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datalib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Library of functions for database manipulation.
*
* Other main libraries:
* - weblib.php - functions that produce web output
* - moodlelib.php - general-purpose Moodle functions
*
* @package core
* @subpackage lib
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* The maximum courses in a category
* MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
*/
define('MAX_COURSES_IN_CATEGORY', 10000);
/**
* The maximum number of course categories
* MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
*/
define('MAX_COURSE_CATEGORIES', 10000);
/**
* Number of seconds to wait before updating lastaccess information in DB.
*/
define('LASTACCESS_UPDATE_SECS', 60);
/**
* Returns $user object of the main admin user
* primary admin = admin with lowest role_assignment id among admins
*
* @global object
* @static object $myadmin
* @return object An associative array representing the admin user.
*/
function get_admin() {
static $mainadmin = null;
if (!isset($mainadmin)) {
if (! $admins = get_admins()) {
return false;
}
//TODO: add some admin setting for specifying of THE main admin
// for now return the first assigned admin
$mainadmin = reset($admins);
}
return $mainadmin;
}
/**
* Returns list of all admins, using 1 DB query
*
* @return array
*/
function get_admins() {
global $DB, $CFG;
if (empty($CFG->siteadmins)) { // Should not happen on an ordinary site
return array();
}
$sql = "SELECT u.*
FROM {user} u
WHERE u.deleted = 0 AND u.id IN ($CFG->siteadmins)";
return $DB->get_records_sql($sql);
}
/**
* Search through course users
*
* If $coursid specifies the site course then this function searches
* through all undeleted and confirmed users
*
* @global object
* @uses SITEID
* @uses SQL_PARAMS_NAMED
* @uses CONTEXT_COURSE
* @param int $courseid The course in question.
* @param int $groupid The group in question.
* @param string $searchtext The string to search for
* @param string $sort A field to sort by
* @param array $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
* @return array
*/
function search_users($courseid, $groupid, $searchtext, $sort='', array $exceptions=null) {
global $DB;
$fullname = $DB->sql_fullname('u.firstname', 'u.lastname');
if (!empty($exceptions)) {
list($exceptions, $params) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex0000', false);
$except = "AND u.id $exceptions";
} else {
$except = "";
$params = array();
}
if (!empty($sort)) {
$order = "ORDER BY $sort";
} else {
$order = "";
}
$select = "u.deleted = 0 AND u.confirmed = 1 AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('u.email', ':search2', false).")";
$params['search1'] = "%$searchtext%";
$params['search2'] = "%$searchtext%";
if (!$courseid or $courseid == SITEID) {
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
WHERE $select
$except
$order";
return $DB->get_records_sql($sql, $params);
} else {
if ($groupid) {
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
JOIN {groups_members} gm ON gm.userid = u.id
WHERE $select AND gm.groupid = :groupid
$except
$order";
$params['groupid'] = $groupid;
return $DB->get_records_sql($sql, $params);
} else {
$context = get_context_instance(CONTEXT_COURSE, $courseid);
$contextlists = get_related_contexts_string($context);
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
JOIN {role_assignments} ra ON ra.userid = u.id
WHERE $select AND ra.contextid $contextlists
$except
$order";
return $DB->get_records_sql($sql, $params);
}
}
}
/**
* Returns a subset of users
*
* @global object
* @uses DEBUG_DEVELOPER
* @uses SQL_PARAMS_NAMED
* @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 $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 Users whose first name starts with $firstinitial
* @param string $lastinitial Users whose last name starts with $lastinitial
* @param string $page The page or records to return
