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moodle/lib/datalib.php
martinlanghoff 5970ccfbaf get_my_courses(): tighten cache scheme - part 2 
the tighter cache was fragile as we always edit $field
2007-05-06 05:26:04 +00:00

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<?php // $Id$
/**
* Library of functions for database manipulation.
*
* Other main libraries:
* - weblib.php - functions that produce web output
* - moodlelib.php - general-purpose Moodle functions
* @author Martin Dougiamas and many others
* @version $Id$
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package moodlecore
*/
/**
* Escape all dangerous characters in a data record
*
* $dataobject is an object containing needed data
* Run over each field exectuting addslashes() function
* to escape SQL unfriendly characters (e.g. quotes)
* Handy when writing back data read from the database
*
* @param $dataobject Object containing the database record
* @return object Same object with neccessary characters escaped
*/
function addslashes_object( $dataobject ) {
$a = get_object_vars( $dataobject);
foreach ($a as $key=>$value) {
$a[$key] = addslashes( $value );
}
return (object)$a;
}
/// USER DATABASE ////////////////////////////////////////////////
/**
* Returns $user object of the main admin user
* primary admin = admin with lowest role_assignment id among admins
* @uses $CFG
* @return object(admin) An associative array representing the admin user.
*/
function get_admin () {
global $CFG;
if ( $admins = get_admins() ) {
foreach ($admins as $admin) {
return $admin; // ie the first one
}
} else {
return false;
}
}
/**
* Returns list of all admins
*
* @uses $CFG
* @return object
*/
function get_admins() {
global $CFG;
$context = get_context_instance(CONTEXT_SYSTEM, SITEID);
return get_users_by_capability($context, 'moodle/site:doanything', 'u.*, ra.id as adminid', 'ra.id ASC'); // only need first one
}
function get_courses_in_metacourse($metacourseid) {
global $CFG;
$sql = "SELECT c.id,c.shortname,c.fullname FROM {$CFG->prefix}course c, {$CFG->prefix}course_meta mc WHERE mc.parent_course = $metacourseid
AND mc.child_course = c.id ORDER BY c.shortname";
return get_records_sql($sql);
}
function get_courses_notin_metacourse($metacourseid,$count=false) {
global $CFG;
if ($count) {
$sql = "SELECT COUNT(c.id)";
} else {
$sql = "SELECT c.id,c.shortname,c.fullname";
}
$alreadycourses = get_courses_in_metacourse($metacourseid);
$sql .= " FROM {$CFG->prefix}course c WHERE ".((!empty($alreadycourses)) ? "c.id NOT IN (".implode(',',array_keys($alreadycourses)).")
AND " : "")." c.id !=$metacourseid and c.id != ".SITEID." and c.metacourse != 1 ".((empty($count)) ? " ORDER BY c.shortname" : "");
return get_records_sql($sql);
}
function count_courses_notin_metacourse($metacourseid) {
global $CFG;
$alreadycourses = get_courses_in_metacourse($metacourseid);
$sql = "SELECT COUNT(c.id) AS notin FROM {$CFG->prefix}course c
WHERE ".((!empty($alreadycourses)) ? "c.id NOT IN (".implode(',',array_keys($alreadycourses)).")
AND " : "")." c.id !=$metacourseid and c.id != ".SITEID." and c.metacourse != 1";
if (!$count = get_record_sql($sql)) {
return 0;
}
return $count->notin;
}
/**
* Search through course users
*
* If $coursid specifies the site course then this function searches
* through all undeleted and confirmed users
*
* @uses $CFG
* @uses SITEID
* @param int $courseid The course in question.
* @param int $groupid The group in question.
* @param string $searchtext ?
* @param string $sort ?
* @param string $exceptions ?
* @return object
*/
function search_users($courseid, $groupid, $searchtext, $sort='', $exceptions='') {
global $CFG;
$LIKE = sql_ilike();
$fullname = sql_fullname('u.firstname', 'u.lastname');
if (!empty($exceptions)) {
$except = ' AND u.id NOT IN ('. $exceptions .') ';
} else {
$except = '';
}
if (!empty($sort)) {
$order = ' ORDER BY '. $sort;
} else {
$order = '';
}
$select = 'u.deleted = \'0\' AND u.confirmed = \'1\'';
if (!$courseid or $courseid == SITEID) {
return get_records_sql("SELECT u.id, u.firstname, u.lastname, u.email
FROM {$CFG->prefix}user u
WHERE $select
AND ($fullname $LIKE '%$searchtext%' OR u.email $LIKE '%$searchtext%')
$except $order");
} else {
if ($groupid) {
//TODO:check. Remove group DB dependencies.
return get_records_sql("SELECT u.id, u.firstname, u.lastname, u.email
FROM {$CFG->prefix}user u,
".groups_members_from_sql()."
WHERE $select AND ".groups_members_where_sql($groupid, 'u.id')."
AND ($fullname $LIKE '%$searchtext%' OR u.email $LIKE '%$searchtext%')
$except $order");
} else {
$context = get_context_instance(CONTEXT_COURSE, $courseid);
$contextlists = get_related_contexts_string($context);
$users = get_records_sql("SELECT u.id, u.firstname, u.lastname, u.email
FROM {$CFG->prefix}user u,
{$CFG->prefix}role_assignments ra
WHERE $select AND ra.contextid $contextlists AND ra.userid = u.id
AND ($fullname $LIKE '%$searchtext%' OR u.email $LIKE '%$searchtext%')
$except $order");
}
return $users;
}
}
/**
* Returns a list of all site users
* Obsolete, just calls get_course_users(SITEID)
*
* @uses SITEID
* @deprecated Use {@link get_course_users()} instead.
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @return object|false {@link $USER} records or false if error.
*/
function get_site_users($sort='u.lastaccess DESC', $fields='*', $exceptions='') {
return get_course_users(SITEID, $sort, $exceptions, $fields);
}
/**
* Returns a subset of users
*
* @uses $CFG
* @param bool $get If false then only a count of the records is returned
* @param string $search A simple string to search for
* @param bool $confirmed A switch to allow/disallow unconfirmed users
* @param array(int) $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
* @param string $sort A SQL snippet for the sorting criteria to use
* @param string $firstinitial ?
* @param string $lastinitial ?
* @param string $page ?
* @param string $recordsperpage ?
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @return object|false|int {@link $USER} records unless get is false in which case the integer count of the records found is returned. False is returned if an error is encountered.
*/
function get_users($get=true, $search='', $confirmed=false, $exceptions='', $sort='firstname ASC',
$firstinitial='', $lastinitial='', $page='', $recordsperpage='', $fields='*') {
global $CFG;
if ($get && !$recordsperpage) {
debugging('Call to get_users with $get = true no $recordsperpage limit. ' .
