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lib.php
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lib.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 useful functions
*
* @copyright 1999 Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @package core_course
*/
defined('MOODLE_INTERNAL') || die;
require_once($CFG->libdir.'/completionlib.php');
require_once($CFG->libdir.'/filelib.php');
require_once($CFG->libdir.'/datalib.php');
require_once($CFG->dirroot.'/course/format/lib.php');
define('COURSE_MAX_LOGS_PER_PAGE', 1000); // Records.
define('COURSE_MAX_RECENT_PERIOD', 172800); // Two days, in seconds.
/**
* Number of courses to display when summaries are included.
* @var int
* @deprecated since 2.4, use $CFG->courseswithsummarieslimit instead.
*/
define('COURSE_MAX_SUMMARIES_PER_PAGE', 10);
// Max courses in log dropdown before switching to optional.
define('COURSE_MAX_COURSES_PER_DROPDOWN', 1000);
// Max users in log dropdown before switching to optional.
define('COURSE_MAX_USERS_PER_DROPDOWN', 1000);
define('FRONTPAGENEWS', '0');
define('FRONTPAGECATEGORYNAMES', '2');
define('FRONTPAGECATEGORYCOMBO', '4');
define('FRONTPAGEENROLLEDCOURSELIST', '5');
define('FRONTPAGEALLCOURSELIST', '6');
define('FRONTPAGECOURSESEARCH', '7');
// Important! Replaced with $CFG->frontpagecourselimit - maximum number of courses displayed on the frontpage.
define('EXCELROWS', 65535);
define('FIRSTUSEDEXCELROW', 3);
define('MOD_CLASS_ACTIVITY', 0);
define('MOD_CLASS_RESOURCE', 1);
define('COURSE_TIMELINE_ALLINCLUDINGHIDDEN', 'allincludinghidden');
define('COURSE_TIMELINE_ALL', 'all');
define('COURSE_TIMELINE_PAST', 'past');
define('COURSE_TIMELINE_INPROGRESS', 'inprogress');
define('COURSE_TIMELINE_FUTURE', 'future');
define('COURSE_FAVOURITES', 'favourites');
define('COURSE_TIMELINE_HIDDEN', 'hidden');
define('COURSE_CUSTOMFIELD', 'customfield');
define('COURSE_DB_QUERY_LIMIT', 1000);
/** Searching for all courses that have no value for the specified custom field. */
define('COURSE_CUSTOMFIELD_EMPTY', -1);
// Course activity chooser footer default display option.
define('COURSE_CHOOSER_FOOTER_NONE', 'hidden');
// Download course content options.
define('DOWNLOAD_COURSE_CONTENT_DISABLED', 0);
define('DOWNLOAD_COURSE_CONTENT_ENABLED', 1);
define('DOWNLOAD_COURSE_CONTENT_SITE_DEFAULT', 2);
function make_log_url($module, $url) {
switch ($module) {
case 'course':
if (strpos($url, 'report/') === 0) {
// there is only one report type, course reports are deprecated
$url = "/$url";
break;
}
case 'file':
case 'login':
case 'lib':
case 'admin':
case 'category':
case 'mnet course':
if (strpos($url, '../') === 0) {
$url = ltrim($url, '.');
} else {
$url = "/course/$url";
}
break;
case 'calendar':
$url = "/calendar/$url";
break;
case 'user':
case 'blog':
$url = "/$module/$url";
break;
case 'upload':
$url = $url;
break;
case 'coursetags':
$url = '/'.$url;
break;
case 'library':
case '':
$url = '/';
break;
case 'message':
$url = "/message/$url";
break;
case 'notes':
$url = "/notes/$url";
break;
case 'tag':
$url = "/tag/$url";
break;
case 'role':
$url = '/'.$url;
break;
case 'grade':
$url = "/grade/$url";
break;
default:
$url = "/mod/$module/$url";
break;
}
//now let's sanitise urls - there might be some ugly nasties:-(
$parts = explode('?', $url);
$script = array_shift($parts);
if (strpos($script, 'http') === 0) {
$script = clean_param($script, PARAM_URL);
} else {
$script = clean_param($script, PARAM_PATH);
}
$query = '';
if ($parts) {
$query = implode('', $parts);
$query = str_replace('&', '&', $query); // both & and & are stored in db :-|
$parts = explode('&', $query);
$eq = urlencode('=');
foreach ($parts as $key=>$part) {
$part = urlencode(urldecode($part));
$part = str_replace($eq, '=', $part);
$parts[$key] = $part;
}
$query = '?'.implode('&', $parts);
}
return $script.$query;
}
function build_mnet_logs_array($hostid, $course, $user=0, $date=0, $order="l.time ASC", $limitfrom='', $limitnum='',
$modname="", $modid=0, $modaction="", $groupid=0) {
global $CFG, $DB;
// It is assumed that $date is the GMT time of midnight for that day,
// and so the next 86400 seconds worth of logs are printed.