* @param string $recordsperpage The number of records to return per page
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @return array|int|bool {@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, array $exceptions=null, $sort='firstname ASC',
$firstinitial='', $lastinitial='', $page='', $recordsperpage='', $fields='*', $extraselect='', array $extraparams=null) {
global $DB, $CFG;
if ($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);
}
$fullname = $DB->sql_fullname();
$select = " id <> :guestid AND deleted = 0";
$params = array('guestid'=>$CFG->siteguest);
if (!empty($search)){
$search = trim($search);
$select .= " AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('email', ':search2', false)." OR username = :search3)";
$params['search1'] = "%$search%";
$params['search2'] = "%$search%";
$params['search3'] = "$search";
}
if ($confirmed) {
$select .= " AND confirmed = 1";
}
if ($exceptions) {
list($exceptions, $eparams) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex0000', false);
$params = $params + $eparams;
$except = " AND id $exceptions";
}
if ($firstinitial) {
$select .= " AND ".$DB->sql_like('firstname', ':fni', false, false);
$params['fni'] = "$firstinitial%";
}
if ($lastinitial) {
$select .= " AND ".$DB->sql_like('lastname', ':lni', false, false);
$params['lni'] = "$lastinitial%";
}
if ($extraselect) {
$select .= " AND $extraselect";
$params = $params + (array)$extraparams;
}
if ($get) {
return $DB->get_records_select('user', $select, $params, $sort, $fields, $page, $recordsperpage);
} else {
return $DB->count_records_select('user', $select, $params);
}
}
/**
* @todo Finish documenting this function
*
* @param string $sort An SQL field to sort by
* @param string $dir The sort direction ASC|DESC
* @param int $page The page or records to return
* @param int $recordsperpage The number of records to return per page
* @param string $search A simple string to search for
* @param string $firstinitial Users whose first name starts with $firstinitial
* @param string $lastinitial Users whose last name starts with $lastinitial
* @param string $extraselect An additional SQL select statement to append to the query
* @param array $extraparams Additional parameters to use for the above $extraselect
* @return array Array of {@link $USER} records
*/
function get_users_listing($sort='lastaccess', $dir='ASC', $page=0, $recordsperpage=0,
$search='', $firstinitial='', $lastinitial='', $extraselect='', array $extraparams=null) {
global $DB;
$fullname = $DB->sql_fullname();
$select = "deleted <> 1";
$params = array();
if (!empty($search)) {
$search = trim($search);
$select .= " AND (". $DB->sql_like($fullname, ':search1', false, false).
" OR ". $DB->sql_like('email', ':search2', false, false).
" OR username = :search3)";
$params['search1'] = "%$search%";
$params['search2'] = "%$search%";
$params['search3'] = "$search";
}
if ($firstinitial) {
$select .= " AND ". $DB->sql_like('firstname', ':fni', false, false);
$params['fni'] = "$firstinitial%";
}
if ($lastinitial) {
$select .= " AND ". $DB->sql_like('lastname', ':lni', false, false);
$params['lni'] = "$lastinitial%";
}
if ($extraselect) {
$select .= " AND $extraselect";
$params = $params + (array)$extraparams;
}
if ($sort) {
$sort = " ORDER BY $sort $dir";
}
/// warning: will return UNCONFIRMED USERS
return $DB->get_records_sql("SELECT id, username, email, firstname, lastname, city, country, lastaccess, confirmed, mnethostid
FROM {user}
WHERE $select
$sort", $params, $page, $recordsperpage);
}
/**
* Full list of users that have confirmed their accounts.
*
* @global object
* @return array of unconfirmed users
*/
function get_users_confirmed() {
global $DB, $CFG;
return $DB->get_records_sql("SELECT *
FROM {user}
WHERE confirmed = 1 AND deleted = 0 AND id <> ?", array($CFG->siteguest));
}
/// OTHER SITE AND COURSE FUNCTIONS /////////////////////////////////////////////
/**
* Returns $course object of the top-level site.