'On large installations, this will probably cause an out of memory error. ' .
'Please think again and change your code so that it does not try to ' .
'load so much data into memory.', DEBUG_DEVELOPER);
}
$LIKE = sql_ilike();
$fullname = sql_fullname();
$select = 'username <> \'guest\' AND deleted = 0';
if (!empty($search)){
$search = trim($search);
$select .= " AND ($fullname $LIKE '%$search%' OR email $LIKE '%$search%') ";
}
if ($confirmed) {
$select .= ' AND confirmed = \'1\' ';
}
if ($exceptions) {
$select .= ' AND id NOT IN ('. $exceptions .') ';
}
if ($firstinitial) {
$select .= ' AND firstname '. $LIKE .' \''. $firstinitial .'%\'';
}
if ($lastinitial) {
$select .= ' AND lastname '. $LIKE .' \''. $lastinitial .'%\'';
}
if ($get) {
return get_records_select('user', $select, $sort, $fields, $page, $recordsperpage);
} else {
return count_records_select('user', $select);
}
}
/**
* shortdesc (optional)
*
* longdesc
*
* @uses $CFG
* @param string $sort ?
* @param string $dir ?
* @param int $categoryid ?
* @param int $categoryid ?
* @param string $search ?
* @param string $firstinitial ?
* @param string $lastinitial ?
* @returnobject {@link $USER} records
* @todo Finish documenting this function
*/
function get_users_listing($sort='lastaccess', $dir='ASC', $page=0, $recordsperpage=0,
$search='', $firstinitial='', $lastinitial='', $remotewhere='') {
global $CFG;
$LIKE = sql_ilike();
$fullname = sql_fullname();
$select = "deleted <> '1'";
if (!empty($search)) {
$search = trim($search);
$select .= " AND ($fullname $LIKE '%$search%' OR email $LIKE '%$search%') ";
}
if ($firstinitial) {
$select .= ' AND firstname '. $LIKE .' \''. $firstinitial .'%\' ';
}
if ($lastinitial) {
$select .= ' AND lastname '. $LIKE .' \''. $lastinitial .'%\' ';
}
$select .= $remotewhere;
if ($sort) {
$sort = ' ORDER BY '. $sort .' '. $dir;
}
/// warning: will return UNCONFIRMED USERS
return get_records_sql("SELECT id, username, email, firstname, lastname, city, country, lastaccess, confirmed, mnethostid
FROM {$CFG->prefix}user
WHERE $select $sort", $page, $recordsperpage);
}
/**
* Full list of users that have confirmed their accounts.
*
* @uses $CFG
* @return object
*/
function get_users_confirmed() {
global $CFG;
return get_records_sql("SELECT *
FROM {$CFG->prefix}user
WHERE confirmed = 1
AND deleted = 0
AND username <> 'guest'");
}
/**
* Full list of users that have not yet confirmed their accounts.
*
* @uses $CFG
* @param string $cutofftime ?
* @return object {@link $USER} records
*/
function get_users_unconfirmed($cutofftime=2000000000) {
global $CFG;
return get_records_sql("SELECT *
FROM {$CFG->prefix}user
WHERE confirmed = 0
AND firstaccess > 0
AND firstaccess < $cutofftime");
}
/**
* All users that we have not seen for a really long time (ie dead accounts)
*
* @uses $CFG
* @param string $cutofftime ?
* @return object {@link $USER} records
*/
function get_users_longtimenosee($cutofftime) {
global $CFG;
return get_records_sql("SELECT userid as id, courseid
FROM {$CFG->prefix}user_lastaccess
WHERE courseid != ".SITEID."
AND timeaccess > 0
AND timeaccess < $cutofftime ");
}
/**
* Full list of bogus accounts that are probably not ever going to be used
*
* @uses $CFG
* @param string $cutofftime ?
* @return object {@link $USER} records
*/
function get_users_not_fully_set_up($cutofftime=2000000000) {
global $CFG;
return get_records_sql("SELECT *
FROM {$CFG->prefix}user
WHERE confirmed = 1
AND lastaccess > 0
AND lastaccess < $cutofftime
AND deleted = 0
AND (lastname = '' OR firstname = '' OR email = '')");
}
/** TODO: functions now in /group/lib/legacylib.php (3)
get_groups
get_group_users
user_group
* Returns an array of group objects that the user is a member of
* in the given course. If userid isn't specified, then return a
* list of all groups in the course.
*
* @uses $CFG
* @param int $courseid The id of the course in question.
* @param int $userid The id of the user in question as found in the 'user' table 'id' field.
* @return object
*
function get_groups($courseid, $userid=0) {
global $CFG;
if ($userid) {
$dbselect = ', '. $CFG->prefix .'groups_members m';
$userselect = 'AND m.groupid = g.id AND m.userid = \''. $userid .'\'';
} else {
$dbselect = '';
$userselect = '';
}
return get_records_sql("SELECT g.*
FROM {$CFG->prefix}groups g $dbselect
WHERE g.courseid = '$courseid' $userselect ");
}
/**
* Returns an array of user objects that belong to a given group
*
* @uses $CFG
* @param int $groupid The group in question.
* @param string $sort ?
* @param string $exceptions ?
* @return object
*
function get_group_users($groupid, $sort='u.lastaccess DESC', $exceptions='', $fields='u.*') {
global $CFG;
if (!empty($exceptions)) {
$except = ' AND u.id NOT IN ('. $exceptions .') ';
} else {
$except = '';
}
// in postgres, you can't have things in sort that aren't in the select, so...
$extrafield = str_replace('ASC','',$sort);
$extrafield = str_replace('DESC','',$extrafield);
$extrafield = trim($extrafield);
if (!empty($extrafield)) {
$extrafield = ','.$extrafield;
}
return get_records_sql("SELECT $fields $extrafield
FROM {$CFG->prefix}user u,
{$CFG->prefix}groups_members m
WHERE m.groupid = '$groupid'
AND m.userid = u.id $except
ORDER BY $sort");
}
/**
* Returns the user's group in a particular course
*
* @uses $CFG
* @param int $courseid The course in question.
* @param int $userid The id of the user as found in the 'user' table.
* @param int $groupid The id of the group the user is in.
* @return object
*
function user_group($courseid, $userid) {
global $CFG;
return get_records_sql("SELECT g.*
FROM {$CFG->prefix}groups g,
{$CFG->prefix}groups_members m
WHERE g.courseid = '$courseid'
AND g.id = m.groupid
AND m.userid = '$userid'
ORDER BY name ASC");
}
*/
/// OTHER SITE AND COURSE FUNCTIONS /////////////////////////////////////////////
/**
* Returns $course object of the top-level site.
