Documentation & API reference
Constants
Primary tabs
| Name | Location | Description |
Direct uses |
Strings |
|---|---|---|---|---|
| NODE_ACCESS_ALLOW |
drupal/ |
Denotes that access is allowed for a node. | 3 | |
| NODE_ACCESS_DENY |
drupal/ |
Denotes that access is denied for a node. | 3 | |
| HISTORY_READ_LIMIT |
drupal/ |
Entities changed before this time are always shown as read. | 3 | 1 |
| BLOCK_VISIBILITY_NOTLISTED |
drupal/ |
Shows this block on every page except the listed pages. | 3 | |
| TAXONOMY_HIERARCHY_DISABLED |
drupal/ |
Denotes that no term in the vocabulary has a parent. | 3 | |
| LANGUAGE_NEGOTIATION_URL |
drupal/ |
The language is determined using path prefix or domain. | 3 | |
| MENU_MAX_MENU_NAME_LENGTH_UI |
drupal/ |
Maximum length of menu name as entered by the user. Database length is 32 and we add a menu- prefix. | 3 | |
| FILE_URL_TEST_CDN_2 |
drupal/ |
3 | ||
| INSTALL_TASK_RUN_IF_REACHED |
drupal/ |
Run the task on each installation request that reaches it. | 2 | |
| STREAM_WRAPPERS_LOCAL |
drupal/ |
Stream wrapper bit flag -- refers to a local file system location. | 2 | |
| STREAM_WRAPPERS_LOCAL_HIDDEN |
drupal/ |
Stream wrapper type flag -- hidden, readable and writeable using local files. | 2 | 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 | |
| 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_SITE_DEFAULT |
drupal/ |
The language state used when referring to the site's default language. | 2 | |
| SCHEMA_INSTALLED |
drupal/ |
Indicates that a module has been installed. | 2 | |
| CONFIG_IMPORT_LOCK |
drupal/ |
Config import lock name used to prevent concurrent synchronizations. | 2 | |
| CSS_SYSTEM |
drupal/ |
The default group for system CSS files added to the page. | 2 | |
| CSS_DEFAULT |
drupal/ |
The default group for module CSS files added to the page. | 2 | |
| CSS_THEME |
drupal/ |
The default group for theme CSS files added to the page. | 2 | |
| JS_THEME |
drupal/ |
The default group for theme JavaScript code added to the page. | 2 | |
| HTTP_REQUEST_TIMEOUT |
drupal/ |
Error code indicating that the request exceeded the specified timeout. | 2 | |
| DRUPAL_CACHE_CUSTOM |
drupal/ |
The block is handling its own caching in its hook_block_view(). | 2 | |
| DRUPAL_CACHE_PER_USER |
drupal/ |
The block or element can change depending on the user. | 2 | |
| MENU_CONTEXT_NONE |
drupal/ |
Internal menu flag: Invisible local task. | 2 | |
| OPENID_DH_DEFAULT_MOD |
drupal/ |
Diffie-Hellman Key Exchange Default Value. | 2 | 1 |
| OPENID_DH_DEFAULT_GEN |
drupal/ |
Diffie-Hellman generator; used for Diffie-Hellman key exchange computations. | 2 | |
| OPENID_NS_AX |
drupal/ |
OpenID Attribute Exchange extension. | 2 | |
| DRUPAL_MAXIMUM_TEMP_FILE_AGE |
drupal/ |
Maximum age of temporary files in seconds. | 2 | |
| PREG_CLASS_CJK |
drupal/ |
Matches CJK (Chinese, Japanese, Korean) letter-like characters. | 2 | 1 |
| BLOCK_CUSTOM_FIXED |
drupal/ |
Users cannot control whether or not they see this block. | 2 | |
| BLOCK_CUSTOM_ENABLED |
drupal/ |
Shows this block by default, but lets individual users hide it. | 2 | |
| BLOCK_VISIBILITY_LISTED |
drupal/ |
Shows this block on only the listed pages. | 2 | |
| BLOCK_VISIBILITY_PHP |
drupal/ |
Shows this block if the associated PHP code returns TRUE. | 2 | |
| EMAIL_MAX_LENGTH |
drupal/ |
Maximum length of user e-mail text field. | 2 | 1 |
| LOCALE_TRANSLATION_SOURCE_COMPARE_LT |
drupal/ |
Comparison result of source files timestamps. | 2 | |
| LANGUAGE_NEGOTIATION_INTERFACE |
drupal/ |
The language is determined using the current interface language. | 2 | |
| COMMENT_ANONYMOUS_MAYNOT_CONTACT |
drupal/ |
Anonymous posters cannot enter their contact information. | 2 | |
| COMMENT_ANONYMOUS_MAY_CONTACT |
drupal/ |
Anonymous posters may leave their contact information. | 2 | |
| FILE_URL_TEST_CDN_1 |
drupal/ |
2 | ||
| VIEWS_HANDLER_RENDER_TEXT_PHASE_EMPTY |
drupal/ |
Indicator of the render_text() method for rendering the empty text. | 2 | 1 |
| REQUIRED_D7_SCHEMA_VERSION |
drupal/ |
Minimum schema version of Drupal 7 required for upgrade to Drupal 8. | 1 | |
| REQUIREMENT_INFO |
drupal/ |
Requirement severity -- Informational message only. | 1 | |
| REQUIREMENT_OK |
drupal/ |
Requirement severity -- Requirement successfully met. | 1 | |
| FILE_NOT_EXIST |
drupal/ |
File permission check -- File does not exist. | 1 | |
| STREAM_WRAPPERS_READ |
drupal/ |
Stream wrapper bit flag -- wrapper is readable (almost always true). | 1 | |
| STREAM_WRAPPERS_WRITE |
drupal/ |
Stream wrapper bit flag -- wrapper is writeable. | 1 |