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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
* @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.
*
* We allow overwrites from config.php, useful to ensure coherence in performance
* tests results.
*
* Note: For web service requests in the external_tokens field, we use a different constant
* webservice::TOKEN_LASTACCESS_UPDATE_SECS.
*/
if (!defined('LASTACCESS_UPDATE_SECS')) {
define('LASTACCESS_UPDATE_SECS', 60);
}
/**
* Returns $user object of the main admin user
*
* @static stdClass $mainadmin
* @return stdClass {@link $USER} record from DB, false if not found
*/
function get_admin() {
global $CFG, $DB;
static $mainadmin = null;
static $prevadmins = null;
if (empty($CFG->siteadmins)) {
// Should not happen on an ordinary site.
// It does however happen during unit tests.
return false;
}
if (isset($mainadmin) and $prevadmins === $CFG->siteadmins) {
return clone($mainadmin);
}
$mainadmin = null;
foreach (explode(',', $CFG->siteadmins) as $id) {
if ($user = $DB->get_record('user', array('id'=>$id, 'deleted'=>0))) {
$mainadmin = $user;
break;
}
}
if ($mainadmin) {
$prevadmins = $CFG->siteadmins;
return clone($mainadmin);
} else {
// this should not happen
return false;
}
}
/**
* 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)";
// We want the same order as in $CFG->siteadmins.
$records = $DB->get_records_sql($sql);
$admins = array();
foreach (explode(',', $CFG->siteadmins) as $id) {
$id = (int)$id;
if (!isset($records[$id])) {
// User does not exist, this should not happen.
continue;
}
$admins[$records[$id]->id] = $records[$id];
}
return $admins;
}
/**
* 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, 'ex', 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 {
$context = context_course::instance($courseid);
// We want to query both the current context and parent contexts.
list($relatedctxsql, $relatedctxparams) = $DB->get_in_or_equal($context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'relatedctx');
$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 $relatedctxsql
$except
$order";
$params = array_merge($params, $relatedctxparams);
return $DB->get_records_sql($sql, $params);
}
}
}
/**
* Returns SQL used to search through user table to find users (in a query
* which may also join and apply other conditions).
*
* You can combine this SQL with an existing query by adding 'AND $sql' to the
* WHERE clause of your query (where $sql is the first element in the array
* returned by this function), and merging in the $params array to the parameters
* of your query (where $params is the second element). Your query should use
* named parameters such as :param, rather than the question mark style.
*
* There are examples of basic usage in the unit test for this function.
*
* @param string $search the text to search for (empty string = find all)
* @param string $u the table alias for the user table in the query being
* built. May be ''.
* @param bool $searchanywhere If true (default), searches in the middle of
* names, otherwise only searches at start
* @param array $extrafields Array of extra user fields to include in search
* @param array $exclude Array of user ids to exclude (empty = don't exclude)
* @param array $includeonly If specified, only returns users that have ids
* incldued in this array (empty = don't restrict)
* @return array an array with two elements, a fragment of SQL to go in the
* where clause the query, and an associative array containing any required
* parameters (using named placeholders).
*/
function users_search_sql($search, $u = 'u', $searchanywhere = true, array $extrafields = array(),
array $exclude = null, array $includeonly = null) {
global $DB, $CFG;
$params = array();
$tests = array();
if ($u) {
$u .= '.';
}
// If we have a $search string, put a field LIKE '$search%' condition on each field.
if ($search) {
$conditions = array(
$DB->sql_fullname($u . 'firstname', $u . 'lastname'),
$conditions[] = $u . 'lastname'
);
foreach ($extrafields as $field) {
$conditions[] = $u . $field;
}
if ($searchanywhere) {
$searchparam = '%' . $search . '%';
} else {
$searchparam = $search . '%';
}
$i = 0;
foreach ($conditions as $key => $condition) {
$conditions[$key] = $DB->sql_like($condition, ":con{$i}00", false, false);
$params["con{$i}00"] = $searchparam;
$i++;
}
$tests[] = '(' . implode(' OR ', $conditions) . ')';
}
// Add some additional sensible conditions.
$tests[] = $u . "id <> :guestid";
$params['guestid'] = $CFG->siteguest;
$tests[] = $u . 'deleted = 0';
$tests[] = $u . 'confirmed = 1';
// If we are being asked to exclude any users, do that.
if (!empty($exclude)) {
list($usertest, $userparams) = $DB->get_in_or_equal($exclude, SQL_PARAMS_NAMED, 'ex', false);
$tests[] = $u . 'id ' . $usertest;
$params = array_merge($params, $userparams);
}
// If we are validating a set list of userids, add an id IN (...) test.
if (!empty($includeonly)) {
list($usertest, $userparams) = $DB->get_in_or_equal($includeonly, SQL_PARAMS_NAMED, 'val');
$tests[] = $u . 'id ' . $usertest;
$params = array_merge($params, $userparams);
}
// In case there are no tests, add one result (this makes it easier to combine
// this with an existing query as you can always add AND $sql).
if (empty($tests)) {
$tests[] = '1 = 1';
}
// Combing the conditions and return.
return array(implode(' AND ', $tests), $params);
}
/**
* This function generates the standard ORDER BY clause for use when generating
* lists of users. If you don't have a reason to use a different order, then
* you should use this method to generate the order when displaying lists of users.