/// Setup for group handling.
// TODO: I don't understand group/context/etc. enough to be able to do
// something interesting with it here
// What is the context of a remote course?
/// If the group mode is separate, and this user does not have editing privileges,
/// then only the user's group can be viewed.
//if ($course->groupmode == SEPARATEGROUPS and !has_capability('moodle/course:managegroups', context_course::instance($course->id))) {
// $groupid = get_current_group($course->id);
//}
/// If this course doesn't have groups, no groupid can be specified.
//else if (!$course->groupmode) {
// $groupid = 0;
//}
$groupid = 0;
$joins = array();
$where = '';
$qry = "SELECT l.*, u.firstname, u.lastname, u.picture
FROM {mnet_log} l
LEFT JOIN {user} u ON l.userid = u.id
WHERE ";
$params = array();
$where .= "l.hostid = :hostid";
$params['hostid'] = $hostid;
// TODO: Is 1 really a magic number referring to the sitename?
if ($course != SITEID || $modid != 0) {
$where .= " AND l.course=:courseid";
$params['courseid'] = $course;
}
if ($modname) {
$where .= " AND l.module = :modname";
$params['modname'] = $modname;
}
if ('site_errors' === $modid) {
$where .= " AND ( l.action='error' OR l.action='infected' )";
} else if ($modid) {
//TODO: This assumes that modids are the same across sites... probably
//not true
$where .= " AND l.cmid = :modid";
$params['modid'] = $modid;
}
if ($modaction) {
$firstletter = substr($modaction, 0, 1);
if ($firstletter == '-') {
$where .= " AND ".$DB->sql_like('l.action', ':modaction', false, true, true);
$params['modaction'] = '%'.substr($modaction, 1).'%';
} else {
$where .= " AND ".$DB->sql_like('l.action', ':modaction', false);
$params['modaction'] = '%'.$modaction.'%';
}
}
if ($user) {
$where .= " AND l.userid = :user";
$params['user'] = $user;
}
if ($date) {
$enddate = $date + 86400;
$where .= " AND l.time > :date AND l.time < :enddate";
$params['date'] = $date;
$params['enddate'] = $enddate;
}
$result = array();
$result['totalcount'] = $DB->count_records_sql("SELECT COUNT('x') FROM {mnet_log} l WHERE $where", $params);
if(!empty($result['totalcount'])) {
$where .= " ORDER BY $order";
$result['logs'] = $DB->get_records_sql("$qry $where", $params, $limitfrom, $limitnum);
} else {
$result['logs'] = array();
}
return $result;
}
/**
* Checks the integrity of the course data.
*
* In summary - compares course_sections.sequence and course_modules.section.
*
* More detailed, checks that:
* - course_sections.sequence contains each module id not more than once in the course
* - for each moduleid from course_sections.sequence the field course_modules.section
* refers to the same section id (this means course_sections.sequence is more
* important if they are different)
* - ($fullcheck only) each module in the course is present in one of
* course_sections.sequence
* - ($fullcheck only) removes non-existing course modules from section sequences
*
* If there are any mismatches, the changes are made and records are updated in DB.
*
* Course cache is NOT rebuilt if there are any errors!
*
* This function is used each time when course cache is being rebuilt with $fullcheck = false
* and in CLI script admin/cli/fix_course_sequence.php with $fullcheck = true
*
* @param int $courseid id of the course
* @param array $rawmods result of funciton {@link get_course_mods()} - containst
* the list of enabled course modules in the course. Retrieved from DB if not specified.
* Argument ignored in cashe of $fullcheck, the list is retrieved form DB anyway.
* @param array $sections records from course_sections table for this course.
* Retrieved from DB if not specified
* @param bool $fullcheck Will add orphaned modules to their sections and remove non-existing
* course modules from sequences. Only to be used in site maintenance mode when we are
* sure that another user is not in the middle of the process of moving/removing a module.
* @param bool $checkonly Only performs the check without updating DB, outputs all errors as debug messages.
