| AGGREGATOR_CLEAR_NEVER | core/modules/aggregator/aggregator.module | Denotes that a feed's items should never expire. |
| ARCHIVE_TAR_ATT_SEPARATOR | core/lib/Drupal/Component/Archiver/ArchiveTar.php | |
| ARCHIVE_TAR_END_BLOCK | core/lib/Drupal/Component/Archiver/ArchiveTar.php | |
| BLOCK_CUSTOM_DISABLED | core/modules/block/block.module | Hides this block by default but lets individual users show it. |
| BLOCK_CUSTOM_ENABLED | core/modules/block/block.module | Shows this block by default, but lets individual users hide it. |
| BLOCK_CUSTOM_FIXED | core/modules/block/block.module | Users cannot control whether or not they see this block. |
| BLOCK_REGION_NONE | core/modules/block/block.module | Denotes that a block is not enabled in any region and should not be shown. |
| BLOCK_VISIBILITY_LISTED | core/modules/block/block.module | Shows this block on only the listed pages. |
| BLOCK_VISIBILITY_NOTLISTED | core/modules/block/block.module | Shows this block on every page except the listed pages. |
| BLOCK_VISIBILITY_PHP | core/modules/block/block.module | Shows this block if the associated PHP code returns TRUE. |
| CACHE_PERMANENT | core/includes/bootstrap.inc | Indicates that the item should never be removed unless explicitly selected. |
| CACHE_TEMPORARY | core/includes/bootstrap.inc | Indicates that the item should be removed at the next general cache wipe. |
| CHECK_PLAIN | core/includes/bootstrap.inc | Flag for drupal_set_title(); text is not sanitized, so run check_plain(). |
| COMMENT_ANONYMOUS_MAYNOT_CONTACT | core/modules/comment/comment.module | Anonymous posters cannot enter their contact information. |
| COMMENT_ANONYMOUS_MAY_CONTACT | core/modules/comment/comment.module | Anonymous posters may leave their contact information. |
| COMMENT_ANONYMOUS_MUST_CONTACT | core/modules/comment/comment.module | Anonymous posters are required to leave their contact information. |
| COMMENT_FORM_BELOW | core/modules/comment/comment.module | Comment form should be shown below post or list of comments. |
| COMMENT_FORM_SEPARATE_PAGE | core/modules/comment/comment.module | Comment form should be displayed on a separate page. |
| COMMENT_MODE_FLAT | core/modules/comment/comment.module | Comments are displayed in a flat list - expanded. |
| COMMENT_MODE_THREADED | core/modules/comment/comment.module | Comments are displayed as a threaded list - expanded. |
| COMMENT_NODE_CLOSED | core/modules/comment/comment.module | Comments for this node are closed. |
| COMMENT_NODE_HIDDEN | core/modules/comment/comment.module | Comments for this node are hidden. |
| COMMENT_NODE_OPEN | core/modules/comment/comment.module | Comments for this node are open. |
| COMMENT_NOT_PUBLISHED | core/modules/comment/comment.module | Comment is awaiting approval. |
| COMMENT_PUBLISHED | core/modules/comment/comment.module | Comment is published. |
| CSS_DEFAULT | core/includes/common.inc | The default group for module CSS files added to the page. |
| CSS_SYSTEM | core/includes/common.inc | The default group for system CSS files added to the page. |
| CSS_THEME | core/includes/common.inc | The default group for theme CSS files added to the page. |
| DRUPAL_ANONYMOUS_RID | core/includes/bootstrap.inc | Role ID for anonymous users; should match what's in the "role" table. |
| DRUPAL_AUTHENTICATED_RID | core/includes/bootstrap.inc | Role ID for authenticated users; should match what's in the "role" table. |
| DRUPAL_BOOTSTRAP_CONFIGURATION | core/includes/bootstrap.inc | First bootstrap phase: initialize configuration. |
| DRUPAL_BOOTSTRAP_DATABASE | core/includes/bootstrap.inc | Third bootstrap phase: initialize database layer. |
| DRUPAL_BOOTSTRAP_FULL | core/includes/bootstrap.inc | Final bootstrap phase: Drupal is fully loaded; validate and fix input data. |
| DRUPAL_BOOTSTRAP_LANGUAGE | core/includes/bootstrap.inc | Seventh bootstrap phase: find out language of the page. |
| DRUPAL_BOOTSTRAP_PAGE_CACHE | core/includes/bootstrap.inc | Second bootstrap phase: try to serve a cached page. |
| DRUPAL_BOOTSTRAP_PAGE_HEADER | core/includes/bootstrap.inc | Sixth bootstrap phase: set up the page header. |
| DRUPAL_BOOTSTRAP_SESSION | core/includes/bootstrap.inc | Fifth bootstrap phase: initialize session handling. |
| DRUPAL_BOOTSTRAP_VARIABLES | core/includes/bootstrap.inc | Fourth bootstrap phase: initialize the variable system. |
| DRUPAL_CACHE_CUSTOM | core/includes/common.inc | The block is handling its own caching in its hook_block_view(). |
| DRUPAL_CACHE_GLOBAL | core/includes/common.inc | The block or element is the same for every user and page that it is visible. |
| DRUPAL_CACHE_PER_PAGE | core/includes/common.inc | The block or element can change depending on the page being viewed. |
| DRUPAL_CACHE_PER_ROLE | core/includes/common.inc | The block or element can change depending on the user's roles. |
| DRUPAL_CACHE_PER_USER | core/includes/common.inc | The block or element can change depending on the user. |
| DRUPAL_CORE_COMPATIBILITY | core/includes/bootstrap.inc | Core API compatibility. |
| DRUPAL_CRON_DEFAULT_THRESHOLD | core/modules/system/system.module | Default interval for automatic cron executions in seconds. |
| DRUPAL_DISABLED | core/modules/system/system.module | Disabled option on forms and settings |
| DRUPAL_HASH_COUNT | core/includes/password.inc | The standard log2 number of iterations for password stretching. This should
increase by 1 every Drupal version in order to counteract increases in the
speed and power of computers available to crack the hashes. |
| DRUPAL_HASH_LENGTH | core/includes/password.inc | The expected (and maximum) number of characters in a hashed password. |
| DRUPAL_KILOBYTE | core/includes/bootstrap.inc | The number of bytes in a kilobyte. |
| DRUPAL_MAXIMUM_TEMP_FILE_AGE | core/modules/system/system.module | Maximum age of temporary files in seconds. |