Documentation & API reference
Constants
Primary tabs
| Name |
Location |
Description | Direct uses | Strings |
|---|---|---|---|---|
| DRUPAL_ROOT |
drupal/ |
Defines the root directory of the Drupal installation. | 136 | 7 |
| MAINTENANCE_MODE |
drupal/ |
Global flag to identify update.php and authorize.php runs. | 7 | 17 |
| VERSION |
drupal/ |
The current system version. | 32 | |
| DRUPAL_CORE_COMPATIBILITY |
drupal/ |
Core API compatibility. | 11 | |
| DRUPAL_MINIMUM_PHP |
drupal/ |
Minimum supported version of PHP. | 4 | |
| DRUPAL_MINIMUM_PHP_MEMORY_LIMIT |
drupal/ |
Minimum recommended value of PHP memory_limit. | ||
| ERROR_REPORTING_HIDE |
drupal/ |
Error reporting level: display no errors. | ||
| ERROR_REPORTING_DISPLAY_SOME |
drupal/ |
Error reporting level: display errors and warnings. | 1 | |
| ERROR_REPORTING_DISPLAY_ALL |
drupal/ |
Error reporting level: display all messages. | 1 | |
| ERROR_REPORTING_DISPLAY_VERBOSE |
drupal/ |
Error reporting level: display all messages, plus backtrace information. | 2 | |
| WATCHDOG_EMERGENCY |
drupal/ |
Log message severity -- Emergency: system is unusable. | 2 | |
| WATCHDOG_ALERT |
drupal/ |
Log message severity -- Alert: action must be taken immediately. | 2 | |
| WATCHDOG_CRITICAL |
drupal/ |
Log message severity -- Critical conditions. | 2 | |
| WATCHDOG_ERROR |
drupal/ |
Log message severity -- Error conditions. | 26 | |
| WATCHDOG_WARNING |
drupal/ |
Log message severity -- Warning conditions. | 19 | |
| WATCHDOG_NOTICE |
drupal/ |
Log message severity -- Normal but significant conditions. | 28 | |
| WATCHDOG_INFO |
drupal/ |
Log message severity -- Informational messages. | 9 | |
| WATCHDOG_DEBUG |
drupal/ |
Log message severity -- Debug-level messages. | 3 | |
| DRUPAL_BOOTSTRAP_CONFIGURATION |
drupal/ |
First bootstrap phase: initialize configuration. | 6 | |
| DRUPAL_BOOTSTRAP_KERNEL |
drupal/ |
Second bootstrap phase, initalize a kernel. | 1 | |
| DRUPAL_BOOTSTRAP_PAGE_CACHE |
drupal/ |
Third bootstrap phase: try to serve a cached page. | 1 | |
| DRUPAL_BOOTSTRAP_DATABASE |
drupal/ |
Fourth bootstrap phase: initialize database layer. | 3 | |
| DRUPAL_BOOTSTRAP_VARIABLES |
drupal/ |
Fifth bootstrap phase: initialize the variable system. | 5 | |
| DRUPAL_BOOTSTRAP_SESSION |
drupal/ |
Sixth bootstrap phase: initialize session handling. | 4 | |
| DRUPAL_BOOTSTRAP_PAGE_HEADER |
drupal/ |
Seventh bootstrap phase: set up the page header. | 1 | |
| DRUPAL_BOOTSTRAP_CODE |
drupal/ |
Eighth bootstrap phase: load code for subsystems and modules. | 5 | |
| DRUPAL_BOOTSTRAP_FULL |
drupal/ |
Final bootstrap phase: initialize language, path, theme, and modules. | 7 | |
| DRUPAL_ANONYMOUS_RID |
drupal/ |
Role ID for anonymous users; should match what's in the "role" table. | 40 | |
| DRUPAL_AUTHENTICATED_RID |
drupal/ |
Role ID for authenticated users; should match what's in the "role" table. | 25 | |
| DRUPAL_KILOBYTE |
drupal/ |
The number of bytes in a kilobyte. | 3 | |
| LANGUAGE_SYSTEM |
drupal/ |
Special system language code (only applicable to UI language). | 4 | |
| LANGUAGE_NOT_SPECIFIED |
drupal/ |
The language code used when no language is explicitly assigned (yet). | 187 | |
| LANGUAGE_NOT_APPLICABLE |
drupal/ |
The language code used when the marked object has no linguistic content. | 2 | |
| LANGUAGE_MULTIPLE |
drupal/ |
The language code used when multiple languages could be applied. | 2 | |
| LANGUAGE_DEFAULT |
drupal/ |
Language code referring to the default language of data, e.g. of an entity. | 6 | |
| LANGUAGE_CONFIGURABLE |
drupal/ |
The language state when referring to configurable languages. | 7 | |
| LANGUAGE_LOCKED |
drupal/ |
The language state when referring to locked languages. | 7 | |
| LANGUAGE_ALL |
drupal/ |
The language state used when referring to all languages. | 22 | |
| LANGUAGE_SITE_DEFAULT |
drupal/ |
The language state used when referring to the site's default language. | 2 | |
| LANGUAGE_TYPE_CONTENT |
drupal/ |
The type of language used to define the content language. | 12 | |
| LANGUAGE_TYPE_INTERFACE |
drupal/ |
The type of language used to select the user interface. | 55 | |
| LANGUAGE_TYPE_URL |
drupal/ |
The type of language used for URLs. | 4 | |
| LANGUAGE_LTR |
drupal/ |
Language written left to right. Possible value of $language->direction. | 3 | |
| LANGUAGE_RTL |
drupal/ |
Language written right to left. Possible value of $language->direction. | 5 | |
| UNICODE_ERROR |
drupal/ |
Indicates an error during check for PHP unicode support. | 1 | |
| UNICODE_SINGLEBYTE |
drupal/ |
Indicates that standard PHP (emulated) unicode support is being used. | 3 | |
| UNICODE_MULTIBYTE |
drupal/ |
Indicates that full unicode support with the PHP mbstring extension is being used. | 7 | |
| REQUEST_TIME |
drupal/ |
Time of the current request in seconds elapsed since the Unix Epoch. | 130 | 1 |
| CHECK_PLAIN |
drupal/ |
Flag for drupal_set_title(); text is not sanitized, so run check_plain(). | 1 | |
| PASS_THROUGH |
drupal/ |
Flag for drupal_set_title(); text has already been sanitized. | 36 |