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   1  This files describes API changes in core libraries and APIs,
   2  information provided here is intended especially for developers.
   3  
   4  === 3.2 ===
   5  
   6  * Node.js versions >=4 are now required to run grunt.
   7  * JQuery has been updated to 3.1.0. JQuery migrate plugins are no longer shipped - please read
   8    https://jquery.com/upgrade-guide/3.0/ and update your javascript.
   9  * New option 'blanktarget' added to format_text. This option adds target="_blank" to links
  10  * A new webservice structure `external_files` has been created which provides a standardised view of files in Moodle and
  11    should be used for all file return descriptions.
  12    Files matching this format can be retrieved via the new `external_util::get_area_files` method.
  13    See MDL-54951 for further information.
  14  * The parameter $usepost of the following functions has been deprecated and is not used any more:
  15    - get_max_upload_file_size()
  16    - get_user_max_upload_file_size()
  17  * The following classes have been removed and should not be used any more:
  18      - boxclient - See MDL-49599 for more information.
  19  * The following functions have been removed and should not be used any more:
  20      - file_modify_html_header() - See MDL-29738 for more information.
  21  * core_grades_external::get_grades has been deprecated. Please do not call this function any more.
  22    External function gradereport_user_external::get_grades_table can be used for retrieving the course grades table.
  23    Please note that the information returned from that WS is intended for displaying (not for data consumption).
  24  * New option 'escape' added to format_string. When true (default), escapes HTML entities from the string
  25  * The following functions have been deprecated and are not used any more:
  26    - get_records_csv() Please use csv_import_reader::load_csv_content() instead.
  27    - put_records_csv() Please use download_as_dataformat (lib/dataformatlib.php) instead.
  28    - zip_files()   - See MDL-24343 for more information.
  29    - unzip_file()  - See MDL-24343 for more information.
  30  * The password_compat library was removed as it is no longer required.
  31  * Phpunit has been upgraded to 5.4.x and following has been deprecated and is not used any more:
  32    - setExpectedException(), use @expectedException or $this->expectException() and $this->expectExceptionMessage()
  33    - getMock(), use createMock() or getMockBuilder()->getMock()
  34    - UnitTestCase class is removed.
  35  * The following methods have been finally deprecated and should no longer be used:
  36    - course_modinfo::build_section_cache()
  37    - cm_info::get_deprecated_group_members_only()
  38    - cm_info::is_user_access_restricted_by_group()
  39  * The following methods in cm_info::standardmethods have also been finally deprecated and should no longer be used:
  40    - cm_info::get_after_edit_icons()
  41    - cm_info::get_after_link()
  42    - cm_info::get_content()
  43    - cm_info::get_custom_data()
  44    - cm_info::get_extra_classes()
  45    - cm_info::get_on_click()
  46    - cm_info::get_url()
  47    - cm_info::obtain_dynamic_data()
  48    Calling them through the magic method __call() will throw a coding exception.
  49  * The alfresco library has been removed from core. It was an old version of
  50    the library which was not compatible with newer versions of Alfresco.
  51  * Added down arrow: $OUTPUT->darrow.
  52  * All file_packer implementations now accept an additional parameter to allow a simple boolean return value instead of
  53    an array of individual file statuses.
  54  
  55  === 3.1 ===
  56  
  57  * Webservice function core_course_search_courses accepts a new parameter 'limittoenrolled' to filter the results
  58    only to courses the user is enrolled in, and are visible to them.
  59  * External functions that are not calling external_api::validate_context are buggy and will now generate
  60    exceptions. Previously they were only generating warnings in the webserver error log.
  61    See https://docs.moodle.org/dev/External_functions_API#Security
  62  * The moodle/blog:associatecourse and moodle/blog:associatemodule capabilities has been removed.
  63  * The following functions has been finally deprecated and can not be used any more:
  64      - profile_display_badges()
  65      - useredit_shared_definition_preferences()
  66      - calendar_normalize_tz()
  67      - get_user_timezone_offset()
  68      - get_timezone_offset()
  69      - get_list_of_timezones()
  70      - calculate_user_dst_table()
  71      - dst_changes_for_year()
  72      - get_timezone_record()
  73      - test_get_list_of_timezones()
  74      - test_get_timezone_offset()
  75      - test_get_user_timezone_offset()
  76  * The google api library has been updated to version 1.1.7. There was some important changes
  77    on the SSL handling. Now the SSL version will be determined by the underlying library.
  78    For more information see https://github.com/google/google-api-php-client/pull/644
  79  * The get_role_users() function will now add the $sort fields that are not part
  80    of the requested fields to the query result and will throw a debugging message
  81    with the added fields when that happens.
  82  * The core_user::fill_properties_cache() static method has been introduced to be a reference
  83    and allow standard user fields data validation. Right now only type validation is supported
  84    checking it against the parameter (PARAM_*) type of the target user field. MDL-52781 is
  85    going to add support to null/not null and choices validation, replacing the existing code to
  86    validate the user fields in different places in a common way.
  87  * Webservice function core_course_search_courses now returns results when the search string
  88    is less than 2 chars long.
  89  * Webservice function core_course_search_courses accepts a new parameter 'requiredcapabilities' to filter the results
  90    by the capabilities of the current user.
  91  * New mform element 'course' handles thousands of courses with good performance and usability.
  92  * The redirect() function will now redirect immediately if output has not
  93    already started. Messages will be displayed on the subsequent page using
  94    session notifications. The type of message output can be configured using the
  95    fourth parameter to redirect().
  96  * The specification of extra classes in the $OUTPUT->notification()
  97    function, and \core\output\notification renderable have been deprecated
  98    and will be removed in a future version.
  99    Notifications should use the levels found in \core\output\notification.
 100  * The constants for NOTIFY_PROBLEM, NOTIFY_REDIRECT, and NOTIFY_MESSAGE in
 101    \core\output\notification have been deprecated in favour of NOTIFY_ERROR,
 102    NOTIFY_WARNING, and NOTIFY_INFO respectively.
 103  * The following functions, previously used (exclusively) by upgrade steps are not available
 104    anymore because of the upgrade cleanup performed for this version. See MDL-51580 for more info:
 105      - upgrade_mysql_fix_unsigned_and_lob_columns()
 106      - upgrade_course_completion_remove_duplicates()
 107      - upgrade_save_orphaned_questions()
 108      - upgrade_rename_old_backup_files_using_shortname()
 109      - upgrade_mssql_nvarcharmax()
 110      - upgrade_mssql_varbinarymax()
 111      - upgrade_fix_missing_root_folders()
 112      - upgrade_course_modules_sequences()
 113      - upgrade_grade_item_fix_sortorder()
 114      - upgrade_availability_item()
 115  * A new parameter $ajaxformdata was added to the constructor for moodleform. When building a
 116    moodleform in a webservice or ajax script (for example using the new fragments API) we
 117    cannot allow the moodleform to parse it's own data from _GET and _POST - we must pass it as
 118    an array.