*
* @return course A {@link $COURSE} object for the site
*/
function get_site() {
global $SITE;
if (!empty($SITE->id)) { // We already have a global to use, so return that
return $SITE;
}
if ($course = get_record('course', 'category', 0)) {
return $course;
} else {
return false;
}
}
/**
* Returns list of courses, for whole site, or category
*
* Returns list of courses, for whole site, or category
* Important: Using c.* for fields is extremely expensive because
* we are using distinct. You almost _NEVER_ need all the fields
* in such a large SELECT
*
* @param type description
*
*/
function get_courses($categoryid="all", $sort="c.sortorder ASC", $fields="c.*") {
global $USER, $CFG;
if ($categoryid != "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = '$categoryid'";
} else {
$categoryselect = "";
}
if (empty($sort)) {
$sortstatement = "";
} else {
$sortstatement = "ORDER BY $sort";
}
$visiblecourses = array();
// pull out all course matching the cat
if ($courses = get_records_sql("SELECT $fields
FROM {$CFG->prefix}course c
$categoryselect
$sortstatement")) {
// loop throught them
foreach ($courses as $course) {
if (isset($course->visible) && $course->visible <= 0) {
// for hidden courses, require visibility check
if (has_capability('moodle/course:viewhiddencourses',
get_context_instance(CONTEXT_COURSE, $course->id))) {
$visiblecourses [] = $course;
}
} else {
$visiblecourses [] = $course;
}
}
}
return $visiblecourses;
/*
$teachertable = "";
$visiblecourses = "";
$sqland = "";
if (!empty($categoryselect)) {
$sqland = "AND ";
}
if (!empty($USER->id)) { // May need to check they are a teacher
if (!has_capability('moodle/course:create', get_context_instance(CONTEXT_SYSTEM, SITEID))) {
$visiblecourses = "$sqland ((c.visible > 0) OR t.userid = '$USER->id')";
$teachertable = "LEFT JOIN {$CFG->prefix}user_teachers t ON t.course = c.id";
}
} else {
$visiblecourses = "$sqland c.visible > 0";
}
if ($categoryselect or $visiblecourses) {
$selectsql = "{$CFG->prefix}course c $teachertable WHERE $categoryselect $visiblecourses";
} else {
$selectsql = "{$CFG->prefix}course c $teachertable";
}
$extrafield = str_replace('ASC','',$sort);
$extrafield = str_replace('DESC','',$extrafield);
$extrafield = trim($extrafield);
if (!empty($extrafield)) {
$extrafield = ','.$extrafield;
}
return get_records_sql("SELECT ".((!empty($teachertable)) ? " DISTINCT " : "")." $fields $extrafield FROM $selectsql ".((!empty($sort)) ? "ORDER BY $sort" : ""));
*/
}
/**
* Returns list of courses, for whole site, or category
*
* Similar to get_courses, but allows paging
* Important: Using c.* for fields is extremely expensive because
* we are using distinct. You almost _NEVER_ need all the fields
* in such a large SELECT
*
* @param type description
*
*/
function get_courses_page($categoryid="all", $sort="c.sortorder ASC", $fields="c.*",
&$totalcount, $limitfrom="", $limitnum="") {
global $USER, $CFG;
$categoryselect = "";
if ($categoryid != "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = '$categoryid'";
} else {
$categoryselect = "";
}
// pull out all course matching the cat
$visiblecourses = array();
if (!($courses = get_records_sql("SELECT $fields
FROM {$CFG->prefix}course c
$categoryselect
ORDER BY $sort"))) {
return $visiblecourses;
}
$totalcount = 0;
if (!$limitnum) {
$limitnum = count($courses);
}
if (!$limitfrom) {
$limitfrom = 0;
}
// iteration will have to be done inside loop to keep track of the limitfrom and limitnum
foreach ($courses as $course) {
if ($course->visible <= 0) {
// for hidden courses, require visibility check
if (has_capability('moodle/course:viewhiddencourses', get_context_instance(CONTEXT_COURSE, $course->id))) {
$totalcount++;
if ($totalcount > $limitfrom && count($visiblecourses) < $limitnum) {
$visiblecourses [] = $course;
}
}
} else {
$totalcount++;
if ($totalcount > $limitfrom && count($visiblecourses) < $limitnum) {
$visiblecourses [] = $course;
}
}
}
return $visiblecourses;
/**
$categoryselect = "";
if ($categoryid != "all" && is_numeric($categoryid)) {
$categoryselect = "c.category = '$categoryid'";
}
$teachertable = "";
$visiblecourses = "";
$sqland = "";
if (!empty($categoryselect)) {
$sqland = "AND ";
}
if (!empty($USER) and !empty($USER->id)) { // May need to check they are a teacher
if (!has_capability('moodle/course:create', get_context_instance(CONTEXT_SYSTEM, SITEID))) {
$visiblecourses = "$sqland ((c.visible > 0) OR t.userid = '$USER->id')";
$teachertable = "LEFT JOIN {$CFG->prefix}user_teachers t ON t.course=c.id";
}
} else {
$visiblecourses = "$sqland c.visible > 0";
}
if ($limitfrom !== "") {
$limit = sql_paging_limit($limitfrom, $limitnum);
} else {
$limit = "";
}
$selectsql = "{$CFG->prefix}course c $teachertable WHERE $categoryselect $visiblecourses";
$totalcount = count_records_sql("SELECT COUNT(DISTINCT c.id) FROM $selectsql");
return get_records_sql("SELECT $fields FROM $selectsql ".((!empty($sort)) ? "ORDER BY $sort" : "")." $limit");
*/
}
/**
* List of courses that a user has access to view. Note that for admins,
* this usually includes every course on the system.
*
* @uses $CFG
* @param int $userid The user of interest
* @param string $sort the sortorder in the course table
* @param string $fields the fields to return
* @param bool $doanything True if using the doanything flag
* @param int $limit Maximum number of records to return, or 0 for unlimited
* @return array {@link $COURSE} of course objects
*/
function get_my_courses($userid, $sort=NULL, $fields=NULL, $doanything=false,$limit=0) {
global $USER;
// Default parameters
$d_sort = 'visible DESC,sortorder ASC';
$d_fields = '*';
$usingdefaults = true;
if (is_null($sort)) {
$sort = $d_sort;
} else {
$usingdefaults = false;
}
if (is_null($fields)) {
$fields = $d_fields;
} else {
$usingdefaults = false;
}
// If using default params, we may have it cached...
if (!empty($USER->id) && ($USER->id == $userid) && $usingdefaults) {
if (!empty($USER->mycourses[$doanything])) {
return $USER->mycourses[$doanything];
}
}
$mycourses = array();
// Fix fields to refer to the course table c
$fields=preg_replace('/([a-z0-9*]+)/','c.$1',$fields);
// Attempt to filter the list of courses in order to reduce the number
// of queries in the next part.
