Documentation & API reference
Constants
Primary tabs
| Name |
Location |
Description | Direct uses | Strings |
|---|---|---|---|---|
| DRUPAL_ROOT |
drupal/ |
Defines the root directory of the Drupal installation. | 162 | 9 |
| MAINTENANCE_MODE |
drupal/ |
Global flag to identify update.php and authorize.php runs. | 10 | 20 |
| DRUPAL_ROOT |
drupal/ |
Root directory of Drupal installation. | 162 | 9 |
| REQUEST_TIME |
drupal/ |
Time of the current request in seconds elapsed since the Unix Epoch. | 103 | 1 |
| CHECK_PLAIN |
drupal/ |
Flag used to indicate that text is not sanitized, so run check_plain(). | 1 | 1 |
| PASS_THROUGH |
drupal/ |
Flag used to indicate that text has already been sanitized. | 35 | 1 |
| REGISTRY_RESET_LOOKUP_CACHE |
drupal/ |
Signals that the registry lookup cache should be reset. | 2 | 1 |
| REGISTRY_WRITE_LOOKUP_CACHE |
drupal/ |
Signals that the registry lookup cache should be written to storage. | 2 | 1 |
| DRUPAL_PHP_FUNCTION_PATTERN |
drupal/ |
Regular expression to match PHP function names. | 7 | 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 |
| WATCHDOG_EMERGENCY |
drupal/ |
Log message severity -- Emergency: system is unusable. | 2 | 1 |
| WATCHDOG_ALERT |
drupal/ |
Log message severity -- Alert: action must be taken immediately. | 2 | 1 |
| WATCHDOG_CRITICAL |
drupal/ |
Log message severity -- Critical conditions. | 2 | 1 |
| WATCHDOG_ERROR |
drupal/ |
Log message severity -- Error conditions. | 27 | 1 |
| WATCHDOG_WARNING |
drupal/ |
Log message severity -- Warning conditions. | 21 | 1 |
| WATCHDOG_NOTICE |
drupal/ |
Log message severity -- Normal but significant conditions. | 30 | 1 |
| WATCHDOG_INFO |
drupal/ |
Log message severity -- Informational messages. | 9 | 1 |
| WATCHDOG_DEBUG |
drupal/ |
Log message severity -- Debug-level messages. | 3 | 1 |
| DRUPAL_BOOTSTRAP_CONFIGURATION |
drupal/ |
First bootstrap phase: initialize configuration. | 5 | 1 |
| DRUPAL_BOOTSTRAP_PAGE_CACHE |
drupal/ |
Second bootstrap phase: try to serve a cached page. | 1 | 1 |
| DRUPAL_BOOTSTRAP_DATABASE |
drupal/ |
Third bootstrap phase: initialize database layer. | 3 | 1 |
| DRUPAL_BOOTSTRAP_VARIABLES |
drupal/ |
Fourth bootstrap phase: initialize the variable system. | 5 | 1 |
| DRUPAL_BOOTSTRAP_SESSION |
drupal/ |
Fifth bootstrap phase: initialize session handling. | 4 | 1 |
| DRUPAL_BOOTSTRAP_PAGE_HEADER |
drupal/ |
Sixth bootstrap phase: set up the page header. | 1 | 1 |
| DRUPAL_BOOTSTRAP_LANGUAGE |
drupal/ |
Seventh bootstrap phase: find out language of the page. | 2 | 1 |
| DRUPAL_BOOTSTRAP_FULL |
drupal/ |
Final bootstrap phase: Drupal is fully loaded; validate and fix input data. | 14 | 1 |
| DRUPAL_ANONYMOUS_RID |
drupal/ |
Role ID for anonymous users; should match what's in the "role" table. | 33 | 1 |
| DRUPAL_AUTHENTICATED_RID |
drupal/ |
Role ID for authenticated users; should match what's in the "role" table. | 16 | 1 |
| DRUPAL_KILOBYTE |
drupal/ |
The number of bytes in a kilobyte. | 3 | 1 |
| LANGUAGE_NONE |
drupal/ |
The language code used when no language is explicitly assigned. | 156 | 1 |
| LANGUAGE_TYPE_CONTENT |
drupal/ |
The type of language used to define the content language. | 7 | 1 |
| LANGUAGE_TYPE_INTERFACE |
drupal/ |
The type of language used to select the user interface. | 14 | 1 |
| LANGUAGE_TYPE_URL |
drupal/ |
The type of language used for URLs. | 4 | 1 |
| LANGUAGE_LTR |
drupal/ |
Language written left to right. Possible value of $language->direction. | 9 | 1 |
| LANGUAGE_RTL |
drupal/ |
Language written right to left. Possible value of $language->direction. | 6 | 1 |
| SAVED_NEW |
drupal/ |
Return status for saving which involved creating a new item. | 12 | 1 |
| SAVED_UPDATED |
drupal/ |
Return status for saving which involved an update to an existing item. | 12 | 1 |
| SAVED_DELETED |
drupal/ |
Return status for saving which deleted an existing item. | 2 | 1 |
| 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 |