 119  * Plugins can extend the navigation for user by declaring the following callback:
 120    <frankenstyle>_extend_navigation_user(navigation_node $parentnode, stdClass $user,
 121                                          context_user $context, stdClass $course,
 122                                          context_course $coursecontext)
 123  * The function notify() now throws a debugging message - see MDL-50269.
 124  * Ajax calls going through lib/ajax/* now validate the return values before sending
 125    the response. If the validation does not pass an exception is raised. This behaviour
 126    is consistent with web services.
 127  * Several changes in Moodle core, standard plugins and third party libraries to
 128    ensure compatibility with PHP7. All plugins are recommended to perform testing
 129    against PHP7 as well. Refer to https://docs.moodle.org/dev/Moodle_and_PHP7 for more
 130    information. The following changes may affect you:
 131    * Class moodleform, moodleform_mod and some module classes have been changed to use
 132      __construct() for the constructor. Calling parent constructors by the class
 133      name will display debugging message. Incorrect: parent::moodleform(),
 134      correct: parent::__construct()
 135    * All form elements have also changed the constructor syntax. No changes are
 136      needed for using form elements, however if plugin defines new form element it
 137      needs to use correct syntax. For example, incorrect: parent::HTML_QuickForm_input(),
 138      HTML_QuickForm_input::HTML_QuickForm_input(), $this->HTML_QuickForm_input().
 139      Correct: HTML_QuickForm_input::__construct() or parent::__construct().
 140    * profile_field_base::profile_field_base() is deprecated, use parent::__construct()
 141      in custom profile fields constructors. Similar deprecations in exsiting
 142      profile_field_* classes.
 143    * user_filter_type::user_filter_type() is deprecated, use parent::__construct() in
 144      custom user filters. Similar deprecations in existing user_filter_* classes.
 145    * table_default_export_format_parent::table_default_export_format_parent() is
 146      deprecated, use parent::__construct() in extending classes.
 147  * groups_delete_group_members() $showfeedback parameter has been removed and is no longer
 148    respected. Users of this function should output their own feedback if required.
 149  * Number of changes to Tags API, see tag/upgrade.txt for more details
 150  * The previous events API handlers are being deprecated in favour of events 2 API, debugging messages are being displayed if
 151    there are 3rd party plugins using it. Switch to events 2 API please, see https://docs.moodle.org/dev/Event_2#Event_dispatching_and_observers
 152    Note than you will need to bump the plugin version so moodle is aware that you removed the plugin's event handlers.
 153  * mforms validation functions are not available in the global JS namespace anymore, event listeners
 154    are assigned to fields and buttons through a self-contained JS function.
 155  * Added $CFG->urlrewriteclass option to config.php allowing clean / semantic urls to
 156    be implemented in a plugin, eg local_cleanurls.
 157  * $CFG->pathtoclam global setting has been moved to clamav antivirus plugin setting of the same name.
 158  * clam_message_admins() and get_clam_error_code() have been deprecated, its functionality
 159    is now a part of \antivirus_clamav\scanner class methods.
 160  * \repository::antivir_scan_file() has been deprecated, \core\antivirus\manager::scan_file() that
 161    applies antivirus plugins is replacing its functionality.
 162  * Added core_text::str_max_bytes() which safely truncates multi-byte strings to a maximum number of bytes.
 163  * Zend Framework has been removed completely.
 164  * Any plugin can report when a scale is being used with the callback function [pluginname]_scale_used_anywhere(int $scaleid).
 165  * Changes in file_rewrite_pluginfile_urls: Passing a new option reverse = true in the $options var will make the function to convert
 166    actual URLs in $text to encoded URLs in the @@PLUGINFILE@@ form.
 167  * behat_util::is_server_running() is removed, please use behat_util::check_server_status() instead.
 168  * Behat\Mink\Selector\SelectorsHandler::xpathLiteral() method is deprecated use behat_context_helper::escape instead
 169    when building Xpath, or pass the unescaped value when using the named selector.',
 170  * table_sql download process is using the new data formats plugin which you can't use if you are buffering any output
 171      * flexible_table::get_download_menu(), considered private, has been deleted. Use
 172        $OUTPUT->download_dataformat_selector() instead.
 173    when building Xpath, or pass the unescaped value when using the named selector.
 174  * Add new file_is_executable(), to consistently check for executables even in Windows (PHP bug #41062).
 175  * Introduced new hooks for plugin developers.
 176      - <component>_pre_course_category_delete($category)
 177      - <component>_pre_course_delete($course)
 178      - <component>_pre_course_module_delete($cm)
 179      - <component>_pre_block_delete($instance)
 180      - <component>_pre_user_delete($user)
 181    These hooks allow developers to use the item in question before it is deleted by core. For example, if your plugin is
 182    a module (plugins located in the mod folder) called 'xxx' and you wish to interact with the user object before it is
 183    deleted then the function to create would be mod_xxx_pre_user_delete($user) in mod/xxx/lib.php.
 184  
 185  === 3.0 ===
 186  
 187  * Minify updated to 2.2.1
 188  * htmlpurifier upgraded to 4.7.0
 189  * Less.php upgraded to 1.7.0.9
 190  * The horde library has been updated to version 5.2.7.
 191  * Google libraries (lib/google) updated to 1.1.5
 192  * Html2Text library has been updated to the latest version of the library.
 193  * External functions x_is_allowed_from_ajax() methods have been deprecated. Define 'ajax' => true in db/services.php instead.
 194  * External functions can be called without a session if they define 'loginrequired' => true in db/services.php.
 195  * All plugins are required to declare their frankenstyle component name via
 196    the $plugin->component property in their version.php file. See
 197    https://docs.moodle.org/dev/version.php for details (MDL-48494).
 198  * PHPUnit is upgraded to 4.7. Some tests using deprecated assertions etc may need changes to work correctly.
 199  * Users of the text editor API to manually create a text editor should call set_text before calling use_editor.
 200  * Javascript - SimpleYUI and the Y instance used for modules have been merged. Y is now always the same instance of Y.
 201  * get_referer() has been deprecated, please use the get_local_referer function instead.
 202  * \core\progress\null is renamed to \core\progress\none for improved PHP7 compatibility as null is a reserved word (see MDL-50453).
 203  * \webservice_xmlrpc_client now respects proxy server settings. If your XMLRPC server is available on your local network and not via your proxy server, you may need to add it to the list of proxy
 204    server exceptions in $CFG->proxybypass. See MDL-39353 for details.