// Check root permissions
$sitecontext = get_context_instance(CONTEXT_SYSTEM, SITEID);
if (has_capability('moodle/course:view',$sitecontext,$userid,$doanything)) {
// User can view all courses, although there might be exceptions
// which we will filter later.
$rs = get_recordset('course c', '', '', $sort, $fields);
} else {
// The only other context level above courses that applies to moodle/course:view
// is category. So we consider:
// 1. All courses in which the user is assigned a role
// 2. All courses in categories in which the user is assigned a role
// 3. All courses which have overrides for moodle/course:view
// Remember that this is just a filter. We check each individual course later.
// However for a typical student on a large system this can reduce the
// number of courses considered from around 2,000 to around 2, with corresponding
// reduction in the number of queries needed.
global $CFG;
$rs=get_recordset_sql("
SELECT
$fields
FROM
{$CFG->prefix}role_assignments ra
INNER JOIN {$CFG->prefix}context x ON x.id=ra.contextid
INNER JOIN {$CFG->prefix}course c ON x.instanceid=c.id AND x.contextlevel=50
WHERE
ra.userid=$userid
UNION
SELECT
$fields
FROM
{$CFG->prefix}role_assignments ra
INNER JOIN {$CFG->prefix}context x ON x.id=ra.contextid
INNER JOIN {$CFG->prefix}course_categories a ON x.instanceid=a.id AND x.contextlevel=40
INNER JOIN {$CFG->prefix}course c ON c.category=a.id
WHERE
ra.userid=$userid
UNION
SELECT
$fields
FROM
{$CFG->prefix}role_capabilities ca
INNER JOIN {$CFG->prefix}context x ON x.id=ca.contextid AND x.contextlevel=50
INNER JOIN {$CFG->prefix}course c ON c.id=x.instanceid
WHERE
ca.contextid <> {$sitecontext->id} AND ca.capability='moodle/course:view'
ORDER BY $sort");
}
if ($rs && $rs->RecordCount() > 0) {
while ($course = rs_fetch_next_record($rs)) {
if ($course->id != SITEID) {
// users with moodle/course:view are considered course participants
// the course needs to be visible, or user must have moodle/course:viewhiddencourses
// capability set to view hidden courses
$context = get_context_instance(CONTEXT_COURSE, $course->id);
if ( has_capability('moodle/course:view', $context, $userid, $doanything) &&
!has_capability('moodle/legacy:guest', $context, $userid, false) &&
($course->visible || has_capability('moodle/course:viewhiddencourses', $context, $userid))) {
$mycourses[$course->id] = $course;
// Only return a limited number of courses if limit is set
if($limit>0) {
$limit--;
if($limit==0) {
break;
}
}
}
}
}
}
/// MDL-9238, course in sub categories are not shown
// if the user has course:view at system level, then he can view all course
// skip this part
if (!has_capability('moodle/course:view',$sitecontext,$userid,$doanything)) {
// get all course categories with an assignment
$SQL = "SELECT a.id, a.id FROM {$CFG->prefix}role_assignments ra
INNER JOIN {$CFG->prefix}context x ON x.id=ra.contextid
INNER JOIN {$CFG->prefix}course_categories a ON x.instanceid=a.id AND x.contextlevel=40
WHERE ra.userid=$userid";
if ($mcoursecats = get_records_sql($SQL)) {
foreach ($mcoursecats as $mcoursecat) {
// run the sql to get the path, find all courses in each sub (sub) categories
$pathsql = "SELECT $fields
FROM {$CFG->prefix}course_categories cc,
{$CFG->prefix}course c
WHERE cc.path LIKE '%".$mcoursecat->id."/%'
AND c.category = cc.id";
if ($scourses = get_records_sql($pathsql)) {
// add each course in sub category, if correct permissions are set
// and if the course is not added to my courses list yet
foreach ($scourses as $scourse) {
$context = get_context_instance(CONTEXT_COURSE, $scourse->id);
if (!isset($mycourses[$scourse->id]) &&
has_capability('moodle/course:view', $context, $userid, $doanything) &&
!has_capability('moodle/legacy:guest', $context, $userid, false) &&
($scourse->visible ||
has_capability('moodle/course:viewhiddencourses', $context, $userid))) {
// add it to my course array
$mycourses[$scourse->id] = $scourse;
}
// Only return a limited number of courses if limit is set
if($limit>0) {
$limit--;
if($limit==0) {
// breaks the 2 foreach loops
break 2;
}
}
}
}
}
}
}
// Cache if using default params...
if (!empty($USER->id) && ($USER->id == $userid) && $usingdefaults) {
$USER->mycourses[$doanything] = $mycourses;
}
return $mycourses;
}
/**
* A list of courses that match a search
*
* @uses $CFG
* @param array $searchterms ?
* @param string $sort ?
* @param int $page ?
* @param int $recordsperpage ?
* @param int $totalcount Passed in by reference. ?
