| DRUPAL_DISABLED | modules/system/system.module | Disabled option on forms and settings |
| DRUPAL_HASH_COUNT | includes/password.inc | The standard log2 number of iterations for password stretching. This should
increase by 1 at least every other Drupal version in order to counteract
increases in the speed and power of computers available to crack the hashes. |
| DRUPAL_KILOBYTE | includes/bootstrap.inc | The number of bytes in a kilobyte. For more information, visit
http://en.wikipedia.org/wiki/Kilobyte. |
| DRUPAL_MAXIMUM_TEMP_FILE_AGE | modules/system/system.module | Maximum age of temporary files in seconds. |
| DRUPAL_MAX_HASH_COUNT | includes/password.inc | The maximum allowed log2 number of iterations for password stretching. |
| DRUPAL_MINIMUM_MYSQL | includes/bootstrap.inc | Minimum supported version of MySQL, if it is used. |
| DRUPAL_MINIMUM_PGSQL | includes/bootstrap.inc | Minimum supported version of PostgreSQL, if it is used. |
| DRUPAL_MINIMUM_PHP | includes/bootstrap.inc | Minimum supported version of PHP. |
| DRUPAL_MINIMUM_PHP_MEMORY_LIMIT | includes/bootstrap.inc | Minimum recommended value of PHP memory_limit. |
| DRUPAL_MIN_HASH_COUNT | includes/password.inc | The minimum allowed log2 number of iterations for password stretching. |
| DRUPAL_NO_CACHE | includes/common.inc | The block should not get cached. This setting should be used: |
| DRUPAL_OPTIONAL | modules/system/system.module | Optional option on forms and settings |
| DRUPAL_REQUIRED | modules/system/system.module | Required option on forms and settings |
| DRUPAL_ROOT | ./xmlrpc.php | Root directory of Drupal installation. |
| DRUPAL_USER_TIMEZONE_DEFAULT | modules/system/system.module | New users will be set to the default time zone at registration. |
| DRUPAL_USER_TIMEZONE_EMPTY | modules/system/system.module | New users will get an empty time zone at registration. |
| DRUPAL_USER_TIMEZONE_SELECT | modules/system/system.module | New users will select their own timezone at registration. |
| EMAIL_MAX_LENGTH | modules/user/user.module | Maximum length of user e-mail text field. |
| ERROR_REPORTING_DISPLAY_ALL | includes/errors.inc | Error reporting level: display all messages. |
| ERROR_REPORTING_DISPLAY_SOME | includes/errors.inc | Error reporting level: display errors and warnings. |
| ERROR_REPORTING_HIDE | includes/errors.inc | Error reporting level: display no errors. |
| FIELD_BEHAVIOR_CUSTOM | modules/field/field.module | TODO |
| FIELD_BEHAVIOR_DEFAULT | modules/field/field.module | TODO |
| FIELD_BEHAVIOR_NONE | modules/field/field.module | TODO |
| FIELD_CARDINALITY_UNLIMITED | modules/field/field.module | Value for $field['cardinality'] property to indicate it can hold an
unlimited number of values. |
| FIELD_LOAD_CURRENT | modules/field/field.module | Age argument for loading the most recent version of an entity's
field data with field_attach_load(). |
| FIELD_LOAD_REVISION | modules/field/field.module | Age argument for loading the version of an entity's field data
specified in the entity with field_attach_load(). |
| FIELD_QUERY_COMPLETE | modules/field/field.module | Cursor return value for field_attach_query() to indicate that no
more data is available. |
| FIELD_QUERY_NO_LIMIT | modules/field/field.module | Limit argument for field_attach_query() to request all available
entities instead of a limited number. |
| FIELD_STORAGE_INSERT | modules/field/field.attach.inc | Argument for an insert operation. |
| FIELD_STORAGE_UPDATE | modules/field/field.attach.inc | Argument for an update operation. |
| FILE_CREATE_DIRECTORY | includes/file.inc | Flag used by file_prepare_directory() -- create directory if not present. |
| FILE_EXECUTABLE | includes/install.inc | File permission check -- File is executable. |
| FILE_EXIST | includes/install.inc | File permission check -- File exists. |
| FILE_EXISTS_ERROR | includes/file.inc | Flag for dealing with existing files: Do nothing and return FALSE. |
| FILE_EXISTS_RENAME | includes/file.inc | Flag for dealing with existing files: Appends number until name is unique. |
| FILE_EXISTS_REPLACE | includes/file.inc | Flag for dealing with existing files: Replace the existing file. |
| FILE_MODIFY_PERMISSIONS | includes/file.inc | Flag used by file_prepare_directory() -- file permissions may be changed. |
| FILE_NOT_EXECUTABLE | includes/install.inc | File permission check -- File is not executable. |
| FILE_NOT_EXIST | includes/install.inc | File permission check -- File does not exist. |
| FILE_NOT_READABLE | includes/install.inc | File permission check -- File is not readable. |
| FILE_NOT_WRITABLE | includes/install.inc | File permission check -- File is not writable. |
| FILE_READABLE | includes/install.inc | File permission check -- File is readable. |
| FILE_STATUS_PERMANENT | includes/file.inc | Indicates that the file is permanent and should not be deleted. |
| FILE_URL_TEST_CDN_1 | modules/simpletest/tests/file_test.module | |
| FILE_URL_TEST_CDN_2 | modules/simpletest/tests/file_test.module | |
| FILE_WRITABLE | includes/install.inc | File permission check -- File is writable. |
| HTTP_REQUEST_TIMEOUT | includes/common.inc | Error code indicating that the request made by drupal_http_request() exceeded
the specified timeout. |
| IMAGE_STORAGE_DEFAULT | modules/image/image.module | Image style constant for module-defined presets in code. |
| IMAGE_STORAGE_EDITABLE | modules/image/image.module | Image style constant to represent an editable preset. |