*
* If the optional $search parameter is passed, then exact matches to the search
* will be sorted first. For example, suppose you have two users 'Al Zebra' and
* 'Alan Aardvark'. The default sort is Alan, then Al. If, however, you search for
* 'Al', then Al will be listed first. (With two users, this is not a big deal,
* but with thousands of users, it is essential.)
*
* The list of fields scanned for exact matches are:
* - firstname
* - lastname
* - $DB->sql_fullname
* - those returned by get_extra_user_fields
*
* If named parameters are used (which is the default, and highly recommended),
* then the parameter names are like :usersortexactN, where N is an int.
*
* The simplest possible example use is:
* list($sort, $params) = users_order_by_sql();
* $sql = 'SELECT * FROM {users} ORDER BY ' . $sort;
*
* A more complex example, showing that this sort can be combined with other sorts:
* list($sort, $sortparams) = users_order_by_sql('u');
* $sql = "SELECT g.id AS groupid, gg.groupingid, u.id AS userid, u.firstname, u.lastname, u.idnumber, u.username
* FROM {groups} g
* LEFT JOIN {groupings_groups} gg ON g.id = gg.groupid
* LEFT JOIN {groups_members} gm ON g.id = gm.groupid
* LEFT JOIN {user} u ON gm.userid = u.id
* WHERE g.courseid = :courseid $groupwhere $groupingwhere
* ORDER BY g.name, $sort";
* $params += $sortparams;
*
* An example showing the use of $search:
* list($sort, $sortparams) = users_order_by_sql('u', $search, $this->get_context());
* $order = ' ORDER BY ' . $sort;
* $params += $sortparams;
* $availableusers = $DB->get_records_sql($fields . $sql . $order, $params, $page*$perpage, $perpage);
*
* @param string $usertablealias (optional) any table prefix for the {users} table. E.g. 'u'.
* @param string $search (optional) a current search string. If given,
* any exact matches to this string will be sorted first.
* @param context $context the context we are in. Use by get_extra_user_fields.
* Defaults to $PAGE->context.
* @return array with two elements:
* string SQL fragment to use in the ORDER BY clause. For example, "firstname, lastname".
* array of parameters used in the SQL fragment.
*/
function users_order_by_sql($usertablealias = '', $search = null, context $context = null) {
global $DB, $PAGE;
if ($usertablealias) {
$tableprefix = $usertablealias . '.';
} else {
$tableprefix = '';
}
$sort = "{$tableprefix}lastname, {$tableprefix}firstname, {$tableprefix}id";
$params = array();
if (!$search) {
return array($sort, $params);
}
if (!$context) {
$context = $PAGE->context;
}
$exactconditions = array();
$paramkey = 'usersortexact1';
$exactconditions[] = $DB->sql_fullname($tableprefix . 'firstname', $tableprefix . 'lastname') .
' = :' . $paramkey;
$params[$paramkey] = $search;
$paramkey++;
$fieldstocheck = array_merge(array('firstname', 'lastname'), get_extra_user_fields($context));
foreach ($fieldstocheck as $key => $field) {
$exactconditions[] = 'LOWER(' . $tableprefix . $field . ') = LOWER(:' . $paramkey . ')';
$params[$paramkey] = $search;
$paramkey++;
}
$sort = 'CASE WHEN ' . implode(' OR ', $exactconditions) .
' THEN 0 ELSE 1 END, ' . $sort;
return array($sort, $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, 'ex', false);
$params = $params + $eparams;
$select .= " 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);
}
}
/**
* Return filtered (if provided) list of users in site, except guest and deleted users.
*
* @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
* @param stdClass $extracontext If specified, will include user 'extra fields'
* as appropriate for current user and given context
* @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, $extracontext = null) {
global $DB, $CFG;
$fullname = $DB->sql_fullname();
$select = "deleted <> 1 AND id <> :guestid";
$params = array('guestid' => $CFG->siteguest);
if (!empty($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";
}
// If a context is specified, get extra user fields that the current user
// is supposed to see.
$extrafields = '';
if ($extracontext) {
$extrafields = get_extra_user_fields_sql($extracontext, '', '',
array('id', 'username', 'email', 'firstname', 'lastname', 'city', 'country',
'lastaccess', 'confirmed', 'mnethostid'));
}
$namefields = get_all_user_name_fields(true);
$extrafields = "$extrafields, $namefields";
// warning: will return UNCONFIRMED USERS
return $DB->get_records_sql("SELECT id, username, email, city, country, lastaccess, confirmed, mnethostid, suspended $extrafields
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');
}
}
/**
* Gets a course object from database. If the course id corresponds to an
* already-loaded $COURSE or $SITE object, then the loaded object will be used,
* saving a database query.
*
* If it reuses an existing object, by default the object will be cloned. This
* means you can modify the object safely without affecting other code.
*
* @param int $courseid Course id
* @param bool $clone If true (default), makes a clone of the record
* @return stdClass A course object
* @throws dml_exception If not found in database
*/
function get_course($courseid, $clone = true) {
global $DB, $COURSE, $SITE;
if (!empty($COURSE->id) && $COURSE->id == $courseid) {
return $clone ? clone($COURSE) : $COURSE;
} else if (!empty($SITE->id) && $SITE->id == $courseid) {
return $clone ? clone($SITE) : $SITE;
} else {
return $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
}
}
/**
* 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
*
* Consider using core_course_category::get_courses()
* or core_course_category::search_courses() instead since they use caching.
