/lib/deprecatedlib.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/>.

/**
 * deprecatedlib.php - Old functions retained only for backward compatibility
 *
 * Old functions retained only for backward compatibility.  New code should not
 * use any of these functions.
 *
 * @package    core
 * @subpackage deprecated
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @deprecated
 */

defined('MOODLE_INTERNAL') || die();

/* === Functions that needs to be kept longer in deprecated lib than normal time period === */

/**
 * Add an entry to the legacy log table.
 *
 * @deprecated since 2.7 use new events instead
 *
 * @param    int     $courseid  The course id
 * @param    string  $module  The module name  e.g. forum, journal, resource, course, user etc
 * @param    string  $action  'view', 'update', 'add' or 'delete', possibly followed by another word to clarify.
 * @param    string  $url     The file and parameters used to see the results of the action
 * @param    string  $info    Additional description information
 * @param    int     $cm      The course_module->id if there is one
 * @param    int|stdClass $user If log regards $user other than $USER
 * @return void
 */
function add_to_log($courseid, $module, $action, $url='', $info='', $cm=0, $user=0) {
    debugging('add_to_log() has been deprecated, please rewrite your code to the new events API', DEBUG_DEVELOPER);

    // This is a nasty hack that allows us to put all the legacy stuff into legacy storage,
    // this way we may move all the legacy settings there too.
    $manager = get_log_manager();
    if (method_exists($manager, 'legacy_add_to_log')) {
        $manager->legacy_add_to_log($courseid, $module, $action, $url, $info, $cm, $user);
    }
}

/**
 * @deprecated since 2.6
 */
function events_trigger() {
    throw new coding_exception('events_trigger() has been deprecated along with all Events 1 API in favour of Events 2 API.');
}

/**
 * List all core subsystems and their location
 *
 * This is a whitelist of components that are part of the core and their
 * language strings are defined in /lang/en/<<subsystem>>.php. If a given
 * plugin is not listed here and it does not have proper plugintype prefix,
 * then it is considered as course activity module.
 *
 * The location is optionally dirroot relative path. NULL means there is no special
 * directory for this subsystem. If the location is set, the subsystem's
 * renderer.php is expected to be there.
 *
 * @deprecated since 2.6, use core_component::get_core_subsystems()
 *
 * @param bool $fullpaths false means relative paths from dirroot, use true for performance reasons
 * @return array of (string)name => (string|null)location
 */
function get_core_subsystems($fullpaths = false) {
    global $CFG;

    // NOTE: do not add any other debugging here, keep forever.

    $subsystems = core_component::get_core_subsystems();

    if ($fullpaths) {
        return $subsystems;
    }

    debugging('Short paths are deprecated when using get_core_subsystems(), please fix the code to use fullpaths instead.', DEBUG_DEVELOPER);

    $dlength = strlen($CFG->dirroot);

    foreach ($subsystems as $k => $v) {
        if ($v === null) {
            continue;
        }
        $subsystems[$k] = substr($v, $dlength+1);
    }

    return $subsystems;
}

/**
 * Lists all plugin types.
 *
 * @deprecated since 2.6, use core_component::get_plugin_types()
 *
 * @param bool $fullpaths false means relative paths from dirroot
 * @return array Array of strings - name=>location
 */
function get_plugin_types($fullpaths = true) {
    global $CFG;

    // NOTE: do not add any other debugging here, keep forever.

    $types = core_component::get_plugin_types();

    if ($fullpaths) {
        return $types;
    }

    debugging('Short paths are deprecated when using get_plugin_types(), please fix the code to use fullpaths instead.', DEBUG_DEVELOPER);

    $dlength = strlen($CFG->dirroot);

    foreach ($types as $k => $v) {
        if ($k === 'theme') {
            $types[$k] = 'theme';
            continue;
        }
        $types[$k] = substr($v, $dlength+1);
    }

    return $types;
}

/**
 * Use when listing real plugins of one type.
 *
 * @deprecated since 2.6, use core_component::get_plugin_list()
 *
 * @param string $plugintype type of plugin
 * @return array name=>fulllocation pairs of plugins of given type
 */
function get_plugin_list($plugintype) {

    // NOTE: do not add any other debugging here, keep forever.

    if ($plugintype === '') {
        $plugintype = 'mod';
    }

    return core_component::get_plugin_list($plugintype);
}

/**
 * Get a list of all the plugins of a given type that define a certain class
 * in a certain file. The plugin component names and class names are returned.
 *
 * @deprecated since 2.6, use core_component::get_plugin_list_with_class()
 *
 * @param string $plugintype the type of plugin, e.g. 'mod' or 'report'.
 * @param string $class the part of the name of the class after the
 *      frankenstyle prefix. e.g 'thing' if you are looking for classes with
 *      names like report_courselist_thing. If you are looking for classes with
 *      the same name as the plugin name (e.g. qtype_multichoice) then pass ''.
 * @param string $file the name of file within the plugin that defines the class.
 * @return array with frankenstyle plugin names as keys (e.g. 'report_courselist', 'mod_forum')
 *      and the class names as values (e.g. 'report_courselist_thing', 'qtype_multichoice').
 */
function get_plugin_list_with_class($plugintype, $class, $file) {

    // NOTE: do not add any other debugging here, keep forever.

    return core_component::get_plugin_list_with_class($plugintype, $class, $file);
}

/**
 * Returns the exact absolute path to plugin directory.
 *
 * @deprecated since 2.6, use core_component::get_plugin_directory()
 *
 * @param string $plugintype type of plugin
 * @param string $name name of the plugin
 * @return string full path to plugin directory; NULL if not found
 */
function get_plugin_directory($plugintype, $name) {