* @return array array of messages with found problems. Empty output means everything is ok
*/
function course_integrity_check($courseid, $rawmods = null, $sections = null, $fullcheck = false, $checkonly = false) {
global $DB;
$messages = array();
if ($sections === null) {
$sections = $DB->get_records('course_sections', array('course' => $courseid), 'section', 'id,section,sequence');
}
if ($fullcheck) {
// Retrieve all records from course_modules regardless of module type visibility.
$rawmods = $DB->get_records('course_modules', array('course' => $courseid), 'id', 'id,section');
}
if ($rawmods === null) {
$rawmods = get_course_mods($courseid);
}
if (!$fullcheck && (empty($sections) || empty($rawmods))) {
// If either of the arrays is empty, no modules are displayed anyway.
return true;
}
$debuggingprefix = 'Failed integrity check for course ['.$courseid.']. ';
// First make sure that each module id appears in section sequences only once.
// If it appears in several section sequences the last section wins.
// If it appears twice in one section sequence, the first occurence wins.
$modsection = array();
foreach ($sections as $sectionid => $section) {
$sections[$sectionid]->newsequence = $section->sequence;
if (!empty($section->sequence)) {
$sequence = explode(",", $section->sequence);
$sequenceunique = array_unique($sequence);
if (count($sequenceunique) != count($sequence)) {
// Some course module id appears in this section sequence more than once.
ksort($sequenceunique); // Preserve initial order of modules.
$sequence = array_values($sequenceunique);
$sections[$sectionid]->newsequence = join(',', $sequence);
$messages[] = $debuggingprefix.'Sequence for course section ['.
$sectionid.'] is "'.$sections[$sectionid]->sequence.'", must be "'.$sections[$sectionid]->newsequence.'"';
}
foreach ($sequence as $cmid) {
if (array_key_exists($cmid, $modsection) && isset($rawmods[$cmid])) {
// Some course module id appears to be in more than one section's sequences.
$wrongsectionid = $modsection[$cmid];
$sections[$wrongsectionid]->newsequence = trim(preg_replace("/,$cmid,/", ',', ','.$sections[$wrongsectionid]->newsequence. ','), ',');
$messages[] = $debuggingprefix.'Course module ['.$cmid.'] must be removed from sequence of section ['.
$wrongsectionid.'] because it is also present in sequence of section ['.$sectionid.']';
}
$modsection[$cmid] = $sectionid;
}
}
}
// Add orphaned modules to their sections if they exist or to section 0 otherwise.
if ($fullcheck) {
foreach ($rawmods as $cmid => $mod) {
if (!isset($modsection[$cmid])) {
// This is a module that is not mentioned in course_section.sequence at all.
// Add it to the section $mod->section or to the last available section.
if ($mod->section && isset($sections[$mod->section])) {
$modsection[$cmid] = $mod->section;
} else {
$firstsection = reset($sections);
$modsection[$cmid] = $firstsection->id;
}
$sections[$modsection[$cmid]]->newsequence = trim($sections[$modsection[$cmid]]->newsequence.','.$cmid, ',');
$messages[] = $debuggingprefix.'Course module ['.$cmid.'] is missing from sequence of section ['.
$modsection[$cmid].']';
}
}
foreach ($modsection as $cmid => $sectionid) {
if (!isset($rawmods[$cmid])) {
// Section $sectionid refers to module id that does not exist.
$sections[$sectionid]->newsequence = trim(preg_replace("/,$cmid,/", ',', ','.$sections[$sectionid]->newsequence.','), ',');
$messages[] = $debuggingprefix.'Course module ['.$cmid.
'] does not exist but is present in the sequence of section ['.$sectionid.']';
}
}
}
// Update changed sections.
if (!$checkonly && !empty($messages)) {
foreach ($sections as $sectionid => $section) {
if ($section->newsequence !== $section->sequence) {
$DB->update_record('course_sections', array('id' => $sectionid, 'sequence' => $section->newsequence));
}
}
}
// Now make sure that all modules point to the correct sections.
foreach ($rawmods as $cmid => $mod) {
if (isset($modsection[$cmid]) && $modsection[$cmid] != $mod->section) {
if (!$checkonly) {
$DB->update_record('course_modules', array('id' => $cmid, 'section' => $modsection[$cmid]));
}
$messages[] = $debuggingprefix.'Course module ['.$cmid.