*
* @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();
$ccselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
$ccjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel)";
$params['contextlevel'] = CONTEXT_COURSE;
$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 $course) {
context_helper::preload_from_record($course);
if (core_course_category::can_view_course_info($course)) {
$visiblecourses [$course->id] = $course;
}
}
}
return $visiblecourses;
}
/**
* 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.
* @param array $requiredcapabilities Extra list of capabilities used to filter courses
* @param array $searchcond additional search conditions, for example ['c.enablecompletion = :p1']
* @param array $params named parameters for additional search conditions, for example ['p1' => 1]
* @return stdClass[] {@link $COURSE} records
*/
function get_courses_search($searchterms, $sort, $page, $recordsperpage, &$totalcount,
$requiredcapabilities = array(), $searchcond = [], $params = []) {
global $CFG, $DB;
if ($DB->sql_regex_supported()) {
$REGEXP = $DB->sql_regex(true);
$NOTREGEXP = $DB->sql_regex(false);
}
$i = 0;
// Thanks Oracle for your non-ansi concat and type limits in coalesce. MDL-29912
if ($DB->get_dbfamily() == 'oracle') {
$concat = "(c.summary|| ' ' || c.fullname || ' ' || c.idnumber || ' ' || c.shortname)";
} else {
$concat = $DB->sql_concat("COALESCE(c.summary, '')", "' '", 'c.fullname', "' '", 'c.idnumber', "' '", 'c.shortname');
}
foreach ($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($searchterm,0,1) == "-") && (core_text::strlen($searchterm) > 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)) {
$searchcond = array('1 = 1');
}
$searchcond = implode(" AND ", $searchcond);
$courses = array();
$c = 0; // counts how many visible courses we've seen
// Tiki pagination
$limitfrom = $page * $recordsperpage;
$limitto = $limitfrom + $recordsperpage;
$ccselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
$ccjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel)";
$params['contextlevel'] = CONTEXT_COURSE;
$sql = "SELECT c.* $ccselect
FROM {course} c
$ccjoin
WHERE $searchcond AND c.id <> ".SITEID."
ORDER BY $sort";
$mycourses = enrol_get_my_courses();
$rs = $DB->get_recordset_sql($sql, $params);
foreach($rs as $course) {
// Preload contexts only for hidden courses or courses we need to return.
context_helper::preload_from_record($course);
$coursecontext = context_course::instance($course->id);
if (!array_key_exists($course->id, $mycourses) && !core_course_category::can_view_course_info($course)) {
continue;
}
if (!empty($requiredcapabilities)) {
if (!has_all_capabilities($requiredcapabilities, $coursecontext)) {
continue;
}
}
// 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;
}
/**
* 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 there are any changes made to courses or categories we will trigger
// the cache events to purge all cached courses/categories data
$cacheevents = array();
if ($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));
$cacheevents['changesincoursecat'] = true;
}
$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;
$fixcontexts = array();
if (_fix_course_cats($topcats, $sortorder, 0, 0, '', $fixcontexts)) {
$cacheevents['changesincoursecat'] = true;
}
// detect if there are "multiple" frontpage courses and fix them if needed
$frontcourses = $DB->get_records('course', array('category'=>0), 'id');
if (count($frontcourses) > 1) {
if (isset($frontcourses[SITEID])) {
$frontcourse = $frontcourses[SITEID];
unset($frontcourses[SITEID]);
} else {
$frontcourse = array_shift($frontcourses);
}
$defaultcat = reset($topcats);
foreach ($frontcourses as $course) {
$DB->set_field('course', 'category', $defaultcat->id, array('id'=>$course->id));
$context = context_course::instance($course->id);
$fixcontexts[$context->id] = $context;
$cacheevents['changesincourse'] = true;
}
unset($frontcourses);
} else {
$frontcourse = reset($frontcourses);
}
// now fix the paths and depths in context table if needed
if ($fixcontexts) {
foreach ($fixcontexts as $fixcontext) {
$fixcontext->reset_paths(false);
}
context_helper::build_all_paths(false);
unset($fixcontexts);
$cacheevents['changesincourse'] = true;
$cacheevents['changesincoursecat'] = true;
}
// release memory
unset($topcats);
unset($brokencats);
unset($fixcontexts);
// fix frontpage course sortorder
if ($frontcourse->sortorder != 1) {
$DB->set_field('course', 'sortorder', 1, array('id'=>$frontcourse->id));
$cacheevents['changesincourse'] = true;
}
// now fix the course counts in category records if needed
$sql = "SELECT cc.id, cc.coursecount, COUNT(c.id) AS newcount
FROM {course_categories} cc
LEFT JOIN {course} c ON c.category = cc.id
GROUP BY cc.id, cc.coursecount
HAVING cc.coursecount <> COUNT(c.id)";
if ($updatecounts = $DB->get_records_sql($sql)) {
// categories with more courses than MAX_COURSES_IN_CATEGORY
$categories = array();
foreach ($updatecounts as $cat) {
$cat->coursecount = $cat->newcount;
if ($cat->coursecount >= MAX_COURSES_IN_CATEGORY) {
$categories[] = $cat->id;
}
unset($cat->newcount);
$DB->update_record_raw('course_categories', $cat, true);
}
if (!empty($categories)) {
$str = implode(', ', $categories);
debugging("The number of courses (category id: $str) has reached MAX_COURSES_IN_CATEGORY (" . MAX_COURSES_IN_CATEGORY . "), it will cause a sorting performance issue, please increase the value of MAX_COURSES_IN_CATEGORY in lib/datalib.php file. See tracker issue: MDL-25669", DEBUG_DEVELOPER);
}
$cacheevents['changesincoursecat'] = true;
}
// now make sure that sortorders in course table are withing the category sortorder ranges
$sql = "SELECT DISTINCT cc.id, cc.sortorder
FROM {course_categories} cc
JOIN {course} c ON c.category = cc.id
WHERE c.sortorder < cc.sortorder OR c.sortorder > cc.sortorder + ".MAX_COURSES_IN_CATEGORY;
if ($fixcategories = $DB->get_records_sql($sql)) {
//fix the course sortorder ranges
foreach ($fixcategories as $cat) {
$sql = "UPDATE {course}
SET sortorder = ".$DB->sql_modulo('sortorder', MAX_COURSES_IN_CATEGORY)." + ?