 205  * Group and groupings idnumbers can now be passed to and/or are returned from the following web services functions:
 206    ** core_group_external::create_groups
 207    ** core_group_external::get_groups
 208    ** core_group_external::get_course_groups
 209    ** core_group_external::create_groupings
 210    ** core_group_external::update_groupings
 211    ** core_group_external::get_groupings
 212    ** core_group_external::get_course_groupings
 213    ** core_group_external::get_course_user_groups
 214  * Following functions are removed from core. See MDL-50049 for details.
 215      password_compat_not_supported()
 216      session_get_instance()
 217      session_is_legacy()
 218      session_kill_all()
 219      session_touch()
 220      session_kill()
 221      session_kill_user()
 222      session_set_user()
 223      session_is_loggedinas()
 224      session_get_realuser()
 225      session_loginas()
 226      js_minify()
 227      css_minify_css()
 228      update_login_count()
 229      reset_login_count()
 230      check_gd_version()
 231      update_log_display_entry()
 232      get_recent_enrolments()
 233      groups_filter_users_by_course_module_visible()
 234      groups_course_module_visible()
 235      error()
 236      formerr()
 237      editorhelpbutton()
 238      editorshortcutshelpbutton()
 239      choose_from_menu()
 240      update_event()
 241      get_generic_section_name()
 242      get_all_sections()
 243      add_mod_to_section()
 244      get_all_mods()
 245      get_course_section()
 246      format_weeks_get_section_dates()
 247      get_print_section_cm_text()
 248      print_section_add_menus()
 249      make_editing_buttons()
 250      print_section()
 251      print_overview()
 252      print_recent_activity()
 253      delete_course_module()
 254      update_category_button()
 255      make_categories_list()
 256      category_delete_move()
 257      category_delete_full()
 258      move_category()
 259      course_category_hide()
 260      course_category_show()
 261      get_course_category()
 262      create_course_category()
 263      get_all_subcategories()
 264      get_child_categories()
 265      get_categories()
 266      print_course_search()
 267      print_my_moodle()
 268      print_remote_course()
 269      print_remote_host()
 270      print_whole_category_list()
 271      print_category_info()
 272      get_course_category_tree()
 273      print_courses()
 274      print_course()
 275      get_category_courses_array()
 276      get_category_courses_array_recursively()
 277      blog_get_context_url()
 278      get_courses_wmanagers()
 279      convert_tree_to_html()
 280      convert_tabrows_to_tree()
 281      can_use_rotated_text()
 282      get_parent_contexts()
 283      get_parent_contextid()
 284      get_child_contexts()
 285      create_contexts()
 286      cleanup_contexts()
 287      build_context_path()
 288      rebuild_contexts()
 289      preload_course_contexts()
 290      context_moved()
 291      fetch_context_capabilities()
 292      context_instance_preload()
 293      get_contextlevel_name()
 294      print_context_name()
 295      mark_context_dirty()
 296      delete_context()
 297      get_context_url()
 298      get_course_context()
 299      get_user_courses_bycap()
 300      get_role_context_caps()
 301      get_courseid_from_context()
 302      context_instance_preload_sql()
 303      get_related_contexts_string()
 304      get_plugin_list_with_file()
 305      check_browser_operating_system()
 306      check_browser_version()
 307      get_device_type()
 308      get_device_type_list()
 309      get_selected_theme_for_device_type()
 310      get_device_cfg_var_name()
 311      set_user_device_type()
 312      get_user_device_type()
 313      get_browser_version_classes()
 314      generate_email_supportuser()
 315      badges_get_issued_badge_info()
 316      can_use_html_editor()
 317      enrol_cohort_get_cohorts()
 318      enrol_cohort_can_view_cohort()
 319      cohort_get_visible_list()
 320      enrol_cohort_enrol_all_users()
 321      enrol_cohort_search_cohorts()
 322  * The never unused webdav_locks table was dropped.
 323  * The actionmenu hideMenu() function now expects an EventFacade object to be passed to it,
 324    i.e. a call to M.core.actionmenu.instance.hideMenu() should be change to M.core.actionmenu.instance.hideMenu(e)
 325  * In the html_editors (tinyMCE, Atto), the manage files button can be hidden by changing the 'enable_filemanagement' option to false.
 326  * external_api::validate_context now is public, it can be called from other classes.
 327  * rss_error() now supports returning of correct HTTP status of error and will return '404 Not Found'
 328    unless other status is specified.
 329  * Plugins can extend the navigation for categories settings by declaring the following callback:
 330    <frankenstyle>_extend_navigation_category_settings(navigation_node, context_coursecat)
 331  * The clilib.php provides two new functions cli_write() and cli_writeln() that should be used for outputting texts from the command
 332    line interface scripts.
 333  * External function core_course_external::get_course_contents returned parameter "name" has been changed to PARAM_RAW,
 334    this is because the new external_format_string function may return raw data if the global moodlewssettingraw parameter is used.
 335  * Function is_web_crawler() has been deprecated, please use core_useragent::is_web_crawler() instead.
 336  
 337  === 2.9.1 ===
 338  
 339  * New methods grade_grade::get_grade_max() and get_grade_min() must be used rather than directly the public properties rawgrademax and rawgrademin.
 340  * New method grade_item::is_aggregate_item() indicates when a grade_item is an aggreggated type grade.
 341  
 342  === 2.9 ===
 343  
 344  * The default home page for users has been changed to the dashboard (formely my home). See MDL-45774.
 345  * Support for rendering templates from php or javascript has been added. See MDL-49152.
 346  * Support for loading AMD javascript modules has been added. See MDL-49046.
 347  * Webservice core_course_delete_courses now return warning messages on any failures and does not try to rollback the entire deletion.
 348  * \core\event\course_viewed 'other' argument renamed from coursesectionid to coursesectionnumber as it contains the section number.
 349  * New API core_filetypes::add_type (etc.) allows custom filetypes to be added and modified.
 350  * PHPUnit: PHPMailer Sink is now started for all tests and is setup within the phpunit wrapper for advanced tests.
 351    Catching debugging messages when sending mail will no longer work. Use $sink = $this->redirectEmails(); and then check
 352    the message in the sink instead.
 353  * The file pluginlib.php was deprecated since 2.6 and has now been removed, do not include or require it.
 354  * \core_component::fetch_subsystems() now returns a valid path for completion component instead of null.
 355  * Deprecated JS global methods have been removed (show_item, destroy_item, hide_item, addonload, getElementsByTagName, findChildNodes).
 356  * For 3rd party plugin specific environment.xml files, it's now possible to specify version independent checks by using the
 357    <PLUGIN name="component_name"> tag instead of the version dependent <MOODLE version="x.y"> one. If the PLUGIN tag is used any
 358    Moodle specific tags will be ignored.
 359  * html_table: new API for adding captions to tables (new field, $table->caption) and subsequently hiding said captions from sighted users using accesshide (enabled using $table->captionhide).
