a-constants-reference.md

Appendix A - Constants Reference

PHP Constants used throughout WordPress Core.

• ABSPATH

  Set in: wp-load.php 🔍, wp-config-sample.php 🔍

  Default value: dirname( __FILE__ )

  Description: Stores the absolute path to the WordPress root folder.

• ADMIN_COOKIE_PATH

  Set in: default-constants.php 🔍

  Default Value: SITECOOKIEPATH . 'wp-admin'

  Description: Admin backend path to store the cookie under.

• AUTH_COOKIE

  Set in: default-constants.php 🔍

  Default Value: 'wordpress_' . COOKIEHASH

  Description: Name of the cookie storing whether the user is authenticated over HTTP.

• AUTH_KEY

  Set in: wp-config-sample.php 🔍

  Description: Authentication key used to generate an authentication cookie on HTTP connections.

• AUTH_SALT

  Set in: wp-config-sample.php 🔍

  Description: Salt used on the authentication key for generating an authentication cookie on HTTP connections.

• AUTOSAVE_INTERVAL

  Set in: default-constants.php 🔍

  Default Value: 60

  Description: Interval between automatic saves in seconds.

• COOKIE_DOMAIN

  Set in: default-constants.php 🔍

  Default Value: false

  Description: Domain store the cookie under.

• COOKIE_HASH

  Set in: default-constants.php 🔍

  Default Value: md5( $siteurl )

  Description: Used to guarantee unique cookie hashes.

• COOKIEPATH

  Set in: default-constants.php 🔍

  Default Value: preg_replace('|https?://[^/]+|i', '', get_option('home') . '/' )

  Description: Home path to store the cookie under.

• DB_CHARSET

  Set in: wp-config-sample.php 🔍

  Default value: 'utf8'

  Description: Database Charset to use in creating database tables.

• DB_COLLATE

  Set in: wp-config-sample.php 🔍

  Default value: ''

  Description: The Database Collate type.

• DB_HOST

  Set in: wp-config-sample.php 🔍

  Default value: 'localhost'

  Description: MySQL hostname.

• DB_NAME

  Set in: wp-config-sample.php 🔍

  Description: The name of the database for WordPress.

• DB_PASSWORD

  Set in: wp-config-sample.php 🔍

  Description: MySQL database password.

• DB_USER

  Set in: wp-config-sample.php 🔍

  Description: MySQL database username.

• DAY_IN_SECONDS

  Set in: default-constants.php 🔍

  Value: 24 * HOUR_IN_SECONDS

  Description: Constant for expressing human-readable intervals in their respective number of seconds.

• EMPTY_TRASH_DAYS

  Set in: default-constants.php 🔍

  Default Value: 30

  Description: Interval between automatic removal of trashed elements in days.

• FORCE_SSL_ADMIN

  Set in: default-constants.php 🔍

  Default Value: true|false based on get_option('siteurl') scheme

  Description: Whether to force the admin backend to always require a secure connection.

• FORCE_SSL_LOGIN

  Description: Whether to force logged-in users to always require a secure connection.

• GB_IN_BYTES

  Set in: default-constants.php 🔍

  Value: 1024 * MB_IN_BYTES

  Description: Constant for expressing human-readable data-sizes in their respective number of bytes.

• HOUR_IN_SECONDS

  Set in: default-constants.php 🔍

  Value: 60 * MINUTE_IN_SECONDS

  Description: Constant for expressing human-readable intervals in their respective number of seconds.

• KB_IN_BYTES

  Set in: default-constants.php 🔍

  Value: 1024

  Description: Constant for expressing human-readable data-sizes in their respective number of bytes.

• LOGGED_IN_COOKIE

  Set in: default-constants.php 🔍

  Default Value: 'wordpress_logged_in_' . COOKIEHASH

  Description: Name of the cookie storing whether the user is logged in.

• LOGGED_IN_KEY

  Set in: wp-config-sample.php 🔍

  Description: Key used to generate the logged-in cookie.

• LOGGED_IN_SALT

  Set in: wp-config-sample.php 🔍

  Description: Salt used on the key for generating the logged-in cookie.

• MB_IN_BYTES

  Set in: default-constants.php 🔍

  Value: 1024 * KB_IN_BYTES

  Description: Constant for expressing human-readable data-sizes in their respective number of bytes.

• MEDIA_TRASH

  Set in: default-constants.php 🔍

  Default Value: false

  Description: Use trashcan when deleting media files.

• MINUTE_IN_SECONDS

  Set in: default-constants.php 🔍

  Value: 60

  Description: Constant for expressing human-readable intervals in their respective number of seconds.

• MONTH_IN_SECONDS

  Set in: default-constants.php 🔍

  Value: 30 * DAY_IN_SECONDS

  Description: Constant for expressing human-readable intervals in their respective number of seconds.

• MUPLUGINDIR (deprecated)

  Set in: default-constants.php 🔍

  Default Value: wp-content/mu-plugins

  Description: Path to the mu-plugins folder.

• NONCE_KEY

  Set in: wp-config-sample.php 🔍

  Description: Key used to generate a nonce.

• NONCE_SALT

  Set in: wp-config-sample.php 🔍

  Description: Salt used on the key for generating a nonce.

• PASS_COOKIE (deprecated)

  Set in: default-constants.php 🔍

  Default Value: 'wordpresspass_' . COOKIEHASH

  Description: Name of the cookie storing the user's double-hashed password.

• PLUGINDIR (deprecated)

  Set in: default-constants.php 🔍

  Default Value: wp-content/plugins

  Description: Path to the plugins folder.