WHERE category = ?";
$DB->execute($sql, array($cat->sortorder, $cat->id));
}
$cacheevents['changesincoursecat'] = true;
}
unset($fixcategories);
// categories having courses with sortorder duplicates or having gaps in sortorder
$sql = "SELECT DISTINCT c1.category AS id , cc.sortorder
FROM {course} c1
JOIN {course} c2 ON c1.sortorder = c2.sortorder
JOIN {course_categories} cc ON (c1.category = cc.id)
WHERE c1.id <> c2.id";
$fixcategories = $DB->get_records_sql($sql);
$sql = "SELECT cc.id, cc.sortorder, cc.coursecount, MAX(c.sortorder) AS maxsort, MIN(c.sortorder) AS minsort
FROM {course_categories} cc
JOIN {course} c ON c.category = cc.id
GROUP BY cc.id, cc.sortorder, cc.coursecount
HAVING (MAX(c.sortorder) <> cc.sortorder + cc.coursecount) OR (MIN(c.sortorder) <> cc.sortorder + 1)";
$gapcategories = $DB->get_records_sql($sql);
foreach ($gapcategories as $cat) {
if (isset($fixcategories[$cat->id])) {
// duplicates detected already
} else if ($cat->minsort == $cat->sortorder and $cat->maxsort == $cat->sortorder + $cat->coursecount - 1) {
// easy - new course inserted with sortorder 0, the rest is ok
$sql = "UPDATE {course}
SET sortorder = sortorder + 1
WHERE category = ?";
$DB->execute($sql, array($cat->id));
} else {
// it needs full resorting
$fixcategories[$cat->id] = $cat;
}
$cacheevents['changesincourse'] = true;
}
unset($gapcategories);
// fix course sortorders in problematic categories only
foreach ($fixcategories as $cat) {
$i = 1;
$courses = $DB->get_records('course', array('category'=>$cat->id), 'sortorder ASC, id DESC', 'id, sortorder');
foreach ($courses as $course) {
if ($course->sortorder != $cat->sortorder + $i) {
$course->sortorder = $cat->sortorder + $i;
$DB->update_record_raw('course', $course, true);
$cacheevents['changesincourse'] = true;
}
$i++;
}
}
// advise all caches that need to be rebuilt
foreach (array_keys($cacheevents) as $event) {
cache_helper::purge_by_event($event);
}
}
/**
* Internal recursive category verification function, do not use directly!
*
* @todo Document the arguments of this function better
*
* @global object
* @uses MAX_COURSES_IN_CATEGORY
* @uses CONTEXT_COURSECAT
* @param array $children
* @param int $sortorder
* @param string $parent
* @param int $depth
* @param string $path
* @param array $fixcontexts
* @return bool if changes were made
*/
function _fix_course_cats($children, &$sortorder, $parent, $depth, $path, &$fixcontexts) {
global $DB;
$depth++;
$changesmade = false;
foreach ($children as $cat) {
$sortorder = $sortorder + MAX_COURSES_IN_CATEGORY;
$update = false;
if ($parent != $cat->parent or $depth != $cat->depth or $path.'/'.$cat->id != $cat->path) {
$cat->parent = $parent;
$cat->depth = $depth;
$cat->path = $path.'/'.$cat->id;
$update = true;
// make sure context caches are rebuild and dirty contexts marked
$context = context_coursecat::instance($cat->id);
$fixcontexts[$context->id] = $context;
}
if ($cat->sortorder != $sortorder) {
$cat->sortorder = $sortorder;
$update = true;
}
if ($update) {
$DB->update_record('course_categories', $cat, true);
$changesmade = true;
}
if (isset($cat->children)) {
if (_fix_course_cats($cat->children, $sortorder, $cat->id, $cat->depth, $cat->path, $fixcontexts)) {
$changesmade = true;
}
}
}
return $changesmade;
}
/**
* List of remote courses that a user has access to via MNET.
* Works only on the IDP
*
* @global object
* @global object
* @param int @userid The user id to get remote courses for
* @return array Array of {@link $COURSE} of course objects
*/
function get_my_remotecourses($userid=0) {
global $DB, $USER;
if (empty($userid)) {
$userid = $USER->id;
}
// we can not use SELECT DISTINCT + text field (summary) because of MS SQL and Oracle, subselect used therefore
$sql = "SELECT c.id, c.remoteid, c.shortname, c.fullname,
c.hostid, c.summary, c.summaryformat, c.categoryname AS cat_name,
h.name AS hostname
FROM {mnetservice_enrol_courses} c
JOIN (SELECT DISTINCT hostid, remotecourseid
FROM {mnetservice_enrol_enrolments}
WHERE userid = ?