 360  * The authorization procedure in the mdeploy.php script has been improved. The script
 361    now relies on the main config.php when deploying an available update.
 362  * sql_internal_reader and sql_select_reader interfaces have been deprecated in favour of sql_internal_table_reader
 363    and sql_reader which use iterators to be more memory efficient.
 364  * $CFG->enabletgzbackups setting has been removed as now backups are stored internally using .tar.gz format by default, you can
 365    set $CFG->usezipbackups to store them in zip format. This does not affect the restore process, which continues accepting both.
 366  * Added support for custom string manager implementations via $CFG->customstringmanager
 367    directive in the config.php. See MDL-49361 for details.
 368  * Add new make_request_directory() for creation of per-request files.
 369  * Added generate_image_thumbnail_from_string. This should be used instead of generate_image_thumbnail when the source is a string.
 370    This prevents the need to write files to disk unnecessarily.
 371  * Added generate_image_thumbnail to stored_file class. This should be used when generating thumbnails for stored files.
 372    This prevents the need to write files to disk unnecessarily.
 373  * Removed pear/HTTP/WebDav. See MDL-49534 for details.
 374  * Use standard PHP date time classes and methods - see new core_date class for timezone normalisation methods.
 375  * Moved lib/google/Google/ to lib/google/src/Google. This is to address autoloader issues with Google's provided autoloader
 376    for the library. See MDL-49519 for details.
 377  * The outdated lib/google/Google_Client.php and related files have been completely removed. To use
 378    the new client, read lib/google/readme_moodle.txt, please.
 379  * profile_display_badges() has been deprecated. See MDL-48935 for details.
 380  * Added a new method add_report_nodes() to pagelib.php. If you are looking to add links to the user profile page under the heading "Reports"
 381    then please use this function to ensure that the breadcrumb and navigation block are created properly for all user profile pages.
 382  * process_new_icon() now does not always return a PNG file. When possible, it will try to keep the format of the original file.
 383    Set the new argument $preferpng to true to force PNG. See MDL-46763 and MDL-50041 for details.
 384  
 385  === 2.8 ===
 386  
 387  * Gradebook grade category option "aggregatesubcats" has been removed completely.
 388    This means that the database column is removed, the admin settings are removed and
 389    the properties from the grade_category object have been removed. If any courses were
 390    found to be using this setting, a warning to check the grades will be shown in the
 391    course grader report after upgrading the site. The same warning will be shown on
 392    courses restored from backup that had this setting enabled (see MDL-47503).
 393  * lib/excelllib.class.php has been updated. The class MoodleExcelWorkbook will now only produce excel 2007 files.
 394  * renderers: We now remove the suffix _renderable when looking for a render method for a renderable.
 395    If you have a renderable class named like "blah_renderable" and have a method on a renderer named "render_blah_renderable"
 396    you will need to change the name of your render method to "render_blah" instead, as renderable at the end is no longer accepted.
 397  * New functions get_course_and_cm_from_cmid($cmorid, $modulename) and
 398    get_course_and_cm_from_instance($instanceorid, $modulename) can be used to
 399    more efficiently load these basic data objects at the start of a script.
 400  * New function cm_info::create($cm) can be used when you need a cm_info
 401    object, but have a $cm which might only be a standard database record.
 402  * $CFG->enablegroupmembersonly no longer exists.
 403  * Scheduled tasks have gained support for syntax to introduce variability when a
 404    task will run across installs. When a when hour or minute are defined as 'R'
 405    they will be installed with a random hour/minute value.
 406  * Several classes grade_edit_tree_column_xxx were removed since grades setup page
 407    has been significantly changed. These classes should not be used outside of
 408    gradebook or developers can copy them into their plugins from 2.7 branch.
 409  * Google APIs Client Library (lib/google/) has been upgraded to 1.0.5-beta and
 410    API has changed dramatically without backward compatibility. Any code accessing
 411    it must be amended. It does not apply to lib/googleapi.php. See MDL-47297
 412  * Added an extra parameter to the function get_formatted_help_string() (default null) which is used to specify
 413    additional string parameters.
 414  * User settings node and course node in navigation now support callbacks from admin tools.
 415  * grade_get_grades() optional parameteres $itemtype, $itemmodule, $iteminstance are now required.
 416  
 417  DEPRECATIONS:
 418  * completion_info->get_incomplete_criteria() is deprecated and will be removed in Moodle 3.0.
 419  * grade_category::aggregate_values() is deprecated and will be removed in Moodle 3.0.
 420  * groups_filter_users_by_course_module_visible() is deprecated; replace with
 421    core_availability\info::filter_user_list. Will be removed in Moodle 3.0.
 422  * groups_course_module_visible() is deprecated; replace with $cm->uservisible.
 423  * cm_info property $cm->groupmembersonly is deprecated and always returns 0.
 424    Use core_availability\info::filter_user_list if trying to determine which
 425    other users can see an activity.
 426  * cm_info method $cm->is_user_access_restricted_by_group() is deprecated and
 427    always returns false. Use $cm->uservisible to determine whether the user can
 428    access the activity.
 429  * Constant FEATURE_GROUPMEMBERSONLY (used in module _supports functions) is
 430    deprecated.
 431  * cohort_get_visible_list() is deprecated. There is a better function cohort_get_available_cohorts()
 432    that respects user capabilities to view cohorts.
 433  * enrol_cohort_get_cohorts() and enrol_cohort_search_cohorts() are deprecated since
 434    functionality is removed. Please use cohort_get_available_cohorts()
 435  * enrol_cohort_enrol_all_users() is deprecated; enrol_manual is now responsible for this action
 436  * enrol_cohort_can_view_cohort() is deprecated; replace with cohort_can_view_cohort()
 437  
 438  === 2.6.4 / 2.7.1 ===
 439  
 440  * setnew_password_and_mail() and update_internal_user_password() will trigger
 441    \core\event\user_password_updated. Previously they used to generate
 442    \core\event\user_updated event.
 443  * update_internal_user_password() accepts optional boolean $fasthash for fast
 444    hashing.
 445  * user_update_user() and user_create_user() api's accept optional param
 446    $triggerevent to avoid respective events to be triggred from the api's.
 447  
 448  === 2.7 ===
 449  
 450  * PHPUnit cannot be installed via PEAR any more, please use composer package manager instead.
 451  * $core_renderer->block_move_target() changed to support more verbose move-block-here descriptions.
