Documentation & API reference
Constants
Primary tabs
| Name | Location | Description | Direct uses |
Strings |
|---|---|---|---|---|
| CSS_SYSTEM |
drupal/ |
The default group for system CSS files added to the page. | 2 | 1 |
| CSS_DEFAULT |
drupal/ |
The default group for module CSS files added to the page. | 2 | 1 |
| CSS_THEME |
drupal/ |
The default group for theme CSS files added to the page. | 4 | 1 |
| JS_LIBRARY |
drupal/ |
The default group for JavaScript and jQuery libraries added to the page. | 4 | 1 |
| JS_DEFAULT |
drupal/ |
The default group for module JavaScript code added to the page. | 2 | 1 |
| JS_THEME |
drupal/ |
The default group for theme JavaScript code added to the page. | 2 | 1 |
| HTTP_REQUEST_TIMEOUT |
drupal/ |
Error code indicating that the request exceeded the specified timeout. | 2 | 1 |
| DRUPAL_NO_CACHE |
drupal/ |
The block should not get cached. | 15 | 1 |
| DRUPAL_CACHE_CUSTOM |
drupal/ |
The block is handling its own caching in its hook_block_view(). | 2 | 1 |
| DRUPAL_CACHE_PER_ROLE |
drupal/ |
The block or element can change depending on the user's roles. | 8 | 1 |
| DRUPAL_CACHE_PER_USER |
drupal/ |
The block or element can change depending on the user. | 2 | 1 |
| DRUPAL_CACHE_PER_PAGE |
drupal/ |
The block or element can change depending on the page being viewed. | 4 | 1 |
| DRUPAL_CACHE_GLOBAL |
drupal/ |
The block or element is the same for every user and page that it is visible. | 1 | 1 |
| MENU_IS_ROOT |
drupal/ |
Internal menu flag -- menu item is the root of the menu tree. | 1 | |
| MENU_VISIBLE_IN_TREE |
drupal/ |
Internal menu flag -- menu item is visible in the menu tree. | 2 | 1 |
| MENU_VISIBLE_IN_BREADCRUMB |
drupal/ |
Internal menu flag -- menu item is visible in the breadcrumb. | 8 | 1 |
| MENU_LINKS_TO_PARENT |
drupal/ |
Internal menu flag -- menu item links back to its parent. | 3 | 1 |
| MENU_MODIFIED_BY_ADMIN |
drupal/ |
Internal menu flag -- menu item can be modified by administrator. | 1 | |
| MENU_CREATED_BY_ADMIN |
drupal/ |
Internal menu flag -- menu item was created by administrator. | 1 | |
| MENU_IS_LOCAL_TASK |
drupal/ |
Internal menu flag -- menu item is a local task. | 3 | 1 |
| MENU_IS_LOCAL_ACTION |
drupal/ |
Internal menu flag -- menu item is a local action. | 1 | 1 |
| MENU_NORMAL_ITEM |
drupal/ |
Menu type -- A "normal" menu item that's shown in menu and breadcrumbs. | 4 | 1 |
| MENU_CALLBACK |
drupal/ |
Menu type -- A hidden, internal callback, typically used for API calls. | 36 | 1 |
| MENU_SUGGESTED_ITEM |
drupal/ |
Menu type -- A normal menu item, hidden until enabled by an administrator. | 11 | 1 |
| MENU_LOCAL_TASK |
drupal/ |
Menu type -- A task specific to the parent item, usually rendered as a tab. | 25 | 1 |
| MENU_DEFAULT_LOCAL_TASK |
drupal/ |
Menu type -- The "default" local task, which is initially active. | 22 | 1 |
| MENU_LOCAL_ACTION |
drupal/ |
Menu type -- An action specific to the parent, usually rendered as a link. | 16 | 1 |
| MENU_CONTEXT_NONE |
drupal/ |
Internal menu flag: Invisible local task. | 2 | 1 |
| MENU_CONTEXT_PAGE |
drupal/ |
Internal menu flag: Local task should be displayed in page context. | 4 | 1 |
| MENU_CONTEXT_INLINE |
drupal/ |
Internal menu flag: Local task should be displayed inline. | 4 | 1 |
| MENU_FOUND |
drupal/ |
Internal menu status code -- Menu item was found. | 1 | |
| MENU_NOT_FOUND |
drupal/ |
Menu status code -- Not found. | 15 | 1 |
| MENU_ACCESS_DENIED |
drupal/ |
Menu status code -- Access denied. | 18 | 1 |
| MENU_SITE_OFFLINE |
drupal/ |
Internal menu status code -- Menu item inaccessible because site is offline. | 9 | 1 |
| MENU_SITE_ONLINE |
drupal/ |
Internal menu status code -- Everything is working fine. | 6 | 1 |
| MENU_MAX_PARTS |
drupal/ |
The maximum number of path elements for a menu callback | 4 | 1 |
| MENU_MAX_DEPTH |
drupal/ |
The maximum depth of a menu links tree - matches the number of p columns. | 16 | 1 |
| MENU_PREFERRED_LINK |
drupal/ |
Reserved key to identify the most specific menu link for a given path. | 1 | 1 |
| INSTALL_TASK_SKIP |
drupal/ |
Do not run the task during the current installation request. | 3 | 1 |
| INSTALL_TASK_RUN_IF_REACHED |
drupal/ |
Run the task on each installation request until the database is set up. | 2 | 1 |
| INSTALL_TASK_RUN_IF_NOT_COMPLETED |
drupal/ |
Global flag to indicate that a task should be run on each installation request that reaches it, until the database is set up and we are able to record the fact that it already ran. | 3 | 1 |
| VERSION |
drupal/ |
The current system version. | 6 | 1 |
| DRUPAL_CORE_COMPATIBILITY |
drupal/ |
Core API compatibility. | 11 | 1 |
| DRUPAL_MINIMUM_PHP |
drupal/ |
Minimum supported version of PHP. | 7 | 1 |
| DRUPAL_MINIMUM_PHP_MEMORY_LIMIT |
drupal/ |
Minimum recommended value of PHP memory_limit. | 1 | 1 |
| ERROR_REPORTING_HIDE |
drupal/ |
Error reporting level: display no errors. | 1 | 1 |
| ERROR_REPORTING_DISPLAY_SOME |
drupal/ |
Error reporting level: display errors and warnings. | 2 | 1 |
| ERROR_REPORTING_DISPLAY_ALL |
drupal/ |
Error reporting level: display all messages. | 3 | 1 |
| CACHE_PERMANENT |
drupal/ |
Indicates that the item should never be removed unless explicitly selected. | 2 | 1 |
| CACHE_TEMPORARY |
drupal/ |
Indicates that the item should be removed at the next general cache wipe. | 3 | 1 |