# core (subsystem) Upgrade notes

## 4.5dev

### Removed

- The previously deprecated function `search_generate_text_SQL` has been removed and can no longer be used.

  For more information see [MDL-48940](https://tracker.moodle.org/browse/MDL-48940)
- The previously deprecated function `core_text::reset_caches()` has been removed and can no longer be used.

  For more information see [MDL-71748](https://tracker.moodle.org/browse/MDL-71748)
- The following previously deprecated methods have been removed and can no longer be used:
    - `renderer_base::should_display_main_logo`

  For more information see [MDL-73165](https://tracker.moodle.org/browse/MDL-73165)
- Final deprecation of print_error(). Use moodle_exception instead.

  For more information see [MDL-74484](https://tracker.moodle.org/browse/MDL-74484)
- Final deprecation of \core\task\manager::ensure_adhoc_task_qos()

  For more information see [MDL-74843](https://tracker.moodle.org/browse/MDL-74843)
- Remove deprecation layer for YUI Events. The deprecation layer was introduced with MDL-70990 and MDL-72291.

  For more information see [MDL-77167](https://tracker.moodle.org/browse/MDL-77167)

### Added

- The following classes have been renamed and now support autoloading.
  Existing classes are currently unaffected.
  | Old class name | New class name |
  | --- | --- |
  | `\core_component` | `\core\component` |

  For more information see [MDL-66903](https://tracker.moodle.org/browse/MDL-66903)
- Added the ability for unit tests to autoload classes in the `\[component]\tests\`
  namespace from the `[path/to/component]/tests/classes` directory.

  For more information see [MDL-66903](https://tracker.moodle.org/browse/MDL-66903)
- Added a helper to load fixtures from a components `tests/fixtures/` folder:
  ```php
  advanced_testcase::load_fixture(string $component, string $fixture): void;
  ```

  For more information see [MDL-66903](https://tracker.moodle.org/browse/MDL-66903)
- Added stored progress bars

  For more information see [MDL-70854](https://tracker.moodle.org/browse/MDL-70854)
- New DML constant `SQL_INT_MAX` to define the size of a large integer with cross database platform support

  For more information see [MDL-81282](https://tracker.moodle.org/browse/MDL-81282)
- The function update_display_mode will update the eye icon (enabled/disabled) in the availability. The $pluginname is represented to the plugin need to update. The $displaymode is represented to the eye icon. Whether it enabled or disabled.

  For more information see [MDL-81533](https://tracker.moodle.org/browse/MDL-81533)
- Added an `exception` L2 Namespace to APIs

  For more information see [MDL-81903](https://tracker.moodle.org/browse/MDL-81903)
- Added a mechanism to support autoloading of legacy class files.
  This will help to reduce the number of require_once calls in the codebase, and move away from the use of monolithic libraries.

  For more information see [MDL-81919](https://tracker.moodle.org/browse/MDL-81919)
- The following exceptions are now also available in the `\core\exception` namespace:
    - `\coding_exception`
    - `\file_serving_exception`
    - `\invalid_dataroot_permissions`
    - `\invalid_parameter_exception`
    - `\invalid_response_exception`
    - `\invalid_state_exception`
    - `\moodle_exception`
    - `\require_login_exception`
    - `\require_login_session_timeout_exception`
    - `\required_capability_exception`
    - `\webservice_parameter_exception`

  For more information see [MDL-81919](https://tracker.moodle.org/browse/MDL-81919)
- The following classes have been moved into the `\core` namespace and now support autoloading:
  - `emoticon_manager`
  - `lang_string`