'] points to section ['.$mod->section.'] instead of ['.$modsection[$cmid].']';
}
}
return $messages;
}
/**
* For a given course, returns an array of course activity objects
* Each item in the array contains he following properties:
*/
function get_array_of_activities($courseid) {
// cm - course module id
// mod - name of the module (eg forum)
// section - the number of the section (eg week or topic)
// name - the name of the instance
// visible - is the instance visible or not
// groupingid - grouping id
// extra - contains extra string to include in any link
global $CFG, $DB;
$course = $DB->get_record('course', array('id'=>$courseid));
if (empty($course)) {
throw new moodle_exception('courseidnotfound');
}
$mod = array();
$rawmods = get_course_mods($courseid);
if (empty($rawmods)) {
return $mod; // always return array
}
$courseformat = course_get_format($course);
if ($sections = $DB->get_records('course_sections', array('course' => $courseid),
'section ASC', 'id,section,sequence,visible')) {
// First check and correct obvious mismatches between course_sections.sequence and course_modules.section.
if ($errormessages = course_integrity_check($courseid, $rawmods, $sections)) {
debugging(join('<br>', $errormessages));
$rawmods = get_course_mods($courseid);
$sections = $DB->get_records('course_sections', array('course' => $courseid),
'section ASC', 'id,section,sequence,visible');
}
// Build array of activities.
foreach ($sections as $section) {
if (!empty($section->sequence)) {
$sequence = explode(",", $section->sequence);
foreach ($sequence as $seq) {
if (empty($rawmods[$seq])) {
continue;
}
// Adjust visibleoncoursepage, value in DB may not respect format availability.
$rawmods[$seq]->visibleoncoursepage = (!$rawmods[$seq]->visible
|| $rawmods[$seq]->visibleoncoursepage
|| empty($CFG->allowstealth)
|| !$courseformat->allow_stealth_module_visibility($rawmods[$seq], $section)) ? 1 : 0;
// Create an object that will be cached.
$mod[$seq] = new stdClass();
$mod[$seq]->id = $rawmods[$seq]->instance;
$mod[$seq]->cm = $rawmods[$seq]->id;
$mod[$seq]->mod = $rawmods[$seq]->modname;
// Oh dear. Inconsistent names left here for backward compatibility.
$mod[$seq]->section = $section->section;
$mod[$seq]->sectionid = $rawmods[$seq]->section;
$mod[$seq]->module = $rawmods[$seq]->module;
$mod[$seq]->added = $rawmods[$seq]->added;
$mod[$seq]->score = $rawmods[$seq]->score;
$mod[$seq]->idnumber = $rawmods[$seq]->idnumber;
$mod[$seq]->visible = $rawmods[$seq]->visible;
$mod[$seq]->visibleoncoursepage = $rawmods[$seq]->visibleoncoursepage;
$mod[$seq]->visibleold = $rawmods[$seq]->visibleold;
$mod[$seq]->groupmode = $rawmods[$seq]->groupmode;
$mod[$seq]->groupingid = $rawmods[$seq]->groupingid;
$mod[$seq]->indent = $rawmods[$seq]->indent;
$mod[$seq]->completion = $rawmods[$seq]->completion;
$mod[$seq]->extra = "";
$mod[$seq]->completiongradeitemnumber =
$rawmods[$seq]->completiongradeitemnumber;
$mod[$seq]->completionview = $rawmods[$seq]->completionview;
$mod[$seq]->completionexpected = $rawmods[$seq]->completionexpected;
$mod[$seq]->showdescription = $rawmods[$seq]->showdescription;
$mod[$seq]->availability = $rawmods[$seq]->availability;
$mod[$seq]->deletioninprogress = $rawmods[$seq]->deletioninprogress;
$modname = $mod[$seq]->mod;
$functionname = $modname."_get_coursemodule_info";
if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
continue;
}
include_once("$CFG->dirroot/mod/$modname/lib.php");
if ($hasfunction = function_exists($functionname)) {
if ($info = $functionname($rawmods[$seq])) {
if (!empty($info->icon)) {
$mod[$seq]->icon = $info->icon;
}
if (!empty($info->iconcomponent)) {
$mod[$seq]->iconcomponent = $info->iconcomponent;
}
if (!empty($info->name)) {
$mod[$seq]->name = $info->name;
}
if ($info instanceof cached_cm_info) {
// When using cached_cm_info you can include three new fields
// that aren't available for legacy code
if (!empty($info->content)) {
$mod[$seq]->content = $info->content;
}
if (!empty($info->extraclasses)) {
$mod[$seq]->extraclasses = $info->extraclasses;
}
if (!empty($info->iconurl)) {
// Convert URL to string as it's easier to store. Also serialized object contains \0 byte and can not be written to Postgres DB.