) e ON (e.hostid = c.hostid AND e.remotecourseid = c.remoteid)
JOIN {mnet_host} h ON h.id = c.hostid";
return $DB->get_records_sql($sql, array($userid));
}
/**
* List of remote hosts that a user has access to via MNET.
* Works on the SP
*
* @global object
* @global object
* @return array|bool Array of host objects or false
*/
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;
}
/**
* Returns a menu of all available scales from the site as well as the given course
*
* @global object
* @param int $courseid The id of the course as found in the 'course' table.
* @return array
*/
function get_scales_menu($courseid=0) {
global $DB;
$sql = "SELECT id, name, courseid
FROM {scale}
WHERE courseid = 0 or courseid = ?
ORDER BY courseid ASC, name ASC";
$params = array($courseid);
$scales = array();
$results = $DB->get_records_sql($sql, $params);
foreach ($results as $index => $record) {
$context = empty($record->courseid) ? context_system::instance() : context_course::instance($record->courseid);
$scales[$index] = format_string($record->name, false, ["context" => $context]);
}
// Format: [id => 'scale name'].
return $scales;
}
/**
* Increment standard revision field.
*
* The revision are based on current time and are incrementing.
* There is a protection for runaway revisions, it may not go further than
* one hour into future.
*
* The field has to be XMLDB_TYPE_INTEGER with size 10.
*
* @param string $table
* @param string $field name of the field containing revision
* @param string $select use empty string when updating all records
* @param array $params optional select parameters
*/
function increment_revision_number($table, $field, $select, array $params = null) {
global $DB;
$now = time();
$sql = "UPDATE {{$table}}
SET $field = (CASE
WHEN $field IS NULL THEN $now
WHEN $field < $now THEN $now
WHEN $field > $now + 3600 THEN $now
ELSE $field + 1 END)";
if ($select) {
$sql = $sql . " WHERE $select";
}
$DB->execute($sql, $params);
}
/// MODULE FUNCTIONS /////////////////////////////////////////////////
/**
* Just gets a raw list of all modules in a course
*
* @global object
* @param int $courseid The id of the course as found in the 'course' table.
* @return array
*/
function get_course_mods($courseid) {
global $DB;
if (empty($courseid)) {
return false; // avoid warnings
}
return $DB->get_records_sql("SELECT cm.*, m.name as modname
FROM {modules} m, {course_modules} cm
WHERE cm.course = ? AND cm.module = m.id AND m.visible = 1",
array($courseid)); // no disabled mods
}
/**
* Given an id of a course module, finds the coursemodule description
*
* Please note that this function performs 1-2 DB queries. When possible use cached
* course modinfo. For example get_fast_modinfo($courseorid)->get_cm($cmid)
* See also {@link cm_info::get_course_module_record()}
*
* @global object
* @param string $modulename name of module type, eg. resource, assignment,... (optional, slower and less safe if not specified)
* @param int $cmid course module id (id in course_modules table)
* @param int $courseid optional course id for extra validation
* @param bool $sectionnum include relative section number (0,1,2 ...)
* @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
* IGNORE_MULTIPLE means return first, ignore multiple records found(not recommended);
* MUST_EXIST means throw exception if no record or multiple records found
* @return stdClass
*/
function get_coursemodule_from_id($modulename, $cmid, $courseid=0, $sectionnum=false, $strictness=IGNORE_MISSING) {
global $DB;
$params = array('cmid'=>$cmid);
if (!$modulename) {
if (!$modulename = $DB->get_field_sql("SELECT md.name
FROM {modules} md
JOIN {course_modules} cm ON cm.module = md.id
WHERE cm.id = :cmid", $params, $strictness)) {
return false;
}
} else {
if (!core_component::is_valid_plugin_name('mod', $modulename)) {
throw new coding_exception('Invalid modulename parameter');
}
}
$params['modulename'] = $modulename;
$courseselect = "";
$sectionfield = "";
$sectionjoin = "";
if ($courseid) {
$courseselect = "AND cm.course = :courseid";
$params['courseid'] = $courseid;
}
if ($sectionnum) {
$sectionfield = ", cw.section AS sectionnum";
$sectionjoin = "LEFT JOIN {course_sections} cw ON cw.id = cm.section";
}
$sql = "SELECT cm.*, m.name, md.name AS modname $sectionfield
FROM {course_modules} cm
JOIN {modules} md ON md.id = cm.module
JOIN {".$modulename."} m ON m.id = cm.instance
$sectionjoin
WHERE cm.id = :cmid AND md.name = :modulename
$courseselect";
return $DB->get_record_sql($sql, $params, $strictness);
}
/**
* Given an instance number of a module, finds the coursemodule description
*
* Please note that this function performs DB query. When possible use cached course
* modinfo. For example get_fast_modinfo($courseorid)->instances[$modulename][$instance]
* See also {@link cm_info::get_course_module_record()}
*
* @global object
* @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
* @param bool $sectionnum include relative section number (0,1,2 ...)