    // NOTE: do not add any other debugging here, keep forever.

    if ($plugintype === '') {
        $plugintype = 'mod';
    }

    return core_component::get_plugin_directory($plugintype, $name);
}

/**
 * Normalize the component name using the "frankenstyle" names.
 *
 * @deprecated since 2.6, use core_component::normalize_component()
 *
 * @param string $component
 * @return array two-items list of [(string)type, (string|null)name]
 */
function normalize_component($component) {

    // NOTE: do not add any other debugging here, keep forever.

    return core_component::normalize_component($component);
}

/**
 * Return exact absolute path to a plugin directory.
 *
 * @deprecated since 2.6, use core_component::normalize_component()
 *
 * @param string $component name such as 'moodle', 'mod_forum'
 * @return string full path to component directory; NULL if not found
 */
function get_component_directory($component) {

    // NOTE: do not add any other debugging here, keep forever.

    return core_component::get_component_directory($component);
}

/**
 * Get the context instance as an object. This function will create the
 * context instance if it does not exist yet.
 *
 * @deprecated since 2.2, use context_course::instance() or other relevant class instead
 * @todo This will be deleted in Moodle 2.8, refer MDL-34472
 * @param integer $contextlevel The context level, for example CONTEXT_COURSE, or CONTEXT_MODULE.
 * @param integer $instance The instance id. For $level = CONTEXT_COURSE, this would be $course->id,
 *      for $level = CONTEXT_MODULE, this would be $cm->id. And so on. Defaults to 0
 * @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
 *      MUST_EXIST means throw exception if no record or multiple records found
 * @return context The context object.
 */
function get_context_instance($contextlevel, $instance = 0, $strictness = IGNORE_MISSING) {

    debugging('get_context_instance() is deprecated, please use context_xxxx::instance() instead.', DEBUG_DEVELOPER);

    $instances = (array)$instance;
    $contexts = array();

    $classname = context_helper::get_class_for_level($contextlevel);

    // we do not load multiple contexts any more, PAGE should be responsible for any preloading
    foreach ($instances as $inst) {
        $contexts[$inst] = $classname::instance($inst, $strictness);
    }

    if (is_array($instance)) {
        return $contexts;
    } else {
        return $contexts[$instance];
    }
}
/* === End of long term deprecated api list === */

/**
 * @deprecated since 2.7 - use new file picker instead
 */
function clam_log_upload() {
    throw new coding_exception('clam_log_upload() can not be used any more, please use file picker instead');
}

/**
 * @deprecated since 2.7 - use new file picker instead
 */
function clam_log_infected() {
    throw new coding_exception('clam_log_infected() can not be used any more, please use file picker instead');
}

/**
 * @deprecated since 2.7 - use new file picker instead
 */
function clam_change_log() {
    throw new coding_exception('clam_change_log() can not be used any more, please use file picker instead');
}

/**
 * @deprecated since 2.7 - infected files are now deleted in file picker
 */
function clam_replace_infected_file() {
    throw new coding_exception('clam_replace_infected_file() can not be used any more, please use file picker instead');
}

/**
 * @deprecated since 2.7
 */
function clam_handle_infected_file() {
    throw new coding_exception('clam_handle_infected_file() can not be used any more, please use file picker instead');
}

/**
 * @deprecated since 2.7
 */
function clam_scan_moodle_file() {
    throw new coding_exception('clam_scan_moodle_file() can not be used any more, please use file picker instead');
}


/**
 * @deprecated since 2.7 PHP 5.4.x should be always compatible.
 */
function password_compat_not_supported() {
    throw new coding_exception('Do not use password_compat_not_supported() - bcrypt is now always available');
}

/**
 * @deprecated since 2.6
 */
function session_get_instance() {
    throw new coding_exception('session_get_instance() is removed, use \core\session\manager instead');
}

/**
 * @deprecated since 2.6
 */
function session_is_legacy() {
    throw new coding_exception('session_is_legacy() is removed, do not use any more');
}

/**
 * @deprecated since 2.6
 */
function session_kill_all() {
    throw new coding_exception('session_kill_all() is removed, use \core\session\manager::kill_all_sessions() instead');
}

/**
 * @deprecated since 2.6
 */
function session_touch() {
    throw new coding_exception('session_touch() is removed, use \core\session\manager::touch_session() instead');
}

/**
 * @deprecated since 2.6
 */
function session_kill() {
    throw new coding_exception('session_kill() is removed, use \core\session\manager::kill_session() instead');
}

/**
 * @deprecated since 2.6
 */
function session_kill_user() {
    throw new coding_exception('session_kill_user() is removed, use \core\session\manager::kill_user_sessions() instead');
}

/**
 * @deprecated since 2.6
 */
function session_set_user() {
    throw new coding_exception('session_set_user() is removed, use \core\session\manager::set_user() instead');
}

/**
 * @deprecated since 2.6
 */
function session_is_loggedinas() {
    throw new coding_exception('session_is_loggedinas() is removed, use \core\session\manager::is_loggedinas() instead');
}

/**
 * @deprecated since 2.6
 */
function session_get_realuser() {
    throw new coding_exception('session_get_realuser() is removed, use \core\session\manager::get_realuser() instead');
}

/**
 * @deprecated since 2.6
 */
function session_loginas() {
    throw new coding_exception('session_loginas() is removed, use \core\session\manager::loginas() instead');
}

/**
 * @deprecated since 2.6
 */
function js_minify() {
    throw new coding_exception('js_minify() is removed, use core_minify::js_files() or core_minify::js() instead.');
}

/**
 * @deprecated since 2.6
 */
function css_minify_css() {
    throw new coding_exception('css_minify_css() is removed, use core_minify::css_files() or core_minify::css() instead.');
}