* @return object {@link $COURSE} records
*/
function get_courses_search($searchterms, $sort='fullname ASC', $page=0, $recordsperpage=50, &$totalcount) {
global $CFG;
//to allow case-insensitive search for postgesql
if ($CFG->dbfamily == 'postgres') {
$LIKE = 'ILIKE';
$NOTLIKE = 'NOT ILIKE'; // case-insensitive
$REGEXP = '~*';
$NOTREGEXP = '!~*';
} else {
$LIKE = 'LIKE';
$NOTLIKE = 'NOT LIKE';
$REGEXP = 'REGEXP';
$NOTREGEXP = 'NOT REGEXP';
}
$fullnamesearch = '';
$summarysearch = '';
foreach ($searchterms as $searchterm) {
/// Under Oracle and MSSQL, trim the + and - operators and perform
/// simpler LIKE search
if ($CFG->dbfamily == 'oracle' || $CFG->dbfamily == 'mssql') {
$searchterm = trim($searchterm, '+-');
}
if ($fullnamesearch) {
$fullnamesearch .= ' AND ';
}
if ($summarysearch) {
$summarysearch .= ' AND ';
}
if (substr($searchterm,0,1) == '+') {
$searchterm = substr($searchterm,1);
$summarysearch .= " summary $REGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
$fullnamesearch .= " fullname $REGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
} else if (substr($searchterm,0,1) == "-") {
$searchterm = substr($searchterm,1);
$summarysearch .= " summary $NOTREGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
$fullnamesearch .= " fullname $NOTREGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
} else {
$summarysearch .= ' summary '. $LIKE .'\'%'. $searchterm .'%\' ';
$fullnamesearch .= ' fullname '. $LIKE .'\'%'. $searchterm .'%\' ';
}
}
$selectsql = $CFG->prefix .'course WHERE ('. $fullnamesearch .' OR '. $summarysearch .') AND category > \'0\'';
$totalcount = count_records_sql('SELECT COUNT(*) FROM '. $selectsql);
$courses = get_records_sql('SELECT * FROM '. $selectsql .' ORDER BY '. $sort, $page, $recordsperpage);
if ($courses) { /// Remove unavailable courses from the list
foreach ($courses as $key => $course) {
if (!$course->visible) {
if (!has_capability('moodle/course:viewhiddencourses', get_context_instance(CONTEXT_COURSE, $course->id))) {
unset($courses[$key]);
$totalcount--;
}
}
}
}
return $courses;
}
/**
* Returns a sorted list of categories
*
* @param string $parent The parent category if any
* @param string $sort the sortorder
* @return array of categories
*/
function get_categories($parent='none', $sort='sortorder ASC') {
if ($parent === 'none') {
$categories = get_records('course_categories', '', '', $sort);
} else {
$categories = get_records('course_categories', 'parent', $parent, $sort);
}
if ($categories) { /// Remove unavailable categories from the list
foreach ($categories as $key => $category) {
if (!$category->visible) {
if (!has_capability('moodle/course:create', get_context_instance(CONTEXT_COURSECAT, $category->id))) {
unset($categories[$key]);
}
}
}
}
return $categories;
}
/**
* Returns an array of category ids of all the subcategories for a given
* category.
* @param $catid - The id of the category whose subcategories we want to find.
* @return array of category ids.
*/
function get_all_subcategories($catid) {
$subcats = array();
if ($categories = get_records('course_categories', 'parent', $catid)) {
foreach ($categories as $cat) {
array_push($subcats, $cat->id);
$subcats = array_merge($subcats, get_all_subcategories($cat->id));
}
}
return $subcats;
}
/**
* This recursive function makes sure that the courseorder is consecutive
*
* @param type description
*
* $n is the starting point, offered only for compatilibity -- will be ignored!
* $safe (bool) prevents it from assuming category-sortorder is unique, used to upgrade
* safely from 1.4 to 1.5
*/
function fix_course_sortorder($categoryid=0, $n=0, $safe=0, $depth=0, $path='') {
global $CFG;
$count = 0;
$catgap = 1000; // "standard" category gap
$tolerance = 200; // how "close" categories can get
if ($categoryid > 0){
// update depth and path
$cat = get_record('course_categories', 'id', $categoryid);
if ($cat->parent == 0) {
$depth = 0;
$path = '';
} else if ($depth == 0 ) { // doesn't make sense; get from DB
// this is only called if the $depth parameter looks dodgy
$parent = get_record('course_categories', 'id', $cat->parent);
$path = $parent->path;
$depth = $parent->depth;
}
$path = $path . '/' . $categoryid;
$depth = $depth + 1;
set_field('course_categories', 'path', addslashes($path), 'id', $categoryid);
set_field('course_categories', 'depth', $depth, 'id', $categoryid);
}
// get some basic info about courses in the category
$info = get_record_sql('SELECT MIN(sortorder) AS min,
MAX(sortorder) AS max,
COUNT(sortorder) AS count
FROM ' . $CFG->prefix . 'course
WHERE category=' . $categoryid);
if (is_object($info)) { // no courses?
$max = $info->max;
$count = $info->count;
$min = $info->min;
unset($info);
}
if ($categoryid > 0 && $n==0) { // only passed category so don't shift it
$n = $min;
}
// $hasgap flag indicates whether there's a gap in the sequence
$hasgap = false;
if ($max-$min+1 != $count) {
$hasgap = true;
}
// $mustshift indicates whether the sequence must be shifted to
// meet its range
$mustshift = false;
if ($min < $n+$tolerance || $min > $n+$tolerance+$catgap ) {
$mustshift = true;
}
// actually sort only if there are courses,
// and we meet one ofthe triggers:
// - safe flag
// - they are not in a continuos block
// - they are too close to the 'bottom'
if ($count && ( $safe || $hasgap || $mustshift ) ) {
// special, optimized case where all we need is to shift
if ( $mustshift && !$safe && !$hasgap) {
$shift = $n + $catgap - $min;
// UPDATE course SET sortorder=sortorder+$shift
execute_sql("UPDATE {$CFG->prefix}course
SET sortorder=sortorder+$shift
WHERE category=$categoryid", 0);
$n = $n + $catgap + $count;
} else { // do it slowly
$n = $n + $catgap;
// if the new sequence overlaps the current sequence, lack of transactions
// will stop us -- shift things aside for a moment...
if ($safe || ($n >= $min && $n+$count+1 < $min && $CFG->dbfamily==='mysql')) {
$shift = $max + $n + 1000;
execute_sql("UPDATE {$CFG->prefix}course
SET sortorder=sortorder+$shift
WHERE category=$categoryid", 0);
}
$courses = get_courses($categoryid, 'c.sortorder ASC', 'c.id,c.sortorder');
begin_sql();
foreach ($courses as $course) {
if ($course->sortorder != $n ) { // save db traffic
set_field('course', 'sortorder', $n, 'id', $course->id);
}
$n++;
}
commit_sql();
}
}
set_field('course_categories', 'coursecount', $count, 'id', $categoryid);
// $n could need updating
$max = get_field_sql("SELECT MAX(sortorder) from {$CFG->prefix}course WHERE category=$categoryid");
if ($max > $n) {
$n = $max;
}
if ($categories = get_categories($categoryid)) {
foreach ($categories as $category) {
$n = fix_course_sortorder($category->id, $n, $safe, $depth, $path);
}
}
return $n+1;
}
/**
* List of remote courses that a user has access to via MNET.
* Works only on the IDP
*
* @uses $CFG, $USER
* @return array {@link $COURSE} of course objects
*/
function get_my_remotecourses($userid=0) {
global $CFG, $USER;
if (empty($userid)) {
$userid = $USER->id;
}
$sql = "SELECT c.remoteid, c.shortname, c.fullname,
c.hostid, c.summary, c.cat_name,
h.name AS hostname
FROM {$CFG->prefix}mnet_enrol_course c
JOIN {$CFG->prefix}mnet_enrol_assignments a ON c.id=a.courseid
JOIN {$CFG->prefix}mnet_host h ON c.hostid=h.id
WHERE a.userid={$userid}";
return get_records_sql($sql);
}
/**
* List of remote hosts that a user has access to via MNET.
