moodle/userpix/index.php

<?php
  // This simple script displays all the users with pictures on one page.
  // By default it is not linked anywhere on the site.  If you want to
  // make it available you should link it in yourself from somewhere.
  // Remember also to comment or delete the lines restricting access
  // to administrators only (see below)


require('../config.php');

$PAGE->set_url('/userpix/index.php');

require_login();

/// Remove the following three lines if you want everyone to access it
require_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM));

$title = get_string("users");

$PAGE->navbar->add($title);
$PAGE->set_title($title);
$PAGE->set_heading($title);
echo $OUTPUT->header();

$rs = $DB->get_recordset_select("user", "deleted = 0 AND picture > 0", array(), "lastaccess DESC", user_picture::fields());
foreach ($rs as $user) {
    $fullname = fullname($user);
    echo "<a href=\"$CFG->wwwroot/user/view.php?id=$user->id&amp;course=1\" ".
         "title=\"$fullname\">";
    require_once($CFG->libdir.'/filelib.php');
    echo $OUTPUT->user_picture($user);
    echo "</a> \n";
}
$rs->close();

echo $OUTPUT->footer();