// === Deprecated before 2.6.0 ===

/**
 * @deprecated
 */
function check_gd_version() {
    throw new coding_exception('check_gd_version() is removed, GD extension is always available now');
}

/**
 * @deprecated
 */
function update_login_count() {
    throw new coding_exception('update_login_count() is removed, all calls need to be removed');
}

/**
 * @deprecated
 */
function reset_login_count() {
    throw new coding_exception('reset_login_count() is removed, all calls need to be removed');
}

/**
 * @deprecated
 */
function update_log_display_entry() {

    throw new coding_exception('The update_log_display_entry() is removed, please use db/log.php description file instead.');
}

/**
 * @deprecated use the text formatting in a standard way instead (http://docs.moodle.org/dev/Output_functions)
 *             this was abused mostly for embedding of attachments
 */
function filter_text() {
    throw new coding_exception('filter_text() can not be used anymore, use format_text(), format_string() etc instead.');
}

/**
 * @deprecated Loginhttps is no longer supported
 */
function httpsrequired() {
    throw new coding_exception('httpsrequired() can not be used any more. Loginhttps is no longer supported.');
}

/**
 * @deprecated since 3.1 - replacement legacy file API methods can be found on the moodle_url class, for example:
 * The moodle_url::make_legacyfile_url() method can be used to generate a legacy course file url. To generate
 * course module file.php url the moodle_url::make_file_url() should be used.
 */
function get_file_url() {
    throw new coding_exception('get_file_url() can not be used anymore. Please use ' .
        'moodle_url factory methods instead.');
}

/**
 * @deprecated use get_enrolled_users($context) instead.
 */
function get_course_participants() {
    throw new coding_exception('get_course_participants() can not be used any more, use get_enrolled_users() instead.');
}

/**
 * @deprecated use is_enrolled($context, $userid) instead.
 */
function is_course_participant() {
    throw new coding_exception('is_course_participant() can not be used any more, use is_enrolled() instead.');
}

/**
 * @deprecated
 */
function get_recent_enrolments() {
    throw new coding_exception('get_recent_enrolments() is removed as it returned inaccurate results.');
}

/**
 * @deprecated use clean_param($string, PARAM_FILE) instead.
 */
function detect_munged_arguments() {
    throw new coding_exception('detect_munged_arguments() can not be used any more, please use clean_param(,PARAM_FILE) instead.');
}


/**
 * Unzip one zip file to a destination dir
 * Both parameters must be FULL paths
 * If destination isn't specified, it will be the
 * SAME directory where the zip file resides.
 *
 * @global object
 * @param string $zipfile The zip file to unzip
 * @param string $destination The location to unzip to
 * @param bool $showstatus_ignored Unused
 * @deprecated since 2.0 MDL-15919
 */
function unzip_file($zipfile, $destination = '', $showstatus_ignored = true) {
    debugging(__FUNCTION__ . '() is deprecated. '
            . 'Please use the application/zip file_packer implementation instead.', DEBUG_DEVELOPER);

    // Extract everything from zipfile.
    $path_parts = pathinfo(cleardoubleslashes($zipfile));
    $zippath = $path_parts["dirname"];       //The path of the zip file
    $zipfilename = $path_parts["basename"];  //The name of the zip file
    $extension = $path_parts["extension"];    //The extension of the file

    //If no file, error
    if (empty($zipfilename)) {
        return false;
    }

    //If no extension, error
    if (empty($extension)) {
        return false;
    }

    //Clear $zipfile
    $zipfile = cleardoubleslashes($zipfile);

    //Check zipfile exists
    if (!file_exists($zipfile)) {
        return false;
    }

    //If no destination, passed let's go with the same directory
    if (empty($destination)) {
        $destination = $zippath;
    }

    //Clear $destination
    $destpath = rtrim(cleardoubleslashes($destination), "/");

    //Check destination path exists
    if (!is_dir($destpath)) {
        return false;
    }

    $packer = get_file_packer('application/zip');

    $result = $packer->extract_to_pathname($zipfile, $destpath);

    if ($result === false) {
        return false;
    }

    foreach ($result as $status) {
        if ($status !== true) {
            return false;
        }
    }

    return true;
}

/**
 * Zip an array of files/dirs to a destination zip file
 * Both parameters must be FULL paths to the files/dirs
 *
 * @global object
 * @param array $originalfiles Files to zip
 * @param string $destination The destination path
 * @return bool Outcome
 *
 * @deprecated since 2.0 MDL-15919
 */
function zip_files($originalfiles, $destination) {
    debugging(__FUNCTION__ . '() is deprecated. '
            . 'Please use the application/zip file_packer implementation instead.', DEBUG_DEVELOPER);

    // Extract everything from destination.
    $path_parts = pathinfo(cleardoubleslashes($destination));
    $destpath = $path_parts["dirname"];       //The path of the zip file
    $destfilename = $path_parts["basename"];  //The name of the zip file
    $extension = $path_parts["extension"];    //The extension of the file

    //If no file, error
    if (empty($destfilename)) {
        return false;
    }

    //If no extension, add it
    if (empty($extension)) {
        $extension = 'zip';
        $destfilename = $destfilename.'.'.$extension;
    }

    //Check destination path exists
    if (!is_dir($destpath)) {
        return false;
    }

    //Check destination path is writable. TODO!!