 452  
 453  Events and Logging:
 454  * Significant changes in Logging API. For upgrading existing events_trigger() and
 455    add_to_log() see http://docs.moodle.org/dev/Migrating_logging_calls_in_plugins
 456    For accessing logs from plugins see http://docs.moodle.org/dev/Migrating_log_access_in_reports
 457  * The validation of the following events is now stricter (see MDL-45445):
 458      - \core\event\blog_entry_created
 459      - \core\event\blog_entry_deleted
 460      - \core\event\blog_entry_updated
 461      - \core\event\cohort_member_added
 462      - \core\event\cohort_member_removed
 463      - \core\event\course_category_deleted
 464      - \core\event\course_completed
 465      - \core\event\course_content_deleted
 466      - \core\event\course_created
 467      - \core\event\course_deleted
 468      - \core\event\course_restored
 469      - \core\event\course_section_updated (see MDL-45229)
 470      - \core\event\email_failed
 471      - \core\event\group_member_added
 472      - \core\event\group_member_removed
 473      - \core\event\note_created
 474      - \core\event\note_deleted
 475      - \core\event\note_updated
 476      - \core\event\role_assigned
 477      - \core\event\role_deleted
 478      - \core\event\role_unassigned
 479      - \core\event\user_graded
 480      - \core\event\user_loggedinas
 481      - \core\event\user_profile_viewed
 482      - \core\event\webservice_token_created
 483  
 484  DEPRECATIONS:
 485  * $module uses in mod/xxx/version.php files is now deprecated. Please use $plugin instead. It will be removed in Moodle 2.10.
 486  * Update init methods in all event classes - "level" property was renamed to "edulevel", the level property is now deprecated.
 487  * Abstract class \core\event\course_module_instances_list_viewed is deprecated now, use \core\event\instances_list_viewed instead.
 488  * Abstract class core\event\content_viewed has been deprecated. Please extend base event or other relevant abstract class.
 489  * mod_book\event\instances_list_viewed has been deprecated. Please use mod_book\event\course_module_instance_list_viewed instead.
 490  * mod_chat\event\instances_list_viewed has been deprecated. Please use mod_chat\event\course_module_instance_list_viewed instead.
 491  * mod_choice\event\instances_list_viewed has been deprecated. Please use mod_choice\event\course_module_instance_list_viewed instead.
 492  * mod_feedback\event\instances_list_viewed has been deprecated. Please use mod_feedback\event\course_module_instance_list_viewed instead.
 493  * mod_page\event\instances_list_viewed has been deprecated. Please use mod_page\event\course_module_instance_list_viewed instead.
 494  * The constants FRONTPAGECOURSELIST, FRONTPAGETOPICONLY & FRONTPAGECOURSELIMIT have been removed.
 495  * Conditional availability API has moved and changed. The condition_info class is
 496    replaced by \core_availability\info_module, and condition_info_section by
 497    \core_availability\info_section. (Code that uses the old classes will generally
 498    still work.)
 499  * coursemodule_visible_for_user() has been deprecated but still works - replaced
 500    by a new static function \core_availability\info_module::is_user_visible()
 501  * cm_info::is_user_access_restricted_by_conditional_access has been deprecated
 502    but still works (it has never done what its name suggests, and is
 503    unnecessary).
 504  * cm_info and section_info property showavailability has been deprecated, but
 505    still works (with the caveat that this information is now per-user).
 506  * cm_info and section_info properties availablefrom and availableuntil have been
 507    deprecated and always return zero (underlying data doesn't have these values).
 508  * section_info property groupingid has been deprecated and always returns zero,
 509    same deal.
 510  * Various cm_info methods have been deprecated in favour of their read-only properties (get_url(), get_content(), get_extra_classes(),
 511    get_on_click(), get_custom_data(), get_after_link, get_after_edit_icons)
 512  * The ajaxenabled function has been deprecated and always returns true. All code should be fully functional in Javascript.
 513  * count_login_failures() has been deprecated, use user_count_login_failures() instead. Refer MDL-42891 for details.
 514  
 515  Conditional availability (activities and sections):
 516  * New conditional availability API in /availability, including new availability
 517    condition plugins in /availability/condition. The new API is very similar with
 518    regard to checking availability, but any code that modifies availability settings
 519    for an activity or section is likely to need substantial changes.
 520  
 521  YUI:
 522    * The lightbox attribute for moodle-core-notification-dialogue has been
 523      deprecated and replaced by the modal attribute. This was actually
 524      changed in Moodle 2.2, but has only been marked as deprecated now. It
 525      will be removed in Moodle 2.9.
 526    * When destroying any type of dialogue based on moodle-core-notification, the relevant content is also removed from
 527      the DOM. Previously it was left orphaned.
 528  
 529  JavaSript:
 530      * The findChildNodes global function has been deprecated. Y.all should
 531        be used instead.
 532      * The callback argument to confirm_action and M.util.show_confirm_dialog has been deprecated. If you need to write a
 533        confirmation which includes a callback, please use moodle-core-notification-confirmation and attach callbacks to the
 534        events provided.
 535  
 536  * New locking api and admin settings to configure the system locking type.
 537  * New "Time spent waiting for the database" performance metric displayed along with the
 538    other MDL_PERF vars; the change affects both the error logs and the vars displayed in
 539    the page footer.
 540  * Changes in the tag API. The component and contextid are now saved when assigning tags to an item. Please see
 541    tag/upgrade.txt for more information.
 542  
 543  === 2.6 ===
 544  
 545  * Use new methods from core_component class instead of get_core_subsystems(), get_plugin_types(),
 546    get_plugin_list(), get_plugin_list_with_class(), get_plugin_directory(), normalize_component(),
 547    get_component_directory() and get_plugin_list_with_file(). The names of the new methods are
 548    exactly the same, the only differences are that core_component::get_plugin_types() now always returns
 549    full paths and core_component::get_plugin_list() does not accept empty parameter any more.
 550  * Use core_text::* instead of textlib:: and also core_collator::* instead of collatorlib::*.
 551  * Use new function moodleform::mock_submit() to simulate form submission in unit tests (backported).
 552  * New $CFG->localcachedir setting useful for cluster nodes. Admins have to update X-Sendfile aliases if used.
 553  * MS SQL Server drivers are now using NVARCHAR(MAX) instead of NTEXT and VARBINARY(MAX) instead of IMAGE,
 554    this change should be fully transparent and it should help significantly with add-on compatibility.
 555  * The string manager classes were renamed. Note that they should not be modified or used directly,
 556    always use get_string_manager() to get instance of the string manager.
 557  * The ability to use an 'insecure' rc4encrypt/rc4decrypt key has been removed.
 558  * Use $CFG->debugdeveloper instead of debugging('', DEBUG_DEVELOPER).
 559  * Use set_debugging(DEBUG_xxx) when changing debugging level for current request.
 560  * Function moveto_module() does not modify $mod argument and instead now returns the new module visibility value.