*
* @return object A {@link $COURSE} object for the site, exception if not found
*/
function get_site() {
global $SITE, $DB;
if (!empty($SITE->id)) { // We already have a global to use, so return that
return $SITE;
}
if ($course = $DB->get_record('course', array('category'=>0))) {
return $course;
} else {
// course table exists, but the site is not there,
// unfortunately there is no automatic way to recover
throw new moodle_exception('nosite', 'error');
}
}
/**
* 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
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @param string|int $categoryid Either a category id or 'all' for everything
* @param string $sort A field and direction to sort by
* @param string $fields The additional fields to return
* @return array Array of courses
*/
function get_courses($categoryid="all", $sort="c.sortorder ASC", $fields="c.*") {
global $USER, $CFG, $DB;
$params = array();
if ($categoryid !== "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = :catid";
$params['catid'] = $categoryid;
} else {
$categoryselect = "";
}
if (empty($sort)) {
$sortstatement = "";
} else {
$sortstatement = "ORDER BY $sort";
}
$visiblecourses = array();
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT $fields $ccselect
FROM {course} c
$ccjoin
$categoryselect
$sortstatement";
// pull out all course matching the cat
if ($courses = $DB->get_records_sql($sql, $params)) {
// loop throught them
foreach ($courses as $course) {
context_instance_preload($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->id] = $course;
}
} else {
$visiblecourses [$course->id] = $course;
}
}
}
return $visiblecourses;
}
/**
* 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
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @param string|int $categoryid Either a category id or 'all' for everything
* @param string $sort A field and direction to sort by
* @param string $fields The additional fields to return
* @param int $totalcount Reference for the number of courses
* @param string $limitfrom The course to start from
* @param string $limitnum The number of courses to limit to
* @return array Array of courses
*/
function get_courses_page($categoryid="all", $sort="c.sortorder ASC", $fields="c.*",
&$totalcount, $limitfrom="", $limitnum="") {
global $USER, $CFG, $DB;
$params = array();
$categoryselect = "";
if ($categoryid != "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = :catid";
$params['catid'] = $categoryid;
} else {
$categoryselect = "";
}
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT $fields $ccselect
FROM {course} c
$ccjoin
$categoryselect
ORDER BY $sort";
// pull out all course matching the cat
if (!$rs = $DB->get_recordset_sql($sql, $params)) {
return array();
}
$totalcount = 0;
if (!$limitfrom) {
$limitfrom = 0;
}
// iteration will have to be done inside loop to keep track of the limitfrom and limitnum
$visiblecourses = array();
foreach($rs as $course) {
context_instance_preload($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 > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
$visiblecourses [$course->id] = $course;
}
}
} else {
$totalcount++;
if ($totalcount > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
$visiblecourses [$course->id] = $course;
}
}
}
$rs->close();
return $visiblecourses;
}
/**
* Retrieve course records with the course managers and other related records
* that we need for print_course(). This allows print_courses() to do its job
* in a constant number of DB queries, regardless of the number of courses,
* role assignments, etc.
*
* The returned array is indexed on c.id, and each course will have
* - $course->managers - array containing RA objects that include a $user obj
* with the minimal fields needed for fullname()
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @uses CONTEXT_SYSTEM
* @uses CONTEXT_COURSECAT
* @uses SITEID
* @param int|string $categoryid Either the categoryid for the courses or 'all'
* @param string $sort A SQL sort field and direction
* @param array $fields An array of additional fields to fetch
* @return array
*/
function get_courses_wmanagers($categoryid=0, $sort="c.sortorder ASC", $fields=array()) {
/*
* The plan is to
*
* - Grab the courses JOINed w/context
*
* - Grab the interesting course-manager RAs
* JOINed with a base user obj and add them to each course
*
* So as to do all the work in 2 DB queries. The RA+user JOIN
* ends up being pretty expensive if it happens over _all_
* courses on a large site. (Are we surprised!?)
*
* So this should _never_ get called with 'all' on a large site.
*
*/
global $USER, $CFG, $DB;
$params = array();
$allcats = false; // bool flag
if ($categoryid === 'all') {
$categoryclause = '';
$allcats = true;
} elseif (is_numeric($categoryid)) {
$categoryclause = "c.category = :catid";
$params['catid'] = $categoryid;
} else {
debugging("Could not recognise categoryid = $categoryid");
$categoryclause = '';
}
$basefields = array('id', 'category', 'sortorder',
'shortname', 'fullname', 'idnumber',
'startdate', 'visible',
'newsitems', 'groupmode', 'groupmodeforce');
if (!is_null($fields) && is_string($fields)) {
if (empty($fields)) {
$fields = $basefields;
} else {
// turn the fields from a string to an array that
// get_user_courses_bycap() will like...
