wp-includes/default-constants.php:376Defines functionality-related WordPress constants.
function wp_functionality_constants() { /** * @since 2.5.0 */ if ( ! defined( 'AUTOSAVE_INTERVAL' ) ) { define( 'AUTOSAVE_INTERVAL', MINUTE_IN_SECONDS ); } /** * @since 2.9.0 */ if ( ! defined( 'EMPTY_TRASH_DAYS' ) ) { define( 'EMPTY_TRASH_DAYS', 30 ); } if ( ! defined( 'WP_POST_REVISIONS' ) ) { define( 'WP_POST_REVISIONS', true ); } /** * @since 3.3.0 */ if ( ! defined( 'WP_CRON_LOCK_TIMEOUT' ) ) { define( 'WP_CRON_LOCK_TIMEOUT', MINUTE_IN_SECONDS ); }}Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/default-constants.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.