* @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
* IGNORE_MULTIPLE means return first, ignore multiple records found(not recommended);
* MUST_EXIST means throw exception if no record or multiple records found
* @return stdClass
*/
function get_coursemodule_from_instance($modulename, $instance, $courseid=0, $sectionnum=false, $strictness=IGNORE_MISSING) {
global $DB;
if (!core_component::is_valid_plugin_name('mod', $modulename)) {
throw new coding_exception('Invalid modulename parameter');
}
$params = array('instance'=>$instance, 'modulename'=>$modulename);
$courseselect = "";
$sectionfield = "";
$sectionjoin = "";
if ($courseid) {
$courseselect = "AND cm.course = :courseid";
$params['courseid'] = $courseid;
}
if ($sectionnum) {
$sectionfield = ", cw.section AS sectionnum";
$sectionjoin = "LEFT JOIN {course_sections} cw ON cw.id = cm.section";
}
$sql = "SELECT cm.*, m.name, md.name AS modname $sectionfield
FROM {course_modules} cm
JOIN {modules} md ON md.id = cm.module
JOIN {".$modulename."} m ON m.id = cm.instance
$sectionjoin
WHERE m.id = :instance AND md.name = :modulename
$courseselect";
return $DB->get_record_sql($sql, $params, $strictness);
}
/**
* Returns all course modules of given activity in course
*
* @param string $modulename The module name (forum, quiz, etc.)
* @param int $courseid The course id to get modules for
* @param string $extrafields extra fields starting with m.
* @return array Array of results
*/
function get_coursemodules_in_course($modulename, $courseid, $extrafields='') {
global $DB;
if (!core_component::is_valid_plugin_name('mod', $modulename)) {
throw new coding_exception('Invalid modulename parameter');
}
if (!empty($extrafields)) {
$extrafields = ", $extrafields";
}
$params = array();
$params['courseid'] = $courseid;
$params['modulename'] = $modulename;
return $DB->get_records_sql("SELECT cm.*, m.name, md.name as modname $extrafields
FROM {course_modules} cm, {modules} md, {".$modulename."} m
WHERE cm.course = :courseid AND
cm.instance = m.id AND
md.name = :modulename AND
md.id = cm.module", $params);
}
/**
* 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 an empty array on any errors.
*
* The returned objects includle the columns cw.section, cm.visible,
* cm.groupmode, and cm.groupingid, and are indexed by cm.id.
*
* @global object
* @global object
* @param string $modulename The name of the module to get instances for
* @param array $courses an array of course objects.
* @param int $userid
* @param int $includeinvisible
* @return array of module instance objects, including some extra fields from the course_modules
* and course_sections tables, or an empty array if an error occurred.
*/
function get_all_instances_in_courses($modulename, $courses, $userid=NULL, $includeinvisible=false) {
global $CFG, $DB;
if (!core_component::is_valid_plugin_name('mod', $modulename)) {
throw new coding_exception('Invalid modulename parameter');
}
$outputarray = array();
if (empty($courses) || !is_array($courses) || count($courses) == 0) {
return $outputarray;
}
list($coursessql, $params) = $DB->get_in_or_equal(array_keys($courses), SQL_PARAMS_NAMED, 'c0');
$params['modulename'] = $modulename;
if (!$rawmods = $DB->get_records_sql("SELECT cm.id AS coursemodule, m.*, cw.section, cm.visible AS visible,
cm.groupmode, cm.groupingid
FROM {course_modules} cm, {course_sections} cw, {modules} md,
{".$modulename."} m
WHERE cm.course $coursessql AND
cm.instance = m.id AND
cm.section = cw.id AND
md.name = :modulename AND
md.id = cm.module", $params)) {
return $outputarray;
}
foreach ($courses as $course) {
$modinfo = get_fast_modinfo($course, $userid);
if (empty($modinfo->instances[$modulename])) {
continue;
}
foreach ($modinfo->instances[$modulename] as $cm) {
if (!$includeinvisible and !$cm->uservisible) {
continue;
}
if (!isset($rawmods[$cm->id])) {
continue;
}
$instance = $rawmods[$cm->id];
if (!empty($cm->extra)) {
$instance->extra = $cm->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 an empty array on any errors.
*
* The returned objects includle the columns cw.section, cm.visible,
* cm.groupmode, and cm.groupingid, and are indexed by cm.id.
*
* Simply calls {@link all_instances_in_courses()} with a single provided course
*
* @param string $modulename The name of the module to get instances for
* @param object $course The course obect.
* @return array of module instance objects, including some extra fields from the course_modules
* and course_sections tables, or an empty array if an error occurred.
* @param int $userid
* @param int $includeinvisible
*/
function get_all_instances_in_course($modulename, $course, $userid=NULL, $includeinvisible=false) {
return get_all_instances_in_courses($modulename, array($course->id => $course), $userid, $includeinvisible);
}
/**
* 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 according to the 'eye' icon only.
*
* NOTE: This does NOT take into account visibility to a particular user.
* To get visibility access for a specific user, use get_fast_modinfo, get a
* cm_info object from this, and check the ->uservisible property; or use
* the \core_availability\info_module::is_user_visible() static function.
*
* @global object
* @param $moduletype Name of the module eg 'forum'
* @param $module Object which is the instance of the module
* @return bool Success
*/
function instance_is_visible($moduletype, $module) {
global $DB;
if (!empty($module->id)) {
$params = array('courseid'=>$module->course, 'moduletype'=>$moduletype, 'moduleid'=>$module->id);
if ($records = $DB->get_records_sql("SELECT cm.instance, cm.visible, cm.groupingid, cm.id, cm.course
FROM {course_modules} cm, {modules} m
WHERE cm.course = :courseid AND
cm.module = m.id AND
m.name = :moduletype AND
cm.instance = :moduleid", $params)) {
foreach ($records as $record) { // there should only be one - use the first one
return $record->visible;
}
}
}
return true; // visible by default!