    //Clean destination filename
    $destfilename = clean_filename($destfilename);

    //Now check and prepare every file
    $files = array();
    $origpath = NULL;

    foreach ($originalfiles as $file) {  //Iterate over each file
        //Check for every file
        $tempfile = cleardoubleslashes($file); // no doubleslashes!
        //Calculate the base path for all files if it isn't set
        if ($origpath === NULL) {
            $origpath = rtrim(cleardoubleslashes(dirname($tempfile)), "/");
        }
        //See if the file is readable
        if (!is_readable($tempfile)) {  //Is readable
            continue;
        }
        //See if the file/dir is in the same directory than the rest
        if (rtrim(cleardoubleslashes(dirname($tempfile)), "/") != $origpath) {
            continue;
        }
        //Add the file to the array
        $files[] = $tempfile;
    }

    $zipfiles = array();
    $start = strlen($origpath)+1;
    foreach($files as $file) {
        $zipfiles[substr($file, $start)] = $file;
    }

    $packer = get_file_packer('application/zip');

    return $packer->archive_to_pathname($zipfiles, $destpath . '/' . $destfilename);
}

/**
 * @deprecated use groups_get_all_groups() instead.
 */
function mygroupid() {
    throw new coding_exception('mygroupid() can not be used any more, please use groups_get_all_groups() instead.');
}

/**
 * @deprecated since Moodle 2.0 MDL-14617 - please do not use this function any more.
 */
function groupmode() {
    throw new coding_exception('groupmode() can not be used any more, please use groups_get_* instead.');
}

/**
 * @deprecated Since year 2006 - please do not use this function any more.
 */
function set_current_group() {
    throw new coding_exception('set_current_group() can not be used anymore, please use $SESSION->currentgroup[$courseid] instead');
}

/**
 * @deprecated Since year 2006 - please do not use this function any more.
 */
function get_current_group() {
    throw new coding_exception('get_current_group() can not be used any more, please use groups_get_* instead');
}

/**
 * @deprecated Since Moodle 2.8
 */
function groups_filter_users_by_course_module_visible() {
    throw new coding_exception('groups_filter_users_by_course_module_visible() is removed. ' .
            'Replace with a call to \core_availability\info_module::filter_user_list(), ' .
            'which does basically the same thing but includes other restrictions such ' .
            'as profile restrictions.');
}

/**
 * @deprecated Since Moodle 2.8
 */
function groups_course_module_visible() {
    throw new coding_exception('groups_course_module_visible() is removed, use $cm->uservisible to decide whether the current
        user can ' . 'access an activity.', DEBUG_DEVELOPER);
}

/**
 * @deprecated since 2.0
 */
function error() {
    throw new coding_exception('notlocalisederrormessage', 'error', $link, $message, 'error() is a removed, please call
            print_error() instead of error()');
}


/**
 * @deprecated use $PAGE->theme->name instead.
 */
function current_theme() {
    throw new coding_exception('current_theme() can not be used any more, please use $PAGE->theme->name instead');
}

/**
 * @deprecated
 */
function formerr() {
    throw new coding_exception('formerr() is removed. Please change your code to use $OUTPUT->error_text($string).');
}

/**
 * @deprecated use $OUTPUT->skip_link_target() in instead.
 */
function skip_main_destination() {
    throw new coding_exception('skip_main_destination() can not be used any more, please use $OUTPUT->skip_link_target() instead.');
}

/**
 * @deprecated use $OUTPUT->container() instead.
 */
function print_container() {
    throw new coding_exception('print_container() can not be used any more. Please use $OUTPUT->container() instead.');
}

/**
 * @deprecated use $OUTPUT->container_start() instead.
 */
function print_container_start() {
    throw new coding_exception('print_container_start() can not be used any more. Please use $OUTPUT->container_start() instead.');
}

/**
 * @deprecated use $OUTPUT->container_end() instead.
 */
function print_container_end() {
    throw new coding_exception('print_container_end() can not be used any more. Please use $OUTPUT->container_end() instead.');
}

/**
 * @deprecated since Moodle 2.0 MDL-19077 - use $OUTPUT->notification instead.
 */
function notify() {
    throw new coding_exception('notify() is removed, please use $OUTPUT->notification() instead');
}

/**
 * @deprecated use $OUTPUT->continue_button() instead.
 */
function print_continue() {
    throw new coding_exception('print_continue() can not be used any more. Please use $OUTPUT->continue_button() instead.');
}

/**
 * @deprecated use $PAGE methods instead.
 */
function print_header() {

    throw new coding_exception('print_header() can not be used any more. Please use $PAGE methods instead.');
}

/**
 * @deprecated use $PAGE methods instead.
 */
function print_header_simple() {

    throw new coding_exception('print_header_simple() can not be used any more. Please use $PAGE methods instead.');
}

/**
 * @deprecated use $OUTPUT->block() instead.
 */
function print_side_block() {
    throw new coding_exception('print_side_block() can not be used any more, please use $OUTPUT->block() instead.');
}

/**
 * Prints a basic textarea field.
 *
 * This was 'deprecated' in 2.0, but not properly (there was no alternative) so the
 * debugging message was commented out.
 *
 * @deprecated since Moodle 3.6
 *
 * When using this function, you should
 *
 * @global object
 * @param bool $unused No longer used.
 * @param int $rows Number of rows to display  (minimum of 10 when $height is non-null)
 * @param int $cols Number of columns to display (minimum of 65 when $width is non-null)
 * @param null $width (Deprecated) Width of the element; if a value is passed, the minimum value for $cols will be 65. Value is otherwise ignored.
 * @param null $height (Deprecated) Height of the element; if a value is passe, the minimum value for $rows will be 10. Value is otherwise ignored.
 * @param string $name Name to use for the textarea element.
 * @param string $value Initial content to display in the textarea.
 * @param int $obsolete deprecated
 * @param bool $return If false, will output string. If true, will return string value.
 * @param string $id CSS ID to add to the textarea element.
 * @return string|void depending on the value of $return
 */
function print_textarea($unused, $rows, $cols, $width, $height, $name, $value='', $obsolete=0, $return=false, $id='') {
    /// $width and height are legacy fields and no longer used as pixels like they used to be.
    /// However, you can set them to zero to override the mincols and minrows values below.