* Works on the SP
*
* @uses $CFG, $USER
* @return array of host objects
*/
function get_my_remotehosts() {
global $CFG, $USER;
if ($USER->mnethostid == $CFG->mnet_localhost_id) {
return false; // Return nothing on the IDP
}
if (!empty($USER->mnet_foreign_host_array) && is_array($USER->mnet_foreign_host_array)) {
return $USER->mnet_foreign_host_array;
}
return false;
}
/**
* This function creates a default separated/connected scale
*
* This function creates a default separated/connected scale
* so there's something in the database. The locations of
* strings and files is a bit odd, but this is because we
* need to maintain backward compatibility with many different
* existing language translations and older sites.
*
* @uses $CFG
*/
function make_default_scale() {
global $CFG;
$defaultscale = NULL;
$defaultscale->courseid = 0;
$defaultscale->userid = 0;
$defaultscale->name = get_string('separateandconnected');
$defaultscale->scale = get_string('postrating1', 'forum').','.
get_string('postrating2', 'forum').','.
get_string('postrating3', 'forum');
$defaultscale->timemodified = time();
/// Read in the big description from the file. Note this is not
/// HTML (despite the file extension) but Moodle format text.
$parentlang = get_string('parentlang');
if (is_readable($CFG->dataroot .'/lang/'. $CFG->lang .'/help/forum/ratings.html')) {
$file = file($CFG->dataroot .'/lang/'. $CFG->lang .'/help/forum/ratings.html');
} else if (is_readable($CFG->dirroot .'/lang/'. $CFG->lang .'/help/forum/ratings.html')) {
$file = file($CFG->dirroot .'/lang/'. $CFG->lang .'/help/forum/ratings.html');
} else if ($parentlang and is_readable($CFG->dataroot .'/lang/'. $parentlang .'/help/forum/ratings.html')) {
$file = file($CFG->dataroot .'/lang/'. $parentlang .'/help/forum/ratings.html');
} else if ($parentlang and is_readable($CFG->dirroot .'/lang/'. $parentlang .'/help/forum/ratings.html')) {
$file = file($CFG->dirroot .'/lang/'. $parentlang .'/help/forum/ratings.html');
} else if (is_readable($CFG->dirroot .'/lang/en_utf8/help/forum/ratings.html')) {
$file = file($CFG->dirroot .'/lang/en_utf8/help/forum/ratings.html');
} else {
$file = '';
}
$defaultscale->description = addslashes(implode('', $file));
if ($defaultscale->id = insert_record('scale', $defaultscale)) {
execute_sql('UPDATE '. $CFG->prefix .'forum SET scale = \''. $defaultscale->id .'\'', false);
}
}
/**
* Returns a menu of all available scales from the site as well as the given course
*
* @uses $CFG
* @param int $courseid The id of the course as found in the 'course' table.
* @return object
*/
function get_scales_menu($courseid=0) {
global $CFG;
$sql = "SELECT id, name FROM {$CFG->prefix}scale
WHERE courseid = '0' or courseid = '$courseid'
ORDER BY courseid ASC, name ASC";
if ($scales = get_records_sql_menu($sql)) {
return $scales;
}
make_default_scale();
return get_records_sql_menu($sql);
}
/**
* Given a set of timezone records, put them in the database, replacing what is there
*
* @uses $CFG
* @param array $timezones An array of timezone records
*/
function update_timezone_records($timezones) {
/// Given a set of timezone records, put them in the database
global $CFG;
/// Clear out all the old stuff
execute_sql('TRUNCATE TABLE '.$CFG->prefix.'timezone', false);
/// Insert all the new stuff
foreach ($timezones as $timezone) {
insert_record('timezone', $timezone);
}
}
/// MODULE FUNCTIONS /////////////////////////////////////////////////
/**
* Just gets a raw list of all modules in a course
*
* @uses $CFG
* @param int $courseid The id of the course as found in the 'course' table.
* @return object
*/
function get_course_mods($courseid) {
global $CFG;
if (empty($courseid)) {
return false; // avoid warnings
}
return get_records_sql("SELECT cm.*, m.name as modname
FROM {$CFG->prefix}modules m,
{$CFG->prefix}course_modules cm
WHERE cm.course = '$courseid'
AND cm.module = m.id ");
}
/**
* Given an id of a course module, finds the coursemodule description
*
* @param string $modulename name of module type, eg. resource, assignment,...
* @param int $cmid course module id (id in course_modules table)
* @param int $courseid optional course id for extra validation
* @return object course module instance with instance and module name
*/
function get_coursemodule_from_id($modulename, $cmid, $courseid=0) {
global $CFG;
$courseselect = ($courseid) ? "cm.course = '$courseid' AND " : '';
return get_record_sql("SELECT cm.*, m.name, md.name as modname
FROM {$CFG->prefix}course_modules cm,
{$CFG->prefix}modules md,
{$CFG->prefix}$modulename m
WHERE $courseselect
cm.id = '$cmid' AND
cm.instance = m.id AND
md.name = '$modulename' AND
md.id = cm.module");
}
/**
* Given an instance number of a module, finds the coursemodule description
*
* @param string $modulename name of module type, eg. resource, assignment,...
* @param int $instance module instance number (id in resource, assignment etc. table)
* @param int $courseid optional course id for extra validation
* @return object course module instance with instance and module name
*/
function get_coursemodule_from_instance($modulename, $instance, $courseid=0) {
global $CFG;
$courseselect = ($courseid) ? "cm.course = '$courseid' AND " : '';
return get_record_sql("SELECT cm.*, m.name, md.name as modname
FROM {$CFG->prefix}course_modules cm,
{$CFG->prefix}modules md,
{$CFG->prefix}$modulename m
WHERE $courseselect
cm.instance = m.id AND
md.name = '$modulename' AND
md.id = cm.module AND
m.id = '$instance'");
}
/**
* Returns an array of all the active instances of a particular module in given courses, sorted in the order they are defined
*
* Returns an array of all the active instances of a particular
* module in given courses, sorted in the order they are defined
* in the course. Returns false on any errors.
