| system_admin_compact_mode | Determines whether the current user is in compact mode. |
| system_authorized_batch_process | Use authorize.php to run batch_process(). |
| system_authorized_batch_processing_url | Returns the URL for the authorize.php script when it is processing a batch. |
| system_authorized_get_url | Return the URL for the authorize.php script. |
| system_authorized_init | Setup a given callback to run via authorize.php with elevated privileges. |
| system_authorized_run | Setup and invoke an operation using authorize.php. |
| system_block_view_system_main_block_alter | Implements hook_block_view_BASE_BLOCK_ID_alter(). |
| system_check_directory | Checks the existence of the directory specified in $form_element. |
| system_cron | Implements hook_cron(). |
| system_default_region | Gets the name of the default region for a given theme. |
| system_entity_type_build | Implements hook_entity_type_build(). |
| system_filetransfer_info | Implements hook_filetransfer_info(). |
| system_form_alter | Implements hook_form_alter(). |
| system_form_user_form_alter | Implements hook_form_FORM_ID_alter() for \Drupal\user\AccountForm. |
| system_form_user_register_form_alter | Implements hook_form_FORM_ID_alter() for \Drupal\user\RegisterForm. |
| system_get_info | Returns an array of information about enabled modules or themes. |
| system_get_module_admin_tasks | Generate a list of tasks offered by a specified module. |
| system_help | Implements hook_help(). |
| system_hook_info | Implements hook_hook_info(). |
| system_js_settings_alter | Implements hook_js_settings_alter(). |
| system_js_settings_build | Implements hook_js_settings_build(). |
| system_mail | Implements hook_mail(). |
| system_page_attachments | Implements hook_page_attachments(). |
| system_path_delete | Implements hook_path_delete(). |
| system_path_insert | Implements hook_path_insert(). |
| system_path_update | Implements hook_path_update(). |
| system_preprocess_block | Implements hook_preprocess_HOOK() for block templates. |
| system_query_entity_reference_alter | Implements hook_query_TAG_alter() for entity reference selection handlers. |
| system_rebuild_module_data | Rebuild, save, and return data about all currently available modules. |
| system_region_list | Get a list of available regions from a specified theme. |
| system_retrieve_file | Attempts to get a file using Guzzle HTTP client and to store it locally. |
| system_sort_modules_by_info_name | Array sorting callback; sorts modules by their name. |
| system_sort_themes | Sorts themes by their names, with the default theme listed first. |
| system_system_info_alter | Implements hook_system_info_alter(). |
| system_theme | Implements hook_theme(). |
| system_theme_suggestions_field | Implements hook_theme_suggestions_HOOK(). |
| system_theme_suggestions_html | Implements hook_theme_suggestions_HOOK(). |
| system_theme_suggestions_maintenance_page | Implements hook_theme_suggestions_HOOK(). |
| system_theme_suggestions_page | Implements hook_theme_suggestions_HOOK(). |
| system_theme_suggestions_region | Implements hook_theme_suggestions_HOOK(). |
| system_time_zones | Generate an array of time zones and their local time&date. |
| system_updater_info | Implements hook_updater_info(). |
| system_user_login | Implements hook_user_login(). |
| system_user_presave | Implements hook_ENTITY_TYPE_presave() for user entities. |
| system_user_timezone | Add the time zone field to the user edit and register forms. |
| template_preprocess_entity_add_list | Prepares variables for the list of available bundles. |
| _system_rebuild_module_data | Helper function to scan and collect module .info.yml data. |
| _system_rebuild_module_data_ensure_required | Ensures that dependencies of required modules are also required. |
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