    // Disabling because there is not yet a viable $OUTPUT option for cases when mforms can't be used
    debugging('print_textarea() is deprecated. Please use $OUTPUT->print_textarea() instead.', DEBUG_DEVELOPER);

    global $OUTPUT;

    $mincols = 65;
    $minrows = 10;

    if ($id === '') {
        $id = 'edit-'.$name;
    }

    if ($height && ($rows < $minrows)) {
        $rows = $minrows;
    }
    if ($width && ($cols < $mincols)) {
        $cols = $mincols;
    }

    $textarea = $OUTPUT->print_textarea($name, $id, $value, $rows, $cols);
    if ($return) {
        return $textarea;
    }

    echo $textarea;
}

/**
 * Returns an image of an up or down arrow, used for column sorting. To avoid unnecessary DB accesses, please
 * provide this function with the language strings for sortasc and sortdesc.
 *
 * @deprecated use $OUTPUT->arrow() instead.
 * @todo final deprecation of this function once MDL-45448 is resolved
 *
 * If no sort string is associated with the direction, an arrow with no alt text will be printed/returned.
 *
 * @global object
 * @param string $direction 'up' or 'down'
 * @param string $strsort The language string used for the alt attribute of this image
 * @param bool $return Whether to print directly or return the html string
 * @return string|void depending on $return
 *
 */
function print_arrow($direction='up', $strsort=null, $return=false) {
    global $OUTPUT;

    debugging('print_arrow() is deprecated. Please use $OUTPUT->arrow() instead.', DEBUG_DEVELOPER);

    if (!in_array($direction, array('up', 'down', 'right', 'left', 'move'))) {
        return null;
    }

    $return = null;

    switch ($direction) {
        case 'up':
            $sortdir = 'asc';
            break;
        case 'down':
            $sortdir = 'desc';
            break;
        case 'move':
            $sortdir = 'asc';
            break;
        default:
            $sortdir = null;
            break;
    }

    // Prepare language string
    $strsort = '';
    if (empty($strsort) && !empty($sortdir)) {
        $strsort  = get_string('sort' . $sortdir, 'grades');
    }

    $return = ' ' . $OUTPUT->pix_icon('t/' . $direction, $strsort) . ' ';

    if ($return) {
        return $return;
    } else {
        echo $return;
    }
}

/**
 * @deprecated since Moodle 2.0
 */
function choose_from_menu() {
    throw new coding_exception('choose_from_menu() is removed. Please change your code to use html_writer::select().');
}

/**
 * @deprecated use $OUTPUT->help_icon_scale($courseid, $scale) instead.
 */
function print_scale_menu_helpbutton() {
    throw new coding_exception('print_scale_menu_helpbutton() can not be used any more. '.
        'Please use $OUTPUT->help_icon_scale($courseid, $scale) instead.');
}

/**
 * @deprecated use html_writer::checkbox() instead.
 */
function print_checkbox() {
    throw new coding_exception('print_checkbox() can not be used any more. Please use html_writer::checkbox() instead.');
}

/**
 * @deprecated since Moodle 3.2
 */
function update_module_button() {
    throw new coding_exception('update_module_button() can not be used anymore. Activity modules should ' .
        'not add the edit module button, the link is already available in the Administration block. Themes ' .
        'can choose to display the link in the buttons row consistently for all module types.');
}

/**
 * @deprecated use $OUTPUT->navbar() instead
 */
function print_navigation () {
    throw new coding_exception('print_navigation() can not be used any more, please update use $OUTPUT->navbar() instead.');
}

/**
 * @deprecated Please use $PAGE->navabar methods instead.
 */
function build_navigation() {
    throw new coding_exception('build_navigation() can not be used any more, please use $PAGE->navbar methods instead.');
}

/**
 * @deprecated not relevant with global navigation in Moodle 2.x+
 */
function navmenu() {
    throw new coding_exception('navmenu() can not be used any more, it is no longer relevant with global navigation.');
}

/// CALENDAR MANAGEMENT  ////////////////////////////////////////////////////////////////


/**
 * @deprecated please use calendar_event::create() instead.
 */
function add_event() {
    throw new coding_exception('add_event() can not be used any more, please use calendar_event::create() instead.');
}

/**
 * @deprecated please calendar_event->update() instead.
 */
function update_event() {
    throw new coding_exception('update_event() is removed, please use calendar_event->update() instead.');
}

/**
 * @deprecated please use calendar_event->delete() instead.
 */
function delete_event() {
    throw new coding_exception('delete_event() can not be used any more, please use '.
        'calendar_event->delete() instead.');
}

/**
 * @deprecated please use calendar_event->toggle_visibility(false) instead.
 */
function hide_event() {
    throw new coding_exception('hide_event() can not be used any more, please use '.
        'calendar_event->toggle_visibility(false) instead.');
}

/**
 * @deprecated please use calendar_event->toggle_visibility(true) instead.
 */
function show_event() {
    throw new coding_exception('show_event() can not be used any more, please use '.
        'calendar_event->toggle_visibility(true) instead.');
}

/**
 * @deprecated since Moodle 2.2 use core_text::xxxx() instead.
 */
function textlib_get_instance() {
    throw new coding_exception('textlib_get_instance() can not be used any more, please use '.
        'core_text::functioname() instead.');
}