 561  * Use behat_selectors::get_allowed_text_selectors() and behat_selectors::get_allowed_selectors() instead of
 562    behat_command::$allowedtextselectors and behat_command::$allowedselectors
 563  * Subplugins are supported in admin tools and local plugins.
 564  * file_packer/zip_packer API has been modified so that key functions support a new file_progress interface
 565    to report progress during long operations. Related to this, zip_archive now supports an estimated_count()
 566    function that returns an approximate number of entries in the zip faster than the count() function.
 567  * Class cm_info no longer extends stdClass. All properties are read-only and calculated on first request only.
 568  * Class course_modinfo no longer extends stdClass. All properties are read-only.
 569  * Database fields modinfo and sectioncache in table course are removed. Application cache core/coursemodinfo
 570    is used instead. Course cache is still reset, rebuilt and retrieved using function rebuild_course_cache() and
 571    get_fast_modinfo(). Purging all caches and every core upgrade purges course modinfo cache as well.
 572    If function get_fast_modinfo() is called for multiple courses make sure to include field cacherev in course
 573    object.
 574  * Internal (noreply and support) user support has been added for sending/receiving message.
 575    Use core_user::get_noreply_user() and core_user::get_support_user() to get noreply and support user's respectively.
 576    Real users can be used as noreply/support users by setting $CFG->noreplyuserid and $CFG->supportuserid
 577  * New function readfile_allow_large() in filelib.php for use when very large files may need sending to user.
 578  * Use core_plugin_manager::reset_caches() when changing visibility of plugins.
 579  * Implement new method get_enabled_plugins() method in subplugin info classes.
 580  * Each plugin should include version information in version.php.
 581  * Module and block tables do not contain version column any more, use get_config('xx_yy', 'version') instead.
 582  * $USER->password field is intentionally unset so that session data does not contain password hashes.
 583  * Use core_shutdown_manager::register_function() instead of register_shutdown_function().
 584  * New file packer for .tar.gz files; obtain by calling get_file_packer('application/x-gzip'). Intended initially
 585    for use in backup/restore only, as there are limitations on supported filenames. Also new packer for
 586    backups which supports both compression formats; get_file_packer('application/vnd.moodle.backup').
 587  * New optional parameter to stored_file::get_content_file_handle to open file handle with 'gzopen' instead
 588    of 'fopen' to read gzip-compressed files if required.
 589  * update_internal_user_password() and setnew_password_and_mail() now trigger user_updated event.
 590  * Add thirdpartylibs.xml file to plugins that bundle any 3rd party libraries.
 591  * New class introduced to help auto generate zIndex values for modal dialogues. Class "moodle-has-zindex"
 592    should set on any element which uses a non-default zindex and needs to ensure it doesn't show above a
 593    dialogue.
 594  * $CFG->filelifetime is now used consistently for most file serving operations, the default was lowered
 595    to 6 hours from 24 hours because etags and x-sendfile support should make file serving less expensive.
 596  * Date format locale charset for windows server will come from calendar type and for gregorian it will use
 597    lang file.
 598  * The library to interact with Box.net (class boxclient) is only compatible with their APIv1 which
 599    reaches its end of life on the 14th of Dec. You should migrate your scripts to make usage of the
 600    new class boxnet_client(). Note that the method names and return values have changed.
 601  * Settings pages are now possible for Calendar type plugins. Calendar type plugins that require a settings page to
 602    work properly will need to set their requires version to a number that is equal to or grater than the 2.6.1 release version.
 603  * The admin/tool/generator tool was overhauled to use testing data generators and the previous interface to create
 604    test data was removed (it was not working correctly anyway). If you were using this tool you will probably need to
 605    update your code.
 606  
 607  DEPRECATIONS:
 608  Various previously deprecated functions have now been altered to throw DEBUG_DEVELOPER debugging notices
 609  and will be removed in a future release (target: 2.8), a summary follows:
 610  
 611  Accesslib:
 612      * get_context_instance()                ->  context_xxxx::instance()
 613      * get_context_instance_by_id()          ->  context::instance_by_id($id)
 614      * get_system_context()                  ->  context_system::instance()
 615      * context_moved()                       ->  context::update_moved()
 616      * preload_course_contexts()             ->  context_helper::preload_course()
 617      * context_instance_preload()            ->  context_helper::preload_from_record()
 618      * context_instance_preload_sql()        ->  context_helper::get_preload_record_columns_sql()
 619      * get_contextlevel_name()               ->  context_helper::get_level_name()
 620      * create_contexts()                     ->  context_helper::create_instances()
 621      * cleanup_contexts()                    ->  context_helper::cleanup_instances()
 622      * build_context_path()                  ->  context_helper::build_all_paths()
 623      * print_context_name()                  ->  $context->get_context_name()
 624      * mark_context_dirty()                  ->  $context->mark_dirty()
 625      * delete_context()                      ->  $context->delete_content() or context_helper::delete_instance()
 626      * get_context_url()                     ->  $context->get_url()
 627      * get_course_context()                  ->  $context->get_course_context()
 628      * get_parent_contexts()                 ->  $context->get_parent_context_ids()
 629      * get_parent_contextid()                ->  $context->get_parent_context()
 630      * get_child_contexts()                  ->  $context->get_child_contexts()
 631      * rebuild_contexts()                    ->  $context->reset_paths()
 632      * get_user_courses_bycap()              ->  enrol_get_users_courses()
 633      * get_courseid_from_context()           ->  $context->get_course_context(false)
 634      * get_role_context_caps()               ->  (no replacement)
 635      * load_temp_role()                      ->  (no replacement)
 636      * remove_temp_roles()                   ->  (no replacement)
 637      * get_related_contexts_string()         ->  $context->get_parent_context_ids(true)
 638      * get_recent_enrolments()               ->  (no replacement)
 639  
 640  Enrollment:
 641      * get_course_participants()             -> get_enrolled_users()
 642      * is_course_participant()               -> is_enrolled()
 643  
 644  Output:
 645      * current_theme()                       -> $PAGE->theme->name
 646      * skip_main_destination()               -> $OUTPUT->skip_link_target()
 647      * print_container()                     -> $OUTPUT->container()
 648      * print_container_start()               -> $OUTPUT->container_start()
 649      * print_container_end()                 -> $OUTPUT->container_end()
 650      * print_continue()                      -> $OUTPUT->continue_button()
 651      * print_header()                        -> $PAGE methods
 652      * print_header_simple()                 -> $PAGE methods
 653      * print_side_block()                    -> $OUTPUT->block()
 654      * print_arrow()                         -> $OUTPUT->arrow()
 655      * print_scale_menu_helpbutton()         -> $OUTPUT->help_icon_scale($courseid, $scale)
 656      * print_checkbox()                      -> html_writer::checkbox()
 657  
 658  Navigation:
 659      * print_navigation()                    -> $OUTPUT->navbar()
 660      * build_navigation()                    -> $PAGE->navbar methods
 661      * navmenu()                             -> (no replacement)
 662      * settings_navigation::
 663            get_course_modules()              -> (no replacement)
 664  
 665  Files and repositories:
 666      * stored_file::replace_content_with()   -> stored_file::replace_file_with()
 667      * stored_file::set_filesize()           -> stored_file::replace_file_with()
 668      * stored_file::get_referencelifetime()  -> (no replacement)
 669      * repository::sync_external_file()      -> see repository::sync_reference()
 670      * repository::get_file_by_reference()   -> repository::sync_reference()
 671      * repository::
 672            get_reference_file_lifetime()     -> (no replacement)
 673      * repository::sync_individual_file()    -> (no replacement)
 674      * repository::reset_caches()            -> (no replacement)
 675  
 676  Calendar:
 677      * add_event()                           -> calendar_event::create()
 678      * update_event()                        -> calendar_event->update()
 679      * delete_event()                        -> calendar_event->delete()
 680      * hide_event()                          -> calendar_event->toggle_visibility(false)
 681      * show_event()                          -> calendar_event->toggle_visibility(true)
 682  
 683  Misc:
 684      * filter_text()                         -> format_text(), format_string()...