}
/// LOG FUNCTIONS /////////////////////////////////////////////////////
/**
* Get instance of log manager.
*
* @param bool $forcereload
* @return \core\log\manager
*/
function get_log_manager($forcereload = false) {
/** @var \core\log\manager $singleton */
static $singleton = null;
if ($forcereload and isset($singleton)) {
$singleton->dispose();
$singleton = null;
}
if (isset($singleton)) {
return $singleton;
}
$classname = '\tool_log\log\manager';
if (defined('LOG_MANAGER_CLASS')) {
$classname = LOG_MANAGER_CLASS;
}
if (!class_exists($classname)) {
if (!empty($classname)) {
debugging("Cannot find log manager class '$classname'.", DEBUG_DEVELOPER);
}
$classname = '\core\log\dummy_manager';
}
$singleton = new $classname();
return $singleton;
}
/**
* Add an entry to the config log table.
*
* These are "action" focussed rather than web server hits,
* and provide a way to easily reconstruct changes to Moodle configuration.
*
* @package core
* @category log
* @global moodle_database $DB
* @global stdClass $USER
* @param string $name The name of the configuration change action
For example 'filter_active' when activating or deactivating a filter
* @param string $oldvalue The config setting's previous value
* @param string $value The config setting's new value
* @param string $plugin Plugin name, for example a filter name when changing filter configuration
* @return void
*/
function add_to_config_log($name, $oldvalue, $value, $plugin) {
global $USER, $DB;
$log = new stdClass();
// Use 0 as user id during install.
$log->userid = during_initial_install() ? 0 : $USER->id;
$log->timemodified = time();
$log->name = $name;
$log->oldvalue = $oldvalue;
$log->value = $value;
$log->plugin = $plugin;
$id = $DB->insert_record('config_log', $log);
$event = core\event\config_log_created::create(array(
'objectid' => $id,
'userid' => $log->userid,
'context' => \context_system::instance(),
'other' => array(
'name' => $log->name,
'oldvalue' => $log->oldvalue,
'value' => $log->value,
'plugin' => $log->plugin
)
));
$event->trigger();
}
/**
* Store user last access times - called when use enters a course or site
*
* @package core
* @category log
* @global stdClass $USER
* @global stdClass $CFG
* @global moodle_database $DB
* @uses LASTACCESS_UPDATE_SECS
* @uses SITEID
* @param int $courseid empty courseid means site
* @return void
*/
function user_accesstime_log($courseid=0) {
global $USER, $CFG, $DB;
if (!isloggedin() or \core\session\manager::is_loggedinas()) {
// no access tracking
return;
}
if (isguestuser()) {
// Do not update guest access times/ips for performance.
return;
}
if (empty($courseid)) {
$courseid = SITEID;
}
$timenow = time();
/// Store site lastaccess time for the current user
if ($timenow - $USER->lastaccess > LASTACCESS_UPDATE_SECS) {
/// Update $USER->lastaccess for next checks
$USER->lastaccess = $timenow;
$last = new stdClass();
$last->id = $USER->id;
$last->lastip = getremoteaddr();
$last->lastaccess = $timenow;
$DB->update_record_raw('user', $last);
}
if ($courseid == SITEID) {
/// no user_lastaccess for frontpage
return;
}
/// Store course lastaccess times for the current user
if (empty($USER->currentcourseaccess[$courseid]) or ($timenow - $USER->currentcourseaccess[$courseid] > LASTACCESS_UPDATE_SECS)) {
$lastaccess = $DB->get_field('user_lastaccess', 'timeaccess', array('userid'=>$USER->id, 'courseid'=>$courseid));
if ($lastaccess === false) {
// Update course lastaccess for next checks
$USER->currentcourseaccess[$courseid] = $timenow;
$last = new stdClass();
$last->userid = $USER->id;
$last->courseid = $courseid;
$last->timeaccess = $timenow;
try {
$DB->insert_record_raw('user_lastaccess', $last, false);
} catch (dml_write_exception $e) {
// During a race condition we can fail to find the data, then it appears.
// If we still can't find it, rethrow the exception.
$lastaccess = $DB->get_field('user_lastaccess', 'timeaccess', array('userid' => $USER->id,
'courseid' => $courseid));
if ($lastaccess === false) {
throw $e;
}
// If we did find it, the race condition was true and another thread has inserted the time for us.
// We can just continue without having to do anything.
}
} else if ($timenow - $lastaccess < LASTACCESS_UPDATE_SECS) {
// no need to update now, it was updated recently in concurrent login ;-)
} else {
// Update course lastaccess for next checks
$USER->currentcourseaccess[$courseid] = $timenow;
$DB->set_field('user_lastaccess', 'timeaccess', $timenow, array('userid'=>$USER->id, 'courseid'=>$courseid));
}
}
}
/// GENERAL HELPFUL THINGS ///////////////////////////////////
/**
* Dumps a given object's information for debugging purposes
*
* When used in a CLI script, the object's information is written to the standard
* error output stream. When used in a web script, the object is dumped to a
* pre-formatted block with the "notifytiny" CSS class.