/**
 * @deprecated since 2.4
 */
function get_generic_section_name() {
    throw new coding_exception('get_generic_section_name() is deprecated. Please use appropriate functionality from class format_base');
}

/**
 * @deprecated since 2.4
 */
function get_all_sections() {
    throw new coding_exception('get_all_sections() is removed. See phpdocs for this function');
}

/**
 * @deprecated since 2.4
 */
function add_mod_to_section() {
    throw new coding_exception('Function add_mod_to_section() is removed, please use course_add_cm_to_section()');
}

/**
 * @deprecated since 2.4
 */
function get_all_mods() {
    throw new coding_exception('Function get_all_mods() is removed. Use get_fast_modinfo() and get_module_types_names() instead. See phpdocs for details');
}

/**
 * @deprecated since 2.4
 */
function get_course_section() {
    throw new coding_exception('Function get_course_section() is removed. Please use course_create_sections_if_missing() and get_fast_modinfo() instead.');
}

/**
 * @deprecated since 2.4
 */
function format_weeks_get_section_dates() {
    throw new coding_exception('Function format_weeks_get_section_dates() is removed. It is not recommended to'.
            ' use it outside of format_weeks plugin');
}

/**
 * @deprecated since 2.5
 */
function get_print_section_cm_text() {
    throw new coding_exception('Function get_print_section_cm_text() is removed. Please use '.
            'cm_info::get_formatted_content() and cm_info::get_formatted_name()');
}

/**
 * @deprecated since 2.5
 */
function print_section_add_menus() {
    throw new coding_exception('Function print_section_add_menus() is removed. Please use course renderer '.
            'function course_section_add_cm_control()');
}

/**
 * @deprecated since 2.5. Please use:
 * $courserenderer = $PAGE->get_renderer('core', 'course');
 * $actions = course_get_cm_edit_actions($mod, $indent, $section);
 * return ' ' . $courserenderer->course_section_cm_edit_actions($actions);
 */
function make_editing_buttons() {
    throw new coding_exception('Function make_editing_buttons() is removed, please see PHPdocs in '.
            'lib/deprecatedlib.php on how to replace it');
}

/**
 * @deprecated since 2.5
 */
function print_section() {
    throw new coding_exception('Function print_section() is removed. Please use course renderer function '.
            'course_section_cm_list() instead.');
}

/**
 * @deprecated since 2.5
 */
function print_overview() {
    throw new coding_exception('Function print_overview() is removed. Use block course_overview to display this information');
}

/**
 * @deprecated since 2.5
 */
function print_recent_activity() {
    throw new coding_exception('Function print_recent_activity() is removed. It is not recommended to'.
            ' use it outside of block_recent_activity');
}

/**
 * @deprecated since 2.5
 */
function delete_course_module() {
    throw new coding_exception('Function delete_course_module() is removed. Please use course_delete_module() instead.');
}

/**
 * @deprecated since 2.5
 */
function update_category_button() {
    throw new coding_exception('Function update_category_button() is removed. Pages to view '.
            'and edit courses are now separate and no longer depend on editing mode.');
}

/**
 * @deprecated since 2.5
 */
function make_categories_list() {
    throw new coding_exception('Global function make_categories_list() is removed. Please use '.
        'core_course_category::make_categories_list() and core_course_category::get_parents()');
}

/**
 * @deprecated since 2.5
 */
function category_delete_move() {
    throw new coding_exception('Function category_delete_move() is removed. Please use ' .
        'core_course_category::delete_move() instead.');
}

/**
 * @deprecated since 2.5
 */
function category_delete_full() {
    throw new coding_exception('Function category_delete_full() is removed. Please use ' .
        'core_course_category::delete_full() instead.');
}

/**
 * @deprecated since 2.5
 */
function move_category() {
    throw new coding_exception('Function move_category() is removed. Please use core_course_category::change_parent() instead.');
}

/**
 * @deprecated since 2.5
 */
function course_category_hide() {
    throw new coding_exception('Function course_category_hide() is removed. Please use core_course_category::hide() instead.');
}

/**
 * @deprecated since 2.5
 */
function course_category_show() {
    throw new coding_exception('Function course_category_show() is removed. Please use core_course_category::show() instead.');
}

/**
 * @deprecated since 2.5. Please use core_course_category::get($catid, IGNORE_MISSING) or
 *     core_course_category::get($catid, MUST_EXIST).
 */
function get_course_category() {
    throw new coding_exception('Function get_course_category() is removed. Please use core_course_category::get(), ' .
        'see phpdocs for more details');
}

/**
 * @deprecated since 2.5
 */
function create_course_category() {
    throw new coding_exception('Function create_course_category() is removed. Please use core_course_category::create(), ' .
        'see phpdocs for more details');
}

/**
 * @deprecated since 2.5. Please use core_course_category::get() and core_course_category::get_children()
 */
function get_all_subcategories() {
    throw new coding_exception('Function get_all_subcategories() is removed. Please use appropriate methods() '.
        'of core_course_category class. See phpdocs for more details');
}

/**
 * @deprecated since 2.5. Please use core_course_category::get($parentid)->get_children().
 */
function get_child_categories() {
    throw new coding_exception('Function get_child_categories() is removed. Use core_course_category::get_children() or see ' .
        'phpdocs for more details.');
}

/**
 * @deprecated since 2.5
 */
function get_categories() {
    throw new coding_exception('Function get_categories() is removed. Please use ' .
            'appropriate functions from class core_course_category');
}

/**
* @deprecated since 2.5
*/
function print_course_search() {
    throw new coding_exception('Function print_course_search() is removed, please use course renderer');
}

/**
 * @deprecated since 2.5
 */
function print_my_moodle() {
    throw new coding_exception('Function print_my_moodle() is removed, please use course renderer ' .
            'function frontpage_my_courses()');
}