$fields = explode(',',$fields);
$fields = array_map('trim', $fields);
$fields = array_unique(array_merge($basefields, $fields));
}
} elseif (is_array($fields)) {
$fields = array_merge($basefields,$fields);
}
$coursefields = 'c.' .join(',c.', $fields);
if (empty($sort)) {
$sortstatement = "";
} else {
$sortstatement = "ORDER BY $sort";
}
$where = 'WHERE c.id != ' . SITEID;
if ($categoryclause !== ''){
$where = "$where AND $categoryclause";
}
// pull out all courses matching the cat
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT $coursefields $ccselect
FROM {course} c
$ccjoin
$where
$sortstatement";
$catpaths = array();
$catpath = NULL;
if ($courses = $DB->get_records_sql($sql, $params)) {
// loop on courses materialising
// the context, and prepping data to fetch the
// managers efficiently later...
foreach ($courses as $k => $course) {
context_instance_preload($course);
$coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
$courses[$k] = $course;
$courses[$k]->managers = array();
if ($allcats === false) {
// single cat, so take just the first one...
if ($catpath === NULL) {
$catpath = preg_replace(':/\d+$:', '', $coursecontext->path);
}
} else {
// chop off the contextid of the course itself
// like dirname() does...
$catpaths[] = preg_replace(':/\d+$:', '', $coursecontext->path);
}
}
} else {
return array(); // no courses!
}
$CFG->coursecontact = trim($CFG->coursecontact);
if (empty($CFG->coursecontact)) {
return $courses;
}
$managerroles = explode(',', $CFG->coursecontact);
$catctxids = '';
if (count($managerroles)) {
if ($allcats === true) {
$catpaths = array_unique($catpaths);
$ctxids = array();
foreach ($catpaths as $cpath) {
$ctxids = array_merge($ctxids, explode('/',substr($cpath,1)));
}
$ctxids = array_unique($ctxids);
$catctxids = implode( ',' , $ctxids);
unset($catpaths);
unset($cpath);
} else {
// take the ctx path from the first course
// as all categories will be the same...
$catpath = substr($catpath,1);
$catpath = preg_replace(':/\d+$:','',$catpath);
$catctxids = str_replace('/',',',$catpath);
}
if ($categoryclause !== '') {
$categoryclause = "AND $categoryclause";
}
/*
* Note: Here we use a LEFT OUTER JOIN that can
* "optionally" match to avoid passing a ton of context
* ids in an IN() clause. Perhaps a subselect is faster.
*
* In any case, this SQL is not-so-nice over large sets of
* courses with no $categoryclause.
*
*/
$sql = "SELECT ctx.path, ctx.instanceid, ctx.contextlevel,
r.id AS roleid, r.name as rolename,
u.id AS userid, u.firstname, u.lastname
FROM {role_assignments} ra
JOIN {context} ctx ON ra.contextid = ctx.id
JOIN {user} u ON ra.userid = u.id
JOIN {role} r ON ra.roleid = r.id
LEFT OUTER JOIN {course} c
ON (ctx.instanceid=c.id AND ctx.contextlevel=".CONTEXT_COURSE.")
WHERE ( c.id IS NOT NULL";
// under certain conditions, $catctxids is NULL
if($catctxids == NULL){
$sql .= ") ";
}else{
$sql .= " OR ra.contextid IN ($catctxids) )";
}
$sql .= "AND ra.roleid IN ({$CFG->coursecontact})
$categoryclause
ORDER BY r.sortorder ASC, ctx.contextlevel ASC, ra.sortorder ASC";
$rs = $DB->get_recordset_sql($sql, $params);
// This loop is fairly stupid as it stands - might get better
// results doing an initial pass clustering RAs by path.