  For more information see [MDL-81920](https://tracker.moodle.org/browse/MDL-81920)
- The following classes have been renamed and now support autoloading. Existing classes are currently unaffected.
  | Old class name | New class name |
  | --- | --- |
  | `\moodle_url` | `\core\url` |
  | `\progress_trace` | `\core\output\progress_trace` |
  | `\combined_progress_trace` | `\core\output\progress_trace\combined_progress_trace` |
  | `\error_log_progress_trace` | `\core\output\progress_trace\error_log_progress_trace` |
  | `\html_list_progress_trace` | `\core\output\progress_trace\html_list_progress_trace` |
  | `\html_progress_trace` | `\core\output\progress_trace\html_progress_trace` |
  | `\null_progress_trace` | `\core\output\progress_trace\null_progress_trace` |
  | `\progress_trace_buffer` | `\core\output\progress_trace\progress_trace_buffer` |
  | `\text_progress_trace` | `\core\output\progress_trace\text_progress_trace` |

  For more information see [MDL-81960](https://tracker.moodle.org/browse/MDL-81960)
- The following classes are now also available in the following new locations. They will continue to work in their old locations:
  | Old classname | New classname |
  | --- | --- |
  | `\action_link` | `\core\output\action_link` |
  | `\action_menu_filler` | `\core\output\action_menu\filler` |
  | `\action_menu_link_primary` | `\core\output\action_menu\link_primary` |
  | `\action_menu_link_secondary` | `\core\output\action_menu\link_secondary` |
  | `\action_menu_link` | `\core\output\action_menu\link` |
  | `\action_menu` | `\core\output\action_menu` |
  | `\block_contents` | `\core_block\output\block_contents` |
  | `\block_move_target` | `\core_block\output\block_move_target` |
  | `\component_action` | `\core\output\actions\component_action` |
  | `\confirm_action` | `\core\output\actions\confirm_action` |
  | `\context_header` | `\core\output\context_header` |
  | `\core\output\local\action_menu\subpanel` | `\core\output\action_menu\subpanel` |
  | `\core_renderer_ajax` | `\core\output\core_renderer_ajax` |
  | `\core_renderer_cli` | `\core\output\core_renderer_cli` |
  | `\core_renderer_maintenance` | `\core\output\core_renderer_maintenance` |
  | `\core_renderer` | `\core\output\core_renderer` |
  | `\custom_menu_item` | `\core\output\custom_menu_item` |
  | `\custom_menu` | `\core\output\custom_menu` |
  | `\file_picker` | `\core\output\file_picker` |
  | `\flexible_table` | `\core_table\flexible_table` |
  | `\fragment_requirements_manager` | `\core\output\requirements\fragment_requirements_manager` |
  | `\help_icon` | `\core\output\help_icon` |
  | `\html_table_cell` | `\core_table\output\html_table_cell` |
  | `\html_table_row` | `\core_table\output\html_table_row` |
  | `\html_table` | `\core_table\output\html_table` |
  | `\html_writer` | `\core\output\html_writer` |
  | `\image_icon` | `\core\output\image_icon` |
  | `\initials_bar` | `\core\output\initials_bar` |
  | `\js_writer` | `\core\output\js_writer` |
  | `\page_requirements_manager` | `\core\output\requirements\page_requirements_manager` |
  | `\paging_bar` | `\core\output\paging_bar` |
  | `\pix_emoticon` | `\core\output\pix_emoticon` |
  | `\pix_icon_font` | `\core\output\pix_icon_font` |
  | `\pix_icon_fontawesome` | `\core\output\pix_icon_fontawesome` |
  | `\pix_icon` | `\core\output\pix_icon` |
  | `\plugin_renderer_base` | `\core\output\plugin_renderer_base` |
  | `\popup_action` | `\core\output\actions\popup_action` |
  | `\preferences_group` | `\core\output\preferences_group` |
  | `\preferences_groups` | `\core\output\preferences_groups` |
  | `\progress_bar` | `\core\output\progress_bar` |
  | `\renderable` | `\core\output\renderable` |
  | `\renderer_base` | `\core\output\renderer_base` |
  | `\renderer_factory_base` | `\core\output\renderer_factory\renderer_factory_base` |
  | `\renderer_factory` | `\core\output\renderer_factory\renderer_factory_interface` |
  | `\single_button` | `\core\output\single_button` |
  | `\single_select` | `\core\output\single_select` |
  | `\standard_renderer_factory` | `\core\output\renderer_factory\standard_renderer_factory` |
  | `\table_dataformat_export_format` | `\core_table\dataformat_export_format` |
  | `\table_default_export_format_parent` | `\core_table\base_export_format` |
  | `\table_sql` | `\core_table\sql_table` |
  | `\tabobject` | `\core\output\tabobject` |
  | `\tabtree` | `\core\output\tabtree` |
  | `\templatable` | `\core\output\templatable` |
  | `\theme_config` | `\core\output\theme_config` |
  | `\theme_overridden_renderer_factory` | `\core\output\renderer_factory\theme_overridden_renderer_factory` |
  | `\url_select` | `\core\output\url_select` |
  | `\user_picture` | `\core\output\user_picture` |
  | `\xhtml_container_stack` | `\core\output\xhtml_container_stack` |
  | `\YUI_config` | `\core\output\requirements\yui` |