 685      * httpsrequired()                       -> $PAGE->https_required()
 686      * detect_munged_arguments()             -> clean_param([...], PARAM_FILE)
 687      * mygroupid()                           -> groups_get_all_groups()
 688      * js_minify()                           -> core_minify::js_files()
 689      * css_minify_css()                      -> core_minify::css_files()
 690      * course_modinfo::build_section_cache() -> (no replacement)
 691      * generate_email_supportuser()          -> core_user::get_support_user()
 692  
 693  Sessions:
 694      * session_get_instance()->xxx()         -> \core\session\manager::xxx()
 695      * session_kill_all()                    -> \core\session\manager::kill_all_sessions()
 696      * session_touch()                       -> \core\session\manager::touch_session()
 697      * session_kill()                        -> \core\session\manager::kill_session()
 698      * session_kill_user()                   -> \core\session\manager::kill_user_sessions()
 699      * session_gc()                          -> \core\session\manager::gc()
 700      * session_set_user()                    -> \core\session\manager::set_user()
 701      * session_is_loggedinas()               -> \core\session\manager::is_loggedinas()
 702      * session_get_realuser()                -> \core\session\manager::get_realuser()
 703      * session_loginas()                     -> \core\session\manager::loginas()
 704  
 705  User-agent related functions:
 706      * check_browser_operating_system()      -> core_useragent::check_browser_operating_system()
 707      * check_browser_version()               -> core_useragent::check_browser_version()
 708      * get_device_type()                     -> core_useragent::get_device_type()
 709      * get_device_type_list()                -> core_useragent::get_device_type_list()
 710      * get_selected_theme_for_device_type()  -> core_useragent::get_device_type_theme()
 711      * get_device_cfg_var_name()             -> core_useragent::get_device_type_cfg_var_name()
 712      * set_user_device_type()                -> core_useragent::set_user_device_type()
 713      * get_user_device_type()                -> core_useragent::get_user_device_type()
 714      * get_browser_version_classes()         -> core_useragent::get_browser_version_classes()
 715  
 716  YUI:
 717      * moodle-core-notification has been deprecated with a recommendation of
 718        using its subclasses instead. This is to allow for reduced page
 719        transport costs. Current subclasses include:
 720        * dialogue
 721        * alert
 722        * confirm
 723        * exception
 724        * ajaxexception
 725  
 726  Event triggering and event handlers:
 727      * All existing events and event handlers should be replaced by new
 728        event classes and matching new event observers.
 729      * See http://docs.moodle.org/dev/Event_2 for more information.
 730      * The following events will be entirely removed, though they can still
 731        be captured using handlers, but they should not be used any more.
 732        * groups_members_removed          -> \core\event\group_member_removed
 733        * groups_groupings_groups_removed -> (no replacement)
 734        * groups_groups_deleted           -> \core\event\group_deleted
 735        * groups_groupings_deleted        -> \core\event\grouping_deleted
 736      * edit_module_post_actions() does not trigger events any more.
 737  
 738  === 2.5.1 ===
 739  
 740  * New get_course() function for use when obtaining the course record from database. Will
 741    reuse existing $COURSE or $SITE globals if possible to improve performance.
 742  
 743  === 2.5 ===
 744  
 745  * The database drivers (moodle_database and subclasses) aren't using anymore the ::columns property
 746    for caching database metadata. MUC (databasemeta) is used instead. Any custom DB driver should
 747    apply for that change.
 748  * The cron output has been changed to include time and memory usage (see cron_trace_time_and_memory()),
 749    so any custom utility relying on the old output may require modification.
 750  * Function get_max_file_sizes now returns an option for (for example) "Course limit (500MB)" or
 751    "Site limit (200MB)" when appropriate with the option set to 0. This function no longer returns
 752    an option for 0 bytes. Existing code that was replacing the 0 option in the return
 753    from this function with a more sensible message, can now use the return from this function directly.
 754  * Functions responsible for output in course/lib.php are deprecated, the code is moved to
 755    appropriate renderers: print_section(), print_section_add_menus(), get_print_section_cm_text(),
 756    make_editing_buttons()
 757    See functions' phpdocs in lib/deprecatedlib.php
 758  * Function get_print_section_cm_text() is deprecated, replaced with methods in cm_info
 759  * zip_packer may create empty zip archives, there is a new option to ignore
 760    problematic files when creating archive
 761  * The function delete_course_module was deprecated and has been replaced with
 762    course_delete_module. The reason for this was because the function delete_course_module
 763    only partially deletes data, so wherever it was called extra code was needed to
 764    perform the whole deletion process. The function course_delete_module now takes care
 765    of the whole process.
 766  * curl::setopt() does not accept constant values any more. As it never worked properly,
 767    we decided to make the type check stricter. Now, the keys of the array pass must be a string
 768    corresponding to the curl constant name.
 769  * Function get_users_listing now return list of users except guest and deleted users. Previously
 770    deleted users were excluded by get_users_listing. As guest user is not expected while browsing users,
 771    and not included in get_user function, it will not be returned by get_users_listing.
 772  * The add_* functions in course/dnduploadlib.php have been deprecated. Plugins should be using the
 773    MODNAME_dndupload_register callback instead.
 774  * The signature of the add() method of classes implementing the parentable_part_of_admin_tree
 775    interface (such as admin_category) has been extended. The new parameter allows the caller
 776    to prepend the new node before an existing sibling in the admin tree.
 777  * condition_info:get_condition_user_fields($formatoptions) now accepts the optional
 778    param $formatoptions, that will determine if the field names are processed by
 779    format_string() with the passed options.