$url = new moodle_url($info->iconurl);
$mod[$seq]->iconurl = $url->out(false);
}
if (!empty($info->onclick)) {
$mod[$seq]->onclick = $info->onclick;
}
if (!empty($info->customdata)) {
$mod[$seq]->customdata = $info->customdata;
}
} else {
// When using a stdclass, the (horrible) deprecated ->extra field
// is available for BC
if (!empty($info->extra)) {
$mod[$seq]->extra = $info->extra;
}
}
}
}
// When there is no modname_get_coursemodule_info function,
// but showdescriptions is enabled, then we use the 'intro'
// and 'introformat' fields in the module table
if (!$hasfunction && $rawmods[$seq]->showdescription) {
if ($modvalues = $DB->get_record($rawmods[$seq]->modname,
array('id' => $rawmods[$seq]->instance), 'name, intro, introformat')) {
// Set content from intro and introformat. Filters are disabled
// because we filter it with format_text at display time
$mod[$seq]->content = format_module_intro($rawmods[$seq]->modname,
$modvalues, $rawmods[$seq]->id, false);
// To save making another query just below, put name in here
$mod[$seq]->name = $modvalues->name;
}
}
if (!isset($mod[$seq]->name)) {
$mod[$seq]->name = $DB->get_field($rawmods[$seq]->modname, "name", array("id"=>$rawmods[$seq]->instance));
}
// Minimise the database size by unsetting default options when they are
// 'empty'. This list corresponds to code in the cm_info constructor.
foreach (array('idnumber', 'groupmode', 'groupingid',
'indent', 'completion', 'extra', 'extraclasses', 'iconurl', 'onclick', 'content',
'icon', 'iconcomponent', 'customdata', 'availability', 'completionview',
'completionexpected', 'score', 'showdescription', 'deletioninprogress') as $property) {
if (property_exists($mod[$seq], $property) &&
empty($mod[$seq]->{$property})) {
unset($mod[$seq]->{$property});
}
}
// Special case: this value is usually set to null, but may be 0
if (property_exists($mod[$seq], 'completiongradeitemnumber') &&
is_null($mod[$seq]->completiongradeitemnumber)) {
unset($mod[$seq]->completiongradeitemnumber);
}
}
}
}
}
return $mod;
}
/**
* Returns the localised human-readable names of all used modules
*
* @param bool $plural if true returns the plural forms of the names
* @return array where key is the module name (component name without 'mod_') and
* the value is the human-readable string. Array sorted alphabetically by value
*/
function get_module_types_names($plural = false) {
static $modnames = null;
global $DB, $CFG;
if ($modnames === null) {
$modnames = array(0 => array(), 1 => array());
if ($allmods = $DB->get_records("modules")) {
foreach ($allmods as $mod) {
if (file_exists("$CFG->dirroot/mod/$mod->name/lib.php") && $mod->visible) {
$modnames[0][$mod->name] = get_string("modulename", "$mod->name", null, true);
$modnames[1][$mod->name] = get_string("modulenameplural", "$mod->name", null, true);
}
}
}
}
return $modnames[(int)$plural];
}
/**
* Set highlighted section. Only one section can be highlighted at the time.
*
* @param int $courseid course id
* @param int $marker highlight section with this number, 0 means remove higlightin
* @return void
*/
function course_set_marker($courseid, $marker) {
global $DB, $COURSE;
$DB->set_field("course", "marker", $marker, array('id' => $courseid));
if ($COURSE && $COURSE->id == $courseid) {
$COURSE->marker = $marker;
}
if (class_exists('format_base')) {
format_base::reset_course_cache($courseid);
}
course_modinfo::clear_instance_cache($courseid);
}
/**
* For a given course section, marks it visible or hidden,
* and does the same for every activity in that section
*
* @param int $courseid course id
* @param int $sectionnumber The section number to adjust
* @param int $visibility The new visibility
* @return array A list of resources which were hidden in the section
*/
function set_section_visible($courseid, $sectionnumber, $visibility) {
global $DB;
$resourcestotoggle = array();
if ($section = $DB->get_record("course_sections", array("course"=>$courseid, "section"=>$sectionnumber))) {
course_update_section($courseid, $section, array('visible' => $visibility));
// Determine which modules are visible for AJAX update
$modules = !empty($section->sequence) ? explode(',', $section->sequence) : array();
if (!empty($modules)) {
list($insql, $params) = $DB->get_in_or_equal($modules);
$select = 'id ' . $insql . ' AND visible = ?';
array_push($params, $visibility);
if (!$visibility) {
$select .= ' AND visibleold = 1';
}
$resourcestotoggle = $DB->get_fieldset_select('course_modules', 'id', $select, $params);
}
}
return $resourcestotoggle;
}
/**
* Return the course category context for the category with id $categoryid, except
* that if $categoryid is 0, return the system context.