  For more information see [MDL-82183](https://tracker.moodle.org/browse/MDL-82183)

### Changed

- The class autoloader has been moved to an earlier point in the Moodle bootstrap.
  Autoloaded classes are now available to scripts using the `ABORT_AFTER_CONFIG` constant.

  For more information see [MDL-80275](https://tracker.moodle.org/browse/MDL-80275)
- The `\core\dataformat::get_format_instance` method is now public, and can be used to retrieve a writer instance for a given dataformat

  For more information see [MDL-81781](https://tracker.moodle.org/browse/MDL-81781)
- The `get_home_page()` method can now return new constant `HOMEPAGE_URL`, applicable when a third-party hook has extended the default homepage options for the site
  A new method, `get_default_home_page_url()` has been added which will return the correct URL when this constant is returned

  For more information see [MDL-82066](https://tracker.moodle.org/browse/MDL-82066)

### Fixed

- All the setup and tear down methods of `PHPUnit` now are required to, always, call to their parent counterparts. This is a good practice to avoid future problems, especially when updating to PHPUnit >= 10.
  This includes the following methods:
    - `setUp()`
    - `tearDown()`
    - `setUpBeforeClass()`
    - `tearDownAfterClass()`

  For more information see [MDL-81523](https://tracker.moodle.org/browse/MDL-81523)
- Use server timezone when constructing `\DateTimeImmutable` for the system `\core\clock` implementation.

  For more information see [MDL-81894](https://tracker.moodle.org/browse/MDL-81894)

### Deprecated

- The following methods have been deprecated, existing usage should switch to secure `\core\encryption` library:
  - `rc4encrypt`
  - `rc4decrypt`
  - `endecrypt`

  For more information see [MDL-81940](https://tracker.moodle.org/browse/MDL-81940)
- The following method has been deprecated and should not be used any longer: `print_grade_menu`.

  For more information see [MDL-82157](https://tracker.moodle.org/browse/MDL-82157)
- The following files and their contents have been deprecated:
  - `lib/soaplib.php`
  - `lib/tokeniserlib.php`

  For more information see [MDL-82191](https://tracker.moodle.org/browse/MDL-82191)
- The following methods have been formally deprecated:
  - `get_core_subsystems`
  - `get_plugin_types`
  - `get_plugin_list`
  - `get_plugin_list_with_class`
  - `get_plugin_directory`
  - `normalize_component`
  - `get_component_directory`
  - `get_context_instance`
  Note: These methods have been deprecated for a long time, but previously did not emit any deprecation notice.

  For more information see [MDL-82287](https://tracker.moodle.org/browse/MDL-82287)
- The following methods have been finally deprecated and will now throw an exception if called:
  - `get_context_instance`
  - `can_use_rotated_text`
  - `get_system_context`
  - `print_arrow`

  For more information see [MDL-82287](https://tracker.moodle.org/browse/MDL-82287)