*
* @param mixed $object The data to be printed
* @return void output is echo'd
*/
function print_object($object) {
// we may need a lot of memory here
raise_memory_limit(MEMORY_EXTRA);
if (CLI_SCRIPT) {
fwrite(STDERR, print_r($object, true));
fwrite(STDERR, PHP_EOL);
} else {
echo html_writer::tag('pre', s(print_r($object, true)), array('class' => 'notifytiny'));
}
}
/**
* 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 ;-)
*
* @uses DEBUG_DEVELOPER
* @param string $message string contains the error message
* @param object $object object XMLDB object that fired the debug
*/
function xmldb_debug($message, $object) {
debugging($message, DEBUG_DEVELOPER);
}
/**
* @global object
* @uses CONTEXT_COURSECAT
* @return boolean Whether the user can create courses in any category in the system.
*/
function user_can_create_courses() {
global $DB;
$catsrs = $DB->get_recordset('course_categories');
foreach ($catsrs as $cat) {
if (has_capability('moodle/course:create', context_coursecat::instance($cat->id))) {
$catsrs->close();
return true;
}
}
$catsrs->close();
return false;
}
/**
* This method can update the values in mulitple database rows for a colum with
* a unique index, without violating that constraint.
*
* Suppose we have a table with a unique index on (otherid, sortorder), and
* for a particular value of otherid, we want to change all the sort orders.
* You have to do this carefully or you will violate the unique index at some time.
* This method takes care of the details for you.
*
* Note that, it is the responsibility of the caller to make sure that the
* requested rename is legal. For example, if you ask for [1 => 2, 2 => 2]
* then you will get a unique key violation error from the database.
*
* @param string $table The database table to modify.
* @param string $field the field that contains the values we are going to change.
* @param array $newvalues oldvalue => newvalue how to change the values.
* E.g. [1 => 4, 2 => 1, 3 => 3, 4 => 2].
* @param array $otherconditions array fieldname => requestedvalue extra WHERE clause
* conditions to restrict which rows are affected. E.g. array('otherid' => 123).
* @param int $unusedvalue (defaults to -1) a value that is never used in $ordercol.
*/
function update_field_with_unique_index($table, $field, array $newvalues,
array $otherconditions, $unusedvalue = -1) {
global $DB;
$safechanges = decompose_update_into_safe_changes($newvalues, $unusedvalue);
$transaction = $DB->start_delegated_transaction();
foreach ($safechanges as $change) {
list($from, $to) = $change;
$otherconditions[$field] = $from;
$DB->set_field($table, $field, $to, $otherconditions);
}
$transaction->allow_commit();
}
/**
* Helper used by {@link update_field_with_unique_index()}. Given a desired
* set of changes, break them down into single udpates that can be done one at
* a time without breaking any unique index constraints.
*
* Suppose the input is array(1 => 2, 2 => 1) and -1. Then the output will be
* array (array(1, -1), array(2, 1), array(-1, 2)). This function solves this
* problem in the general case, not just for simple swaps. The unit tests give
* more examples.
*
* Note that, it is the responsibility of the caller to make sure that the
* requested rename is legal. For example, if you ask for something impossible
* like array(1 => 2, 2 => 2) then the results are undefined. (You will probably
* get a unique key violation error from the database later.)
*
* @param array $newvalues The desired re-ordering.
* E.g. array(1 => 4, 2 => 1, 3 => 3, 4 => 2).
* @param int $unusedvalue A value that is not currently used.
* @return array A safe way to perform the re-order. An array of two-element
* arrays array($from, $to).
* E.g. array(array(1, -1), array(2, 1), array(4, 2), array(-1, 4)).
*/
function decompose_update_into_safe_changes(array $newvalues, $unusedvalue) {
$nontrivialmap = array();
foreach ($newvalues as $from => $to) {
if ($from == $unusedvalue || $to == $unusedvalue) {
throw new \coding_exception('Supposedly unused value ' . $unusedvalue . ' is actually used!');
}
if ($from != $to) {
$nontrivialmap[$from] = $to;
}
}
if (empty($nontrivialmap)) {
return array();
}
// First we deal with all renames that are not part of cycles.
// This bit is O(n^2) and it ought to be possible to do better,
// but it does not seem worth the effort.
$safechanges = array();
$nontrivialmapchanged = true;
while ($nontrivialmapchanged) {
$nontrivialmapchanged = false;
foreach ($nontrivialmap as $from => $to) {
if (array_key_exists($to, $nontrivialmap)) {
continue; // Cannot currenly do this rename.
}
// Is safe to do this rename now.
$safechanges[] = array($from, $to);
unset($nontrivialmap[$from]);
$nontrivialmapchanged = true;
}
}
// Are we done?
if (empty($nontrivialmap)) {
return $safechanges;
}
// Now what is left in $nontrivialmap must be a permutation,
// which must be a combination of disjoint cycles. We need to break them.
while (!empty($nontrivialmap)) {
// Extract the first cycle.
reset($nontrivialmap);
$current = $cyclestart = key($nontrivialmap);
$cycle = array();
do {
$cycle[] = $current;
$next = $nontrivialmap[$current];
unset($nontrivialmap[$current]);
$current = $next;
} while ($current != $cyclestart);
// Now convert it to a sequence of safe renames by using a temp.
$safechanges[] = array($cyclestart, $unusedvalue);
$cycle[0] = $unusedvalue;
$to = $cyclestart;
while ($from = array_pop($cycle)) {
$safechanges[] = array($from, $to);
$to = $from;
}
}
return $safechanges;
}