• PLUGINS_COOKIE_PATH

  Set in: default-constants.php 🔍

  Default Value: preg_replace('|https?://[^/]+|i', '', WP_PLUGIN_URL )

  Description: Plugins folder path to store the cookie under.

• SCRIPT_DEBUG

  Set in: default-constants.php 🔍

  Default Value: false

  Description: Load of non-minified, non-concatenated scripts and stylesheets.

• SECURE_AUTH_COOKIE

  Set in: default-constants.php 🔍

  Default Value: 'wordpress_sec_' . COOKIEHASH

  Description: Name of the cookie storing whether the user is authenticated over HTTPS.

• SECURE_AUTH_KEY

  Set in: wp-config-sample.php 🔍

  Description: Authentication key used to generate an authentication cookie on HTTPS connections.

• SECURE_AUTH_SALT

  Set in: wp-config-sample.php 🔍

  Description: Salt used on the authentication key for generating an authentication cookie on HTTPS connections.

• SHORTINIT

  Set in: default-constants.php 🔍

  Default Value: false

  Description: Short-circuit the WordPress loading process to run a minimal system.

• SITECOOKIEPATH

  Set in: default-constants.php 🔍

  Default Value: preg_replace('|https?://[^/]+|i', '', get_option('siteurl') . '/' )

  Description: Site URL path to store the cookie under.

• STYLESHEETPATH

  Set in: default-constants.php 🔍

  Default Value: get_stylesheet_directory()

  Description: Filesystem path to the current active template stylesheet directory.

• TB_IN_BYTES

  Set in: default-constants.php 🔍

  Value: 1024 * GB_IN_BYTES

  Description: Constant for expressing human-readable data-sizes in their respective number of bytes.

• TEMPLATEPATH

  Set in: default-constants.php 🔍

  Default Value: get_template_directory()

  Description: Filesystem path to the current active template directory.

• TEST_COOKIE

  Set in: default-constants.php 🔍

  Default Value: 'wordpress_test_cookie_' . COOKIEHASH

  Description: Name of the cookie used to test whether the browser supports cookies.

• USER_COOKIE (deprecated)

  Set in: default-constants.php 🔍

  Default Value: 'wordpressuser_' . COOKIEHASH

  Description: Name of the cookie storing the user name.

• WEEK_IN_SECONDS

  Set in: default-constants.php 🔍

  Value: 7 * DAY_IN_SECONDS

  Description: Constant for expressing human-readable intervals in their respective number of seconds.

• WP_CACHE

  Set in: default-constants.php 🔍

  Default Value: false

  Description: Cache generated WordPress output.

• WP_CONTENT_DIR

  Set in: default-constants.php 🔍

  Default Value: ABSPATH . 'wp-content'

  Description: Path to the content folder.

• WP_CONTENT_URL

  Set in: default-constants.php 🔍

  Default Value: get_option('siteurl') . '/wp-content'

  Description: URL location of the content folder.

• WP_CRON_LOCK_TIMEOUT

  Set in: default-constants.php 🔍

  Default Value: 60

  Description: Timeout for the lock file for cron scripts in seconds.

• WP_DEBUG

  Set in: wp-config-sample.php 🔍, default-constants.php 🔍

  Default value: false

  Description: WordPress debugging mode.

• WP_DEBUG_DISPLAY

  Set in: default-constants.php 🔍

  Default value: true

  Description: Display PHP errors.

• WP_DEBUG_LOG

  Set in: default-constants.php 🔍

  Default value: false

  Description: Log PHP errors to WP_CONTENT_DIR/debug.log.

• WP_DEFAULT_THEME

  Set in: default-constants.php 🔍

  Default Value: 'twentyseventeen' (as of WordPress 4.8)

  Description: Default theme to pick if none was set.

• WP_FEATURE_BETTER_PASSWORDS

  Set in: default-constants.php 🔍

  Default Value: true

  Description: Constant for "Better Passwords"-feature added to WordPress that should short-circuit its plugin implementation.

• WP_MAX_MEMORY_LIMIT

  Set in: default-constants.php 🔍

  Default Value: 256M

  Description: PHP process maximum memory limit.

• WP_MEMORY_LIMIT

  Set in: default-constants.php 🔍

  Default Value: 40M (64M on multisite)

  Description: PHP process default memory limit.

• WP_PLUGIN_DIR

  Set in: default-constants.php 🔍

  Default Value: WP_CONTENT_DIR . '/plugins'

  Description: Path to the plugins folder.

• WP_PLUGIN_URL

  Set in: default-constants.php 🔍

  Default Value: WP_CONTENT_URL . '/plugins'

  Description: URL location of the plugins folder.

• WP_POST_REVISIONS

  Set in: default-constants.php 🔍

  Default Value: true

  Description: Whether to store multiple versioned revisions for edited posts.

• WP_USE_THEMES

  Set in: index.php 🔍

  Default value: true

  Description: Tells WordPress to load the WordPress theme and output it.

• WPINC

  Set in: wp-load.php 🔍

  Default value: 'wp-includes'

  Description: Directory name of the folder that contains the includes.

• WPMU_PLUGIN_DIR

  Set in: default-constants.php 🔍

  Default Value: WP_CONTENT_DIR . '/mu-plugins'

  Description: Path to the mu-plugins folder.

• WPMU_PLUGIN_URL

  Set in: default-constants.php 🔍

  Default Value: WP_CONTENT_URL . '/mu-plugins'

  Description: URL location of the mu-plugins folder.

• YEAR_IN_SECONDS

  Set in: default-constants.php 🔍

  Value: 365 * DAY_IN_SECONDS

  Description: Constant for expressing human-readable intervals in their respective number of seconds.