*
* @uses $CFG
* @param string $modulename The name of the module to get instances for
* @param array $courses This depends on an accurate $course->modinfo
* @return array of instances
*/
function get_all_instances_in_courses($modulename, $courses, $userid=NULL, $includeinvisible=false) {
global $CFG;
if (empty($courses) || !is_array($courses) || count($courses) == 0) {
return array();
}
if (!$rawmods = get_records_sql("SELECT cm.id as coursemodule, m.*,cw.section,cm.visible as visible,cm.groupmode, cm.course
FROM {$CFG->prefix}course_modules cm,
{$CFG->prefix}course_sections cw,
{$CFG->prefix}modules md,
{$CFG->prefix}$modulename m
WHERE cm.course IN (".implode(',',array_keys($courses)).") AND
cm.instance = m.id AND
cm.section = cw.id AND
md.name = '$modulename' AND
md.id = cm.module")) {
return array();
}
$outputarray = array();
foreach ($courses as $course) {
if ($includeinvisible) {
$invisible = -1;
} else if (has_capability('moodle/course:viewhiddencourses', get_context_instance(CONTEXT_COURSE, $course->id), $userid)) {
// Usually hide non-visible instances from students
$invisible = -1;
} else {
$invisible = 0;
}
/// Casting $course->modinfo to string prevents one notice when the field is null
if (!$modinfo = unserialize((string)$course->modinfo)) {
continue;
}
foreach ($modinfo as $mod) {
if ($mod->mod == $modulename and $mod->visible > $invisible) {
$instance = $rawmods[$mod->cm];
if (!empty($mod->extra)) {
$instance->extra = $mod->extra;
}
$outputarray[] = $instance;
}
}
}
return $outputarray;
}
/**
* Returns an array of all the active instances of a particular module in a given course, sorted in the order they are defined
*
* Returns an array of all the active instances of a particular
* module in a given course, sorted in the order they are defined
* in the course. Returns false on any errors.
*
* @uses $CFG
* @param string $modulename The name of the module to get instances for
* @param object(course) $course This depends on an accurate $course->modinfo
*/
function get_all_instances_in_course($modulename, $course, $userid=NULL, $includeinvisible=false) {
global $CFG;
if (empty($course->modinfo)) {
return array();
}
if (!$modinfo = unserialize((string)$course->modinfo)) {
return array();
}
if (!$rawmods = get_records_sql("SELECT cm.id as coursemodule, m.*,cw.section,cm.visible as visible,cm.groupmode
FROM {$CFG->prefix}course_modules cm,
{$CFG->prefix}course_sections cw,
{$CFG->prefix}modules md,
{$CFG->prefix}$modulename m
WHERE cm.course = '$course->id' AND
cm.instance = m.id AND
cm.section = cw.id AND
md.name = '$modulename' AND
md.id = cm.module")) {
return array();
}
if ($includeinvisible) {
$invisible = -1;
} else if (has_capability('moodle/course:viewhiddencourses', get_context_instance(CONTEXT_COURSE, $course->id), $userid)) {
// Usually hide non-visible instances from students
$invisible = -1;
} else {
$invisible = 0;
}
$outputarray = array();
foreach ($modinfo as $mod) {
if ($mod->mod == $modulename and $mod->visible > $invisible) {
$instance = $rawmods[$mod->cm];
if (!empty($mod->extra)) {
$instance->extra = $mod->extra;
}
$outputarray[] = $instance;
}
}
return $outputarray;
}
/**
* Determine whether a module instance is visible within a course
*
* Given a valid module object with info about the id and course,
* and the module's type (eg "forum") returns whether the object
* is visible or not
*
* @uses $CFG
* @param $moduletype Name of the module eg 'forum'
* @param $module Object which is the instance of the module
* @return bool
*/
function instance_is_visible($moduletype, $module) {
global $CFG;
if (!empty($module->id)) {
if ($records = get_records_sql("SELECT cm.instance, cm.visible
FROM {$CFG->prefix}course_modules cm,
{$CFG->prefix}modules m
WHERE cm.course = '$module->course' AND
cm.module = m.id AND
m.name = '$moduletype' AND
cm.instance = '$module->id'")) {
foreach ($records as $record) { // there should only be one - use the first one
return $record->visible;
}
}
}
return true; // visible by default!
}
/// LOG FUNCTIONS /////////////////////////////////////////////////////
/**
* Add an entry to the log table.
*
* Add an entry to the log table. These are "action" focussed rather
* than web server hits, and provide a way to easily reconstruct what
* any particular student has been doing.
*
* @uses $CFG
* @uses $USER
* @uses $db
* @uses $REMOTE_ADDR
* @uses SITEID
* @param int $courseid The course id
* @param string $module The module name - e.g. forum, journal, resource, course, user etc
* @param string $action 'view', 'update', 'add' or 'delete', possibly followed by another word to clarify.
* @param string $url The file and parameters used to see the results of the action
* @param string $info Additional description information
* @param string $cm The course_module->id if there is one
* @param string $user If log regards $user other than $USER
*/
function add_to_log($courseid, $module, $action, $url='', $info='', $cm=0, $user=0) {
// Note that this function intentionally does not follow the normal Moodle DB access idioms.
// This is for a good reason: it is the most frequently used DB update function,
// so it has been optimised for speed.
global $db, $CFG, $USER;
if ($cm === '' || is_null($cm)) { // postgres won't translate empty string to its default
$cm = 0;
}
if ($user) {
$userid = $user;
} else {
if (!empty($USER->realuser)) { // Don't log
return;
}
$userid = empty($USER->id) ? '0' : $USER->id;
}
$REMOTE_ADDR = getremoteaddr();
$timenow = time();
$info = addslashes($info);
if (!empty($url)) { // could break doing html_entity_decode on an empty var.
$url = html_entity_decode($url); // for php < 4.3.0 this is defined in moodlelib.php
}
if (defined('MDL_PERFDB')) { global $PERF ; $PERF->dbqueries++; $PERF->logwrites++;};
if ($CFG->type = 'oci8po') {
if (empty($info)) {
$info = ' ';
}
}
$result = $db->Execute('INSERT INTO '. $CFG->prefix .'log (time, userid, course, ip, module, cmid, action, url, info)
VALUES (' . "'$timenow', '$userid', '$courseid', '$REMOTE_ADDR', '$module', '$cm', '$action', '$url', '$info')");
if (!$result and debugging()) {
echo '<p>Error: Could not insert a new entry to the Moodle log</p>'; // Don't throw an error
}
/// Store lastaccess times for the current user, do not use in cron and other commandline scripts
if (!empty($USER->id) && ($userid == $USER->id) && !defined('FULLME')) {
$db->Execute('UPDATE '. $CFG->prefix .'user
SET lastip=\''. $REMOTE_ADDR .'\', lastaccess=\''. $timenow .'\'
WHERE id = \''. $userid .'\' ');
if ($courseid != SITEID && !empty($courseid)) {
if (defined('MDL_PERFDB')) { global $PERF ; $PERF->dbqueries++;};
if ($record = get_record('user_lastaccess', 'userid', $userid, 'courseid', $courseid)) {
$record->timeaccess = $timenow;
return update_record('user_lastaccess', $record);
} else {
$record = new object;
$record->userid = $userid;
$record->courseid = $courseid;
$record->timeaccess = $timenow;
return insert_record('user_lastaccess', $record);
}
}
}
}
/**
* Select all log records based on SQL criteria
*
* @uses $CFG
* @param string $select SQL select criteria
* @param string $order SQL order by clause to sort the records returned
* @param string $limitfrom ?
