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