*
* @param integer $categoryid a category id or 0.
* @return context the corresponding context
*/
function get_category_or_system_context($categoryid) {
if ($categoryid) {
return context_coursecat::instance($categoryid, IGNORE_MISSING);
} else {
return context_system::instance();
}
}
/**
* Print the buttons relating to course requests.
*
* @param context $context current page context.
*/
function print_course_request_buttons($context) {
global $CFG, $DB, $OUTPUT;
if (empty($CFG->enablecourserequests)) {
return;
}
if (course_request::can_request($context)) {
// Print a button to request a new course.
$params = [];
if ($context instanceof context_coursecat) {
$params['category'] = $context->instanceid;
}
echo $OUTPUT->single_button(new moodle_url('/course/request.php', $params),
get_string('requestcourse'), 'get');
}
/// Print a button to manage pending requests
if (has_capability('moodle/site:approvecourse', $context)) {
$disabled = !$DB->record_exists('course_request', array());
echo $OUTPUT->single_button(new moodle_url('/course/pending.php'), get_string('coursespending'), 'get', array('disabled' => $disabled));
}
}
/**
* Does the user have permission to edit things in this category?
*
* @param integer $categoryid The id of the category we are showing, or 0 for system context.
* @return boolean has_any_capability(array(...), ...); in the appropriate context.
*/
function can_edit_in_category($categoryid = 0) {
$context = get_category_or_system_context($categoryid);
return has_any_capability(array('moodle/category:manage', 'moodle/course:create'), $context);
}
/// MODULE FUNCTIONS /////////////////////////////////////////////////////////////////
function add_course_module($mod) {
global $DB;
$mod->added = time();
unset($mod->id);
$cmid = $DB->insert_record("course_modules", $mod);
rebuild_course_cache($mod->course, true);
return $cmid;
}
/**
* Creates a course section and adds it to the specified position
*
* @param int|stdClass $courseorid course id or course object
* @param int $position position to add to, 0 means to the end. If position is greater than
* number of existing secitons, the section is added to the end. This will become sectionnum of the
* new section. All existing sections at this or bigger position will be shifted down.
* @param bool $skipcheck the check has already been made and we know that the section with this position does not exist
* @return stdClass created section object
*/
function course_create_section($courseorid, $position = 0, $skipcheck = false) {
global $DB;
$courseid = is_object($courseorid) ? $courseorid->id : $courseorid;
// Find the last sectionnum among existing sections.
if ($skipcheck) {
$lastsection = $position - 1;
} else {
$lastsection = (int)$DB->get_field_sql('SELECT max(section) from {course_sections} WHERE course = ?', [$courseid]);
}
// First add section to the end.
$cw = new stdClass();
$cw->course = $courseid;
$cw->section = $lastsection + 1;
$cw->summary = '';
$cw->summaryformat = FORMAT_HTML;
$cw->sequence = '';
$cw->name = null;
$cw->visible = 1;
$cw->availability = null;
$cw->timemodified = time();
$cw->id = $DB->insert_record("course_sections", $cw);
// Now move it to the specified position.
if ($position > 0 && $position <= $lastsection) {
$course = is_object($courseorid) ? $courseorid : get_course($courseorid);
move_section_to($course, $cw->section, $position, true);
$cw->section = $position;
}
core\event\course_section_created::create_from_section($cw)->trigger();
rebuild_course_cache($courseid, true);
return $cw;
}
/**
* Creates missing course section(s) and rebuilds course cache
*
* @param int|stdClass $courseorid course id or course object
* @param int|array $sections list of relative section numbers to create
* @return bool if there were any sections created
*/
function course_create_sections_if_missing($courseorid, $sections) {
if (!is_array($sections)) {
$sections = array($sections);
}
$existing = array_keys(get_fast_modinfo($courseorid)->get_section_info_all());
if ($newsections = array_diff($sections, $existing)) {
foreach ($newsections as $sectionnum) {
course_create_section($courseorid, $sectionnum, true);
}
return true;
}
return false;
}
/**
* Adds an existing module to the section
*
* Updates both tables {course_sections} and {course_modules}
*
* Note: This function does not use modinfo PROVIDED that the section you are
* adding the module to already exists. If the section does not exist, it will
* build modinfo if necessary and create the section.
