wp_functionality_constants

 * Defines functionality-related WordPress constants.
 *
 * @since 3.0.0
 */
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
	 */