foreach($rs as $ra) {
$user = new stdClass;
$user->id = $ra->userid; unset($ra->userid);
$user->firstname = $ra->firstname; unset($ra->firstname);
$user->lastname = $ra->lastname; unset($ra->lastname);
$ra->user = $user;
if ($ra->contextlevel == CONTEXT_SYSTEM) {
foreach ($courses as $k => $course) {
$courses[$k]->managers[] = $ra;
}
} else if ($ra->contextlevel == CONTEXT_COURSECAT) {
if ($allcats === false) {
// It always applies
foreach ($courses as $k => $course) {
$courses[$k]->managers[] = $ra;
}
} else {
foreach ($courses as $k => $course) {
$coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
// Note that strpos() returns 0 as "matched at pos 0"
if (strpos($coursecontext->path, $ra->path.'/') === 0) {
// Only add it to subpaths
$courses[$k]->managers[] = $ra;
}
}
}
} else { // course-level
if (!array_key_exists($ra->instanceid, $courses)) {
//this course is not in a list, probably a frontpage course
continue;
}
$courses[$ra->instanceid]->managers[] = $ra;
}
}
$rs->close();
}
return $courses;
}
/**
* A list of courses that match a search
*
* @global object
* @global object
* @param array $searchterms An array of search criteria
* @param string $sort A field and direction to sort by
* @param int $page The page number to get
* @param int $recordsperpage The number of records per page
* @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, $DB;
if ($DB->sql_regex_supported()) {
$REGEXP = $DB->sql_regex(true);
$NOTREGEXP = $DB->sql_regex(false);
}
$searchcond = array();
$params = array();
$i = 0;
$concat = $DB->sql_concat('c.summary', "' '", 'c.fullname');
foreach ($searchterms as $searchterm) {
$i++;
$NOT = false; /// Initially we aren't going to perform NOT LIKE searches, only MSSQL and Oracle
/// will use it to simulate the "-" operator with LIKE clause
/// Under Oracle and MSSQL, trim the + and - operators and perform
/// simpler LIKE (or NOT LIKE) queries
if (!$DB->sql_regex_supported()) {
if (substr($searchterm, 0, 1) == '-') {
$NOT = true;
}
$searchterm = trim($searchterm, '+-');
}
// TODO: +- may not work for non latin languages
if (substr($searchterm,0,1) == '+') {
$searchterm = trim($searchterm, '+-');
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "$concat $REGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else if (substr($searchterm,0,1) == "-") {
$searchterm = trim($searchterm, '+-');
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "$concat $NOTREGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else {
$searchcond[] = $DB->sql_like($concat,":ss$i", false, true, $NOT);
$params['ss'.$i] = "%$searchterm%";
}
}
if (empty($searchcond)) {
$totalcount = 0;
return array();
}
$searchcond = implode(" AND ", $searchcond);
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT c.* $ccselect
FROM {course} c
$ccjoin
WHERE $searchcond AND c.id <> ".SITEID."
ORDER BY $sort";
$courses = array();
$c = 0; // counts how many visible courses we've seen
if ($rs = $DB->get_recordset_sql($sql, $params)) {
// Tiki pagination
$limitfrom = $page * $recordsperpage;
$limitto = $limitfrom + $recordsperpage;
foreach($rs as $course) {
context_instance_preload($course);
$coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
if ($course->visible || has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
// Don't exit this loop till the end
// we need to count all the visible courses
// to update $totalcount
if ($c >= $limitfrom && $c < $limitto) {
$courses[$course->id] = $course;
}
$c++;
}
}
$rs->close();
}
// our caller expects 2 bits of data - our return
// array, and an updated $totalcount
$totalcount = $c;
return $courses;
}
/**
* Returns a sorted list of categories. Each category object has a context
* property that is a context object.
*
* When asking for $parent='none' it will return all the categories, regardless
* of depth. Wheen asking for a specific parent, the default is to return
* a "shallow" resultset. Pass false to $shallow and it will return all
* the child categories as well.
*
* @global object
* @uses CONTEXT_COURSECAT
* @param string $parent The parent category if any
* @param string $sort the sortorder
* @param bool $shallow - set to false to get the children too
* @return array of categories
*/
function get_categories($parent='none', $sort=NULL, $shallow=true) {
global $DB;
if ($sort === NULL) {
$sort = 'ORDER BY cc.sortorder ASC';
} elseif ($sort ==='') {
// leave it as empty
} else {
$sort = "ORDER BY $sort";
}
list($ccselect, $ccjoin) = context_instance_preload_sql('cc.id', CONTEXT_COURSECAT, 'ctx');
if ($parent === 'none') {
$sql = "SELECT cc.* $ccselect
FROM {course_categories} cc
$ccjoin
$sort";
$params = array();
} elseif ($shallow) {
$sql = "SELECT cc.* $ccselect
FROM {course_categories} cc
$ccjoin
WHERE cc.parent=?
$sort";
$params = array($parent);
} else {
$sql = "SELECT cc.* $ccselect
FROM {course_categories} cc
$ccjoin
JOIN {course_categories} ccp
ON (cc.path LIKE ".$DB->sql_concat('ccp.path',"'%'").")