*
* @param int|stdClass $courseorid course id or course object
* @param int $cmid id of the module already existing in course_modules table
* @param int $sectionnum relative number of the section (field course_sections.section)
* If section does not exist it will be created
* @param int|stdClass $beforemod id or object with field id corresponding to the module
* before which the module needs to be included. Null for inserting in the
* end of the section
* @return int The course_sections ID where the module is inserted
*/
function course_add_cm_to_section($courseorid, $cmid, $sectionnum, $beforemod = null) {
global $DB, $COURSE;
if (is_object($beforemod)) {
$beforemod = $beforemod->id;
}
if (is_object($courseorid)) {
$courseid = $courseorid->id;
} else {
$courseid = $courseorid;
}
// Do not try to use modinfo here, there is no guarantee it is valid!
$section = $DB->get_record('course_sections',
array('course' => $courseid, 'section' => $sectionnum), '*', IGNORE_MISSING);
if (!$section) {
// This function call requires modinfo.
course_create_sections_if_missing($courseorid, $sectionnum);
$section = $DB->get_record('course_sections',
array('course' => $courseid, 'section' => $sectionnum), '*', MUST_EXIST);
}
$modarray = explode(",", trim($section->sequence));
if (empty($section->sequence)) {
$newsequence = "$cmid";
} else if ($beforemod && ($key = array_keys($modarray, $beforemod))) {
$insertarray = array($cmid, $beforemod);
array_splice($modarray, $key[0], 1, $insertarray);
$newsequence = implode(",", $modarray);
} else {
$newsequence = "$section->sequence,$cmid";
}
$DB->set_field("course_sections", "sequence", $newsequence, array("id" => $section->id));
$DB->set_field('course_modules', 'section', $section->id, array('id' => $cmid));
if (is_object($courseorid)) {
rebuild_course_cache($courseorid->id, true);
} else {
rebuild_course_cache($courseorid, true);
}
return $section->id; // Return course_sections ID that was used.
}
/**
* Change the group mode of a course module.
*
* Note: Do not forget to trigger the event \core\event\course_module_updated as it needs
* to be triggered manually, refer to {@link \core\event\course_module_updated::create_from_cm()}.
*
* @param int $id course module ID.
* @param int $groupmode the new groupmode value.
* @return bool True if the $groupmode was updated.
*/
function set_coursemodule_groupmode($id, $groupmode) {
global $DB;
$cm = $DB->get_record('course_modules', array('id' => $id), 'id,course,groupmode', MUST_EXIST);
if ($cm->groupmode != $groupmode) {
$DB->set_field('course_modules', 'groupmode', $groupmode, array('id' => $cm->id));
rebuild_course_cache($cm->course, true);
}
return ($cm->groupmode != $groupmode);
}
function set_coursemodule_idnumber($id, $idnumber) {
global $DB;
$cm = $DB->get_record('course_modules', array('id' => $id), 'id,course,idnumber', MUST_EXIST);
if ($cm->idnumber != $idnumber) {
$DB->set_field('course_modules', 'idnumber', $idnumber, array('id' => $cm->id));
rebuild_course_cache($cm->course, true);
}
return ($cm->idnumber != $idnumber);
}
/**
* Set the visibility of a module and inherent properties.
*
* Note: Do not forget to trigger the event \core\event\course_module_updated as it needs
* to be triggered manually, refer to {@link \core\event\course_module_updated::create_from_cm()}.
*
* From 2.4 the parameter $prevstateoverrides has been removed, the logic it triggered
* has been moved to {@link set_section_visible()} which was the only place from which
* the parameter was used.
*
* @param int $id of the module
* @param int $visible state of the module
* @param int $visibleoncoursepage state of the module on the course page
* @return bool false when the module was not found, true otherwise
*/
function set_coursemodule_visible($id, $visible, $visibleoncoursepage = 1) {
global $DB, $CFG;
require_once($CFG->libdir.'/gradelib.php');
require_once($CFG->dirroot.'/calendar/lib.php');
if (!$cm = $DB->get_record('course_modules', array('id'=>$id))) {
return false;
}
// Create events and propagate visibility to associated grade items if the value has changed.