 780  * remove all references to $CFG->gdversion, GD PHP extension is now required
 781  * Formslib will now throw a developer warning if a PARAM_ type hasn't been set for elements which
 782    need it. Please set PARAM_RAW explicitly if you do not want any cleaning.
 783  * Functions responsible for managing and accessing course categories are moved to class coursecat
 784    in lib/coursecatlib.php, functions responsible for rendering courses and categories lists are
 785    moved to course/renderer.php. The following global functions are deprecated: make_categories_list(),
 786    category_delete_move(), category_delete_full(), move_category(), course_category_hide(),
 787    course_category_show(), get_course_category(), create_course_category(), get_all_subcategories(),
 788    get_child_categories(), get_categories(), print_my_moodle(), print_remote_course(),
 789    print_remote_host(), print_whole_category_list(), print_category_info(), get_course_category_tree(),
 790    print_courses(), print_course(), get_category_courses_array(), get_category_courses_array_recursively(),
 791    get_courses_wmanagers()
 792    See http://docs.moodle.org/dev/Courses_lists_upgrade_to_2.5
 793  * $core_renderer->block_move_target() changed to support more verbose move-block-here descriptions.
 794  * Additional (optional) param $onlyactive has been added to get_enrolled_users, count_enrolled_users
 795    functions to get information for only active (excluding suspended enrolments) users. Included two
 796    helper functions extract_suspended_users, get_suspended_userids to extract suspended user information.
 797  * The core_plugin_manager class now provides two new helper methods for getting information
 798    about known plugins: get_plugins_of_type() and get_subplugins_of_plugin().
 799  * The get_uninstall_url() method of all subclasses of \core\plugininfo\base class is now expected
 800    to always return moodle_url. Subclasses can use the new method is_uninstall_allowed()
 801    to control the availability of the 'Uninstall' link at the Plugins overview page (previously
 802    they would do it by get_uninstall_url() returning null). By default, URL to a new general plugin
 803    uninstall tool is returned. Unless the plugin type needs extra steps that can't be handled by
 804    plugininfo_xxx::uninstall() method or xmldb_xxx_uninstall() function, this default URL should
 805    satisfy all plugin types.
 806  
 807  Database (DML) layer:
 808  * $DB->sql_empty() is deprecated, you have to use sql parameters with empty values instead,
 809    please note hardcoding of empty strings in SQL queries breaks execution in Oracle database.
 810  * Indexes must not be defined on the same columns as keys, this is now reported as fatal problem.
 811    Please note that internally we create indexes instead of foreign keys.
 812  
 813  YUI changes:
 814  * M.util.help_icon has been deprecated. Code should be updated to use moodle-core-popuphelp
 815    instead. To do so, remove any existing JS calls to M.util.help_icon from your PHP and ensure
 816    that your help link is placed in a span which has the class 'helplink'.
 817  
 818  === 2.4 ===
 819  
 820  * Pagelib: Numerous deprecated functions were removed as classes page_base, page_course
 821    and page_generic_activity.
 822  * use $CFG->googlemapkey3 instead of removed $CFG->googlemapkey and migrate to Google Maps API V3
 823  * Function settings_navigation::add_course_editing_links() is completely removed
 824  * function global_navigation::format_display_course_content() is removed completely (the
 825    functionality is moved to course format class)
 826  * in the function global_navigation::load_generic_course_sections() the argument $courseformat is
 827    removed
 828  * New component and itemid columns in groups_members table - this allows plugin to create protected
 829    group memberships using 'xx_yy_allow_group_member_remove' callback and there is also a new restore
 830    callback 'xx_yy_restore_group_member()'.
 831  * New general role assignment restore plugin callback 'xx_yy_restore_role_assignment()'.
 832  * functions get_generic_section_name(), get_all_sections(), add_mod_to_section(), get_all_mods()
 833    are deprecated. See their phpdocs in lib/deprecatedlib.php on how to replace them
 834  
 835  YUI changes:
 836  * moodle-enrol-notification has been renamed to moodle-core-notification
 837  * YUI2 code must now use 2in3, see http://yuilibrary.com/yui/docs/yui/yui-yui2.html
 838  * M.util.init_select_autosubmit() and M.util.init_url_select() have been deprecated. Code using this should be updated
 839    to use moodle-core-formautosubmit
 840  
 841  Unit testing changes:
 842  * output debugging() is not sent to standard output any more,
 843    use $this->assertDebuggingCalled(), $this->assertDebuggingNotCalled(),
 844    $this->getDebuggingMessages() or $this->assertResetDebugging() instead.
 845  
 846  === 2.3 ===
 847  
 848  Database layer changes:
 849  * objects are not allowed in paramters of DML functions, use explicit casting to strings if necessary
 850  
 851  Note:
 852  * DDL and DML methods which were deprecated in 2.0 have now been removed, they will no longer produce
 853  debug messages and will produce fatal errors
 854  
 855  API changes:
 856  
 857  * send_stored_file() has changed its interface
 858  * deleted several resourcelib_embed_* functions from resourcelib.php
 859  
 860  === 2.2 ===
 861  
 862  removed unused libraries:
 863  * odbc, base32, CodeSniffer, overlib, apd profiling, kses, Smarty, PEAR Console, swfobject, cssshover.htc, md5.js
 864  
 865  API changes:
 866  * new admin/tool plugin type
 867  * new context API - old API is still available
 868  * deleted users do not have context any more
 869  * removed global search
 870  
 871  
 872  === 2.1 ===
 873  
 874  API changes:
 875  * basic suport for restore from 1.9
 876  * new mobile devices API
 877  * new questions API
 878  
 879  
 880  === 2.0 ===
 881  
 882  API changes:
 883  * new DML API - http://docs.moodle.org/dev/DML_functions
 884  * new DDL API - http://docs.moodle.org/dev/DDL_functions
 885  * new file API - http://docs.moodle.org/dev/File_API
 886  * new $PAGE and $OUTPUT API
 887  * new navigation API
 888  * new theme API - http://docs.moodle.org/dev/Theme_changes_in_2.0
 889  * new javascript API - http://docs.moodle.org/dev/JavaScript_usage_guide
 890  * new portfolio API
 891  * new local plugin type
 892  * new translation support - http://lang.moodle.org
 893  * new web service API
 894  * new cohorts API
 895  * new messaging API
 896  * new rating API
 897  * new comment API
 898  * new sessions API
 899  * new enrolment API
 900  * new backup/restore API
 901  * new blocks API
 902  * new filters API
 903  * improved plugin support (aka Frankenstyle)
 904  * new registration and hub API
 905  * new course completion API
 906  * new plagiarism API
 907  * changed blog API
 908  * new text editor API
 909  * new my moodle and profiles API