WHERE ccp.id=?
$sort";
$params = array($parent);
}
$categories = array();
if( $rs = $DB->get_recordset_sql($sql, $params) ){
foreach($rs as $cat) {
context_instance_preload($cat);
$catcontext = get_context_instance(CONTEXT_COURSECAT, $cat->id);
if ($cat->visible || has_capability('moodle/category:viewhiddencategories', $catcontext)) {
$categories[$cat->id] = $cat;
}
}
$rs->close();
}
return $categories;
}
/**
* Returns an array of category ids of all the subcategories for a given
* category.
*
* @global object
* @param int $catid - The id of the category whose subcategories we want to find.
* @return array of category ids.
*/
function get_all_subcategories($catid) {
global $DB;
$subcats = array();
if ($categories = $DB->get_records('course_categories', array('parent'=>$catid))) {
foreach ($categories as $cat) {
array_push($subcats, $cat->id);
$subcats = array_merge($subcats, get_all_subcategories($cat->id));
}
}
return $subcats;
}
/**
* Return specified category, default if given does not exist
*
* @global object
* @uses MAX_COURSES_IN_CATEGORY
* @uses CONTEXT_COURSECAT
* @uses SYSCONTEXTID
* @param int $catid course category id
* @return object caregory
*/
function get_course_category($catid=0) {
global $DB;
$category = false;
if (!empty($catid)) {
$category = $DB->get_record('course_categories', array('id'=>$catid));
}
if (!$category) {
// the first category is considered default for now
if ($category = $DB->get_records('course_categories', null, 'sortorder', '*', 0, 1)) {
$category = reset($category);
} else {
$cat = new stdClass();
$cat->name = get_string('miscellaneous');
$cat->depth = 1;
$cat->sortorder = MAX_COURSES_IN_CATEGORY;
$cat->timemodified = time();
$catid = $DB->insert_record('course_categories', $cat);
// make sure category context exists
get_context_instance(CONTEXT_COURSECAT, $catid);
mark_context_dirty('/'.SYSCONTEXTID);
fix_course_sortorder(); // Required to build course_categories.depth and .path.
$category = $DB->get_record('course_categories', array('id'=>$catid));
}
}
return $category;
}
/**
* Fixes course category and course sortorder, also verifies category and course parents and paths.
* (circular references are not fixed)
*
* @global object
* @global object
* @uses MAX_COURSES_IN_CATEGORY
* @uses MAX_COURSE_CATEGORIES
* @uses SITEID
* @uses CONTEXT_COURSE
* @return void
*/
function fix_course_sortorder() {
global $DB, $SITE;
//WARNING: this is PHP5 only code!
if ($unsorted = $DB->get_records('course_categories', array('sortorder'=>0))) {
//move all categories that are not sorted yet to the end
$DB->set_field('course_categories', 'sortorder', MAX_COURSES_IN_CATEGORY*MAX_COURSE_CATEGORIES, array('sortorder'=>0));
}
$allcats = $DB->get_records('course_categories', null, 'sortorder, id', 'id, sortorder, parent, depth, path');
$topcats = array();
$brokencats = array();
foreach ($allcats as $cat) {
$sortorder = (int)$cat->sortorder;
if (!$cat->parent) {
while(isset($topcats[$sortorder])) {
$sortorder++;
}
$topcats[$sortorder] = $cat;
continue;
}
if (!isset($allcats[$cat->parent])) {
$brokencats[] = $cat;
continue;
}
if (!isset($allcats[$cat->parent]->children)) {
$allcats[$cat->parent]->children = array();
}
while(isset($allcats[$cat->parent]->children[$sortorder])) {
$sortorder++;
}
$allcats[$cat->parent]->children[$sortorder] = $cat;
}
unset($allcats);
// add broken cats to category tree
if ($brokencats) {
$defaultcat = reset($topcats);
foreach ($brokencats as $cat) {
$topcats[] = $cat;
}
}
// now walk recursively the tree and fix any problems found
$sortorder = 0;
$fixcontexts = array();
_fix_course_cats($topcats, $sortorder, 0, 0, '', $fixcontexts);
// detect if there are "multiple" frontpage courses and fix them if needed
$frontcourses = $DB->get_records('course', array('category'=>0), 'id');