// Only do this if it's changed to avoid accidently overwriting manual showing/hiding of student grades.
if ($cm->visible == $visible && $cm->visibleoncoursepage == $visibleoncoursepage) {
return true;
}
if (!$modulename = $DB->get_field('modules', 'name', array('id'=>$cm->module))) {
return false;
}
if (($cm->visible != $visible) &&
($events = $DB->get_records('event', array('instance' => $cm->instance, 'modulename' => $modulename)))) {
foreach($events as $event) {
if ($visible) {
$event = new calendar_event($event);
$event->toggle_visibility(true);
} else {
$event = new calendar_event($event);
$event->toggle_visibility(false);
}
}
}
// Updating visible and visibleold to keep them in sync. Only changing a section visibility will
// affect visibleold to allow for an original visibility restore. See set_section_visible().
$cminfo = new stdClass();
$cminfo->id = $id;
$cminfo->visible = $visible;
$cminfo->visibleoncoursepage = $visibleoncoursepage;
$cminfo->visibleold = $visible;
$DB->update_record('course_modules', $cminfo);
// Hide the associated grade items so the teacher doesn't also have to go to the gradebook and hide them there.
// Note that this must be done after updating the row in course_modules, in case
// the modules grade_item_update function needs to access $cm->visible.
if ($cm->visible != $visible &&
plugin_supports('mod', $modulename, FEATURE_CONTROLS_GRADE_VISIBILITY) &&
component_callback_exists('mod_' . $modulename, 'grade_item_update')) {
$instance = $DB->get_record($modulename, array('id' => $cm->instance), '*', MUST_EXIST);
component_callback('mod_' . $modulename, 'grade_item_update', array($instance));
} else if ($cm->visible != $visible) {
$grade_items = grade_item::fetch_all(array('itemtype'=>'mod', 'itemmodule'=>$modulename, 'iteminstance'=>$cm->instance, 'courseid'=>$cm->course));
if ($grade_items) {
foreach ($grade_items as $grade_item) {
$grade_item->set_hidden(!$visible);
}
}
}
rebuild_course_cache($cm->course, true);
return true;
}
/**
* Changes the course module name
*
* @param int $id course module id
* @param string $name new value for a name
* @return bool whether a change was made
*/
function set_coursemodule_name($id, $name) {
global $CFG, $DB;
require_once($CFG->libdir . '/gradelib.php');
$cm = get_coursemodule_from_id('', $id, 0, false, MUST_EXIST);
$module = new \stdClass();
$module->id = $cm->instance;
// Escape strings as they would be by mform.
if (!empty($CFG->formatstringstriptags)) {
$module->name = clean_param($name, PARAM_TEXT);
} else {
$module->name = clean_param($name, PARAM_CLEANHTML);
}
if ($module->name === $cm->name || strval($module->name) === '') {
return false;
}
if (\core_text::strlen($module->name) > 255) {
throw new \moodle_exception('maximumchars', 'moodle', '', 255);
}
$module->timemodified = time();
$DB->update_record($cm->modname, $module);
$cm->name = $module->name;
\core\event\course_module_updated::create_from_cm($cm)->trigger();
rebuild_course_cache($cm->course, true);
// Attempt to update the grade item if relevant.
$grademodule = $DB->get_record($cm->modname, array('id' => $cm->instance));
$grademodule->cmidnumber = $cm->idnumber;
$grademodule->modname = $cm->modname;
grade_update_mod_grades($grademodule);
// Update calendar events with the new name.
course_module_update_calendar_events($cm->modname, $grademodule, $cm);
return true;
}
/**
* This function will handle the whole deletion process of a module. This includes calling
* the modules delete_instance function, deleting files, events, grades, conditional data,
* the data in the course_module and course_sections table and adding a module deletion
* event to the DB.
*
* @param int $cmid the course module id
* @param bool $async whether or not to try to delete the module using an adhoc task. Async also depends on a plugin hook.
* @throws moodle_exception
* @since Moodle 2.5
*/
function course_delete_module($cmid, $async = false) {
// Check the 'course_module_background_deletion_recommended' hook first.
// Only use asynchronous deletion if at least one plugin returns true and if async deletion has been requested.
// Both are checked because plugins should not be allowed to dictate the deletion behaviour, only support/decline it.
// It's up to plugins to handle things like whether or not they are enabled.
if ($async && $pluginsfunction = get_plugins_with_function('course_module_background_deletion_recommended')) {
foreach ($pluginsfunction as $plugintype => $plugins) {
foreach ($plugins as $pluginfunction) {
if ($pluginfunction()) {
return course_module_flag_for_async_deletion($cmid);
}
}
}
}