Constants Reference

Path Constants

• SELF - Name of the bootstrap file
• FCPATH - Path to the bootstrap file
• SYSDIR - Name of the system directory
• SYSPATH - Path of the system directory
• APPPATH and BASEPATH - Path to the system/ee/legacy directory
• PATH_ADDONS - Path to the first-party add-ons directory
• PATH_THEMES - Path to the themes directory
• PATH_RTE - Path to the first party RTE tools directory
• PATH_MBR_THEMES - Path to the member themes directory
• PATH_CP_GBL_IMG - Path to the global image directory
• PATH_JAVASCRIPT - Path to the javascript directory
• PATH_JQUERY - Path to the jQuery directory
• PATH_THIRD - Path to third-party add-ons directory
• PATH_THIRD_THEMES - Path to the third-party themes directory

Version Constants

• APP_NAME - Application Name
• APP_VER - Version number
• APP_BUILD - Build number

URL Constants

• BASE - Base URL to the control panel
• AMP - &
• QUERY_MARKER - Question mark if forcing query strings, blank otherwise
• URL_THEMES - URL to the theme folder
• URL_THIRD_THEMES - URL to the third-party theme folder

HTML Constants

• NBS -  
• BR - <br />
• NL - \\n

Request Constants

• REQ - One of: 'PAGE', 'CP', 'ACTION'
• AJAX_REQUEST - (bool) TRUE if request came from one of jQuery’s ajax functions

Filesystem Mode Constants

These constants are located in expressionengine/config/constants.php, and are user configurable to their hosts’ requirements. You should always use these constants for creating and writing to files so that you do not have to worry about which permissions to use. Listed alongside each is their default equivalency.

• FILE_READ_MODE - Equivalent to 0644
• FILE_WRITE_MODE - Equivalent to 0666
• DIR_READ_MODE - Equivalent to 0755
• DIR_WRITE_MODE - Equivalent to 0777
• FOPEN_READ - Equivalent to rb
• FOPEN_READ_WRITE - Equivalent to r+b
• FOPEN_WRITE_CREATE_DESTRUCTIVE - Equivalent to wb
• FOPEN_READ_WRITE_CREATE_DESTRUCTIVE - Equivalent to w+b
• FOPEN_WRITE_CREATE - Equivalent to ab
• FOPEN_READ_WRITE_CREATE - Equivalent to a+b
• FOPEN_WRITE_CREATE_STRICT - Equivalent to xb
• FOPEN_READ_WRITE_CREATE_STRICT - Equivalent to x+b

Others

• LD - Left template tag delimiter (usually {)
• RD - Right template tag delimiter (usually })
• DEBUG - (bool) TRUE if $debug is set to 1
• CSRF_TOKEN - CSRF token, blank if csrf protection is disabled.
• XID_SECURE_HASH - previous name of CSRF_TOKEN
• MASKED_CP - (bool) TRUE if the CP is masked for this request
• EXT - File extension (.php)
• UTF8_ENABLED - Server has proper UTF-8 support
• MB_ENABLED - Server has multibyte function support
• PASSWORD_MAX_LENGTH - Maximum number of characters for a password.