* @param int $limitnum ?
* @param int $totalcount Passed in by reference.
* @return object
* @todo Finish documenting this function
*/
function get_logs($select, $order='l.time DESC', $limitfrom='', $limitnum='', &$totalcount) {
global $CFG;
if ($order) {
$order = 'ORDER BY '. $order;
}
$selectsql = $CFG->prefix .'log l LEFT JOIN '. $CFG->prefix .'user u ON l.userid = u.id '. ((strlen($select) > 0) ? 'WHERE '. $select : '');
$countsql = $CFG->prefix.'log l '.((strlen($select) > 0) ? ' WHERE '. $select : '');
$totalcount = count_records_sql("SELECT COUNT(*) FROM $countsql");
return get_records_sql('SELECT l.*, u.firstname, u.lastname, u.picture
FROM '. $selectsql .' '. $order, $limitfrom, $limitnum) ;
}
/**
* Select all log records for a given course and user
*
* @uses $CFG
* @uses DAYSECS
* @param int $userid The id of the user as found in the 'user' table.
* @param int $courseid The id of the course as found in the 'course' table.
* @param string $coursestart ?
* @todo Finish documenting this function
*/
function get_logs_usercourse($userid, $courseid, $coursestart) {
global $CFG;
if ($courseid) {
$courseselect = ' AND course = \''. $courseid .'\' ';
} else {
$courseselect = '';
}
return get_records_sql("SELECT floor((time - $coursestart)/". DAYSECS .") as day, count(*) as num
FROM {$CFG->prefix}log
WHERE userid = '$userid'
AND time > '$coursestart' $courseselect
GROUP BY day ");
}
/**
* Select all log records for a given course, user, and day
*
* @uses $CFG
* @uses HOURSECS
* @param int $userid The id of the user as found in the 'user' table.
* @param int $courseid The id of the course as found in the 'course' table.
* @param string $daystart ?
* @return object
* @todo Finish documenting this function
*/
function get_logs_userday($userid, $courseid, $daystart) {
global $CFG;
if ($courseid) {
$courseselect = ' AND course = \''. $courseid .'\' ';
} else {
$courseselect = '';
}
return get_records_sql("SELECT floor((time - $daystart)/". HOURSECS .") as hour, count(*) as num
FROM {$CFG->prefix}log
WHERE userid = '$userid'
AND time > '$daystart' $courseselect
GROUP BY hour ");
}
/**
* Returns an object with counts of failed login attempts
*
* Returns information about failed login attempts. If the current user is
* an admin, then two numbers are returned: the number of attempts and the
* number of accounts. For non-admins, only the attempts on the given user
* are shown.
*
* @param string $mode Either 'admin', 'teacher' or 'everybody'
* @param string $username The username we are searching for
* @param string $lastlogin The date from which we are searching
* @return int
*/
function count_login_failures($mode, $username, $lastlogin) {
$select = 'module=\'login\' AND action=\'error\' AND time > '. $lastlogin;
if (has_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM, SITEID))) { // Return information about all accounts
if ($count->attempts = count_records_select('log', $select)) {
$count->accounts = count_records_select('log', $select, 'COUNT(DISTINCT info)');
return $count;
}
} else if ($mode == 'everybody' or ($mode == 'teacher' and isteacherinanycourse())) {
if ($count->attempts = count_records_select('log', $select .' AND info = \''. $username .'\'')) {
return $count;
}
}
return NULL;
}
/// GENERAL HELPFUL THINGS ///////////////////////////////////
/**
* Dump a given object's information in a PRE block.
*
* Mostly just used for debugging.
*
* @param mixed $object The data to be printed
*/
function print_object($object) {
echo '<pre class="notifytiny">' . htmlspecialchars(print_r($object,true)) . '</pre>';
}
function course_parent_visible($course = null) {
global $CFG;
if (empty($course)) {
return true;
}
if (!empty($CFG->allowvisiblecoursesinhiddencategories)) {
return true;
}
return category_parent_visible($course->category);
}
function category_parent_visible($parent = 0) {
static $visible;
if (!$parent) {
return true;
}
if (empty($visible)) {
$visible = array(); // initialize
}
if (array_key_exists($parent,$visible)) {
return $visible[$parent];
}
$category = get_record('course_categories', 'id', $parent);
$list = explode('/', preg_replace('/^\/(.*)$/', '$1', $category->path));
$list[] = $parent;
$parents = get_records_list('course_categories', 'id', implode(',', $list), 'depth DESC');
$v = true;
foreach ($parents as $p) {
if (!$p->visible) {
$v = false;
}
}
$visible[$parent] = $v; // now cache it
return $v;
}
/**
* This function is the official hook inside XMLDB stuff to delegate its debug to one
* external function.
*
* Any script can avoid calls to this function by defining XMLDB_SKIP_DEBUG_HOOK before
* using XMLDB classes. Obviously, also, if this function doesn't exist, it isn't invoked ;-)
*
* @param $message string contains the error message
* @param $object object XMLDB object that fired the debug
*/
function xmldb_debug($message, $object) {
error_log($message);
}
/**
* Get the lists of courses the current user has $cap capability in
* I am not sure if this is needed, it loops through all courses so
* could cause performance problems.
* If it's not used, we can use a faster function to detect
* capability in restorelib.php
* @param string $cap
* @return array
*/
function get_capability_courses($cap) {
global $USER;
$mycourses = array();
if ($courses = get_records('course')) {
foreach ($courses as $course) {
if (has_capability($cap, get_context_instance(CONTEXT_COURSE, $course->id))) {
$mycourses[] = $course->id;
}
}
}
return $mycourses;
}
/**
* true or false function to see if user can create any courses at all
* @return bool
*/
function user_can_create_courses() {
global $USER;
// if user has course creation capability at any site or course cat, then return true;
if (has_capability('moodle/course:create', get_context_instance(CONTEXT_SYSTEM, SITEID))) {
return true;
} else {
return (bool) count(get_creatable_categories());
}
}
/**
* get the list of categories the current user can create courses in
* @return array
*/
function get_creatable_categories() {
$creatablecats = array();
if ($cats = get_records('course_categories')) {
foreach ($cats as $cat) {
if (has_capability('moodle/course:create', get_context_instance(CONTEXT_COURSECAT, $cat->id))) {
$creatablecats[$cat->id] = $cat->name;
}
}
}
return $creatablecats;
}
// vim:autoindent:expandtab:shiftwidth=4:tabstop=4:tw=140:
?>
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