/**
 * @deprecated since 2.5
 */
function print_remote_course() {
    throw new coding_exception('Function print_remote_course() is removed, please use course renderer');
}

/**
 * @deprecated since 2.5
 */
function print_remote_host() {
    throw new coding_exception('Function print_remote_host() is removed, please use course renderer');
}

/**
 * @deprecated since 2.5
 */
function print_whole_category_list() {
    throw new coding_exception('Function print_whole_category_list() is removed, please use course renderer');
}

/**
 * @deprecated since 2.5
 */
function print_category_info() {
    throw new coding_exception('Function print_category_info() is removed, please use course renderer');
}

/**
 * @deprecated since 2.5
 */
function get_course_category_tree() {
    throw new coding_exception('Function get_course_category_tree() is removed, please use course ' .
            'renderer or core_course_category class, see function phpdocs for more info');
}

/**
 * @deprecated since 2.5
 */
function print_courses() {
    throw new coding_exception('Function print_courses() is removed, please use course renderer');
}

/**
 * @deprecated since 2.5
 */
function print_course() {
    throw new coding_exception('Function print_course() is removed, please use course renderer');
}

/**
 * @deprecated since 2.5
 */
function get_category_courses_array() {
    throw new coding_exception('Function get_category_courses_array() is removed, please use methods of ' .
        'core_course_category class');
}

/**
 * @deprecated since 2.5
 */
function get_category_courses_array_recursively() {
    throw new coding_exception('Function get_category_courses_array_recursively() is removed, please use ' .
        'methods of core_course_category class', DEBUG_DEVELOPER);
}

/**
 * @deprecated since Moodle 2.5 MDL-27814 - please do not use this function any more.
 */
function blog_get_context_url() {
    throw new coding_exception('Function  blog_get_context_url() is removed, getting params from context is not reliable for blogs.');
}

/**
 * @deprecated since 2.5
 */
function get_courses_wmanagers() {
    throw new coding_exception('Function get_courses_wmanagers() is removed, please use ' .
        'core_course_category::get_courses()');
}

/**
 * @deprecated since 2.5
 */
function convert_tree_to_html() {
    throw new coding_exception('Function convert_tree_to_html() is removed. Consider using class tabtree and core_renderer::render_tabtree()');
}

/**
 * @deprecated since 2.5
 */
function convert_tabrows_to_tree() {
    throw new coding_exception('Function convert_tabrows_to_tree() is removed. Consider using class tabtree');
}

/**
 * @deprecated since 2.5 - do not use, the textrotate.js will work it out automatically
 */
function can_use_rotated_text() {
    debugging('can_use_rotated_text() is removed. JS feature detection is used automatically.');
}

/**
 * @deprecated since Moodle 2.2 MDL-35009 - please do not use this function any more.
 */
function get_context_instance_by_id() {
    throw new coding_exception('get_context_instance_by_id() is now removed, please use context::instance_by_id($id) instead.');
}

/**
 * Returns system context or null if can not be created yet.
 *
 * @see context_system::instance()
 * @deprecated since 2.2
 * @param bool $cache use caching
 * @return context system context (null if context table not created yet)
 */
function get_system_context($cache = true) {
    debugging('get_system_context() is deprecated, please use context_system::instance() instead.', DEBUG_DEVELOPER);
    return context_system::instance(0, IGNORE_MISSING, $cache);
}

/**
 * @deprecated since 2.2, use $context->get_parent_context_ids() instead
 */
function get_parent_contexts() {
    throw new coding_exception('get_parent_contexts() is removed, please use $context->get_parent_context_ids() instead.');
}

/**
 * @deprecated since Moodle 2.2
 */
function get_parent_contextid() {
    throw new coding_exception('get_parent_contextid() is removed, please use $context->get_parent_context() instead.');
}

/**
 * @deprecated since 2.2
 */
function get_child_contexts() {
    throw new coding_exception('get_child_contexts() is removed, please use $context->get_child_contexts() instead.');
}

/**
 * @deprecated since 2.2
 */
function create_contexts() {
    throw new coding_exception('create_contexts() is removed, please use context_helper::create_instances() instead.');
}

/**
 * @deprecated since 2.2
 */
function cleanup_contexts() {
    throw new coding_exception('cleanup_contexts() is removed, please use context_helper::cleanup_instances() instead.');
}

/**
 * @deprecated since 2.2
 */
function build_context_path() {
    throw new coding_exception('build_context_path() is removed, please use context_helper::build_all_paths() instead.');
}

/**
 * @deprecated since 2.2
 */
function rebuild_contexts() {
    throw new coding_exception('rebuild_contexts() is removed, please use $context->reset_paths(true) instead.');
}

/**
 * @deprecated since Moodle 2.2
 */
function preload_course_contexts() {
    throw new coding_exception('preload_course_contexts() is removed, please use context_helper::preload_course() instead.');
}

/**
 * @deprecated since Moodle 2.2
 */
function context_moved() {
    throw new coding_exception('context_moved() is removed, please use context::update_moved() instead.');
}

/**
 * @deprecated since 2.2
 */
function fetch_context_capabilities() {
    throw new coding_exception('fetch_context_capabilities() is removed, please use $context->get_capabilities() instead.');
}

/**
 * @deprecated since 2.2
 */
function context_instance_preload() {
    throw new coding_exception('context_instance_preload() is removed, please use context_helper::preload_from_record() instead.');
}

/**
 * @deprecated since 2.2
 */
function get_contextlevel_name() {
    throw new coding_exception('get_contextlevel_name() is removed, please use context_helper::get_level_name() instead.');
}

