    }
    return array_key_exists( $property, $properties );
}


/**
 * Detect a custom script replacement in the data directory that will
 * replace an existing moodle script
 * @param string $urlpath path to the original script
 * @return string full path name if a custom script exists
 * @return bool false if no custom script exists
 */
function custom_script_path($urlpath='') {
    global $CFG;

    // set default $urlpath, if necessary
    if (empty($urlpath)) {
        $urlpath = qualified_me(); // e.g. http://www.this-server.com/moodle/this-script.php
    }

    // clean the $urlpath
    $urlpath = clean_param($urlpath, PARAM_URL);

    // $urlpath is invalid if it is empty or does not start with the Moodle wwwroot
    if (empty($urlpath) or (strpos($urlpath, $CFG->wwwroot) === false )) {
        return false;
    }

    // replace wwwroot with the path to the customscripts folder
    $scriptpath = $CFG->customscripts . substr($urlpath, strlen($CFG->wwwroot));

    // remove the query string, if any
    if (($strpos = strpos($scriptpath, '?')) !== false) {
        $scriptpath = substr($scriptpath, 0, $strpos);
    }

    // remove trailing slashes, if any
    $scriptpath = rtrim($scriptpath, '/\\');

    // append index.php, if necessary
    if (is_dir($scriptpath)) {
        $scriptpath .= '/index.php';
    }

    // check the custom script exists
    if (file_exists($scriptpath)) {
        return $scriptpath;
    } else {
        return false;
    }
}

/**
 * Wrapper function to load necessary editor scripts
 * to $CFG->editorsrc array. Params can be coursei id
 * or associative array('courseid' => value, 'name' => 'editorname').
 * @uses $CFG
 * @param mixed $args Courseid or associative array.
 */
function loadeditor($args) {
    global $CFG;
    include($CFG->libdir .'/editorlib.php');
    return editorObject::loadeditor($args);
}

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?>