/**
 * @deprecated since 2.2
 */
function print_context_name() {
    throw new coding_exception('print_context_name() is removed, please use $context->get_context_name() instead.');
}

/**
 * @deprecated since 2.2, use $context->mark_dirty() instead
 */
function mark_context_dirty() {
    throw new coding_exception('mark_context_dirty() is removed, please use $context->mark_dirty() instead.');
}

/**
 * @deprecated since Moodle 2.2
 */
function delete_context() {
    throw new coding_exception('delete_context() is removed, please use context_helper::delete_instance() ' .
            'or $context->delete_content() instead.');
}

/**
 * @deprecated since 2.2
 */
function get_context_url() {
    throw new coding_exception('get_context_url() is removed, please use $context->get_url() instead.');
}

/**
 * @deprecated since 2.2
 */
function get_course_context() {
    throw new coding_exception('get_course_context() is removed, please use $context->get_course_context(true) instead.');
}

/**
 * @deprecated since 2.2
 */
function get_user_courses_bycap() {
    throw new coding_exception('get_user_courses_bycap() is removed, please use enrol_get_users_courses() instead.');
}

/**
 * @deprecated since Moodle 2.2
 */
function get_role_context_caps() {
    throw new coding_exception('get_role_context_caps() is removed, it is really slow. Don\'t use it.');
}

/**
 * @deprecated since 2.2
 */
function get_courseid_from_context() {
    throw new coding_exception('get_courseid_from_context() is removed, please use $context->get_course_context(false) instead.');
}

/**
 * @deprecated since 2.2
 */
function context_instance_preload_sql() {
    throw new coding_exception('context_instance_preload_sql() is removed, please use context_helper::get_preload_record_columns_sql() instead.');
}

/**
 * @deprecated since 2.2
 */
function get_related_contexts_string() {
    throw new coding_exception('get_related_contexts_string() is removed, please use $context->get_parent_context_ids(true) instead.');
}

/**
 * @deprecated since 2.6
 */
function get_plugin_list_with_file() {
    throw new coding_exception('get_plugin_list_with_file() is removed, please use core_component::get_plugin_list_with_file() instead.');
}

/**
 * @deprecated since 2.6
 */
function check_browser_operating_system() {
    throw new coding_exception('check_browser_operating_system is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function check_browser_version() {
    throw new coding_exception('check_browser_version is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function get_device_type() {
    throw new coding_exception('get_device_type is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function get_device_type_list() {
    throw new coding_exception('get_device_type_list is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function get_selected_theme_for_device_type() {
    throw new coding_exception('get_selected_theme_for_device_type is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function get_device_cfg_var_name() {
    throw new coding_exception('get_device_cfg_var_name is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function set_user_device_type() {
    throw new coding_exception('set_user_device_type is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function get_user_device_type() {
    throw new coding_exception('get_user_device_type is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since 2.6
 */
function get_browser_version_classes() {
    throw new coding_exception('get_browser_version_classes is removed, please update your code to use core_useragent instead.');
}

/**
 * @deprecated since Moodle 2.6
 */
function generate_email_supportuser() {
    throw new coding_exception('generate_email_supportuser is removed, please use core_user::get_support_user');
}

/**
 * @deprecated since Moodle 2.6
 */
function badges_get_issued_badge_info() {
    throw new coding_exception('Function badges_get_issued_badge_info() is removed. Please use core_badges_assertion class and methods to generate badge assertion.');
}

/**
 * @deprecated since 2.6
 */
function can_use_html_editor() {
    throw new coding_exception('can_use_html_editor is removed, please update your code to assume it returns true.');
}


/**
 * @deprecated since Moodle 2.7, use {@link user_count_login_failures()} instead.
 */
function count_login_failures() {
    throw new coding_exception('count_login_failures() can not be used any more, please use user_count_login_failures().');
}

/**
 * @deprecated since 2.7 MDL-33099/MDL-44088 - please do not use this function any more.
 */
function ajaxenabled() {
    throw new coding_exception('ajaxenabled() can not be used anymore. Update your code to work with JS at all times.');
}

/**
 * @deprecated Since Moodle 2.7 MDL-44070
 */
function coursemodule_visible_for_user() {
    throw new coding_exception('coursemodule_visible_for_user() can not be used any more,
            please use \core_availability\info_module::is_user_visible()');
}

/**
 * @deprecated since Moodle 2.8 MDL-36014, MDL-35618 this functionality is removed
 */
function enrol_cohort_get_cohorts() {
    throw new coding_exception('Function enrol_cohort_get_cohorts() is removed, use '.
        'cohort_get_available_cohorts() instead');
}

/**
 * @deprecated since Moodle 2.8 MDL-36014 please use cohort_can_view_cohort()
 */
function enrol_cohort_can_view_cohort() {
    throw new coding_exception('Function enrol_cohort_can_view_cohort() is removed, use cohort_can_view_cohort() instead');
}

/**
 * @deprecated since Moodle 2.8 MDL-36014 use cohort_get_available_cohorts() instead
 */
function cohort_get_visible_list() {
    throw new coding_exception('Function cohort_get_visible_list() is removed. Please use function cohort_get_available_cohorts() ".
        "that correctly checks capabilities.');
}

/**
 * @deprecated since Moodle 2.8 MDL-35618 this functionality is removed
 */
function enrol_cohort_enrol_all_users() {
    throw new coding_exception('enrol_cohort_enrol_all_users() is removed. This functionality is moved to enrol_manual.');
}

/**
 * @deprecated since Moodle 2.8 MDL-35618 this functionality is removed
 */
function enrol_cohort_search_cohorts() {
    throw new coding_exception('enrol_cohort_search_cohorts() is re…

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