wp_debug_mode()

574function wp_debug_mode() {575	/**576	 * Filters whether to allow the debug mode check to occur.577	 *578	 * This filter runs before it can be used by plugins. It is designed for579	 * non-web runtimes. Returning false causes the `WP_DEBUG` and related580	 * constants to not be checked and the default PHP values for errors581	 * will be used unless you take care to update them yourself.582	 *583	 * To use this filter you must define a `$wp_filter` global before584	 * WordPress loads, usually in `wp-config.php`.585	 *586	 * Example:587	 *588	 *     $GLOBALS['wp_filter'] = array(589	 *         'enable_wp_debug_mode_checks' => array(590	 *             10 => array(591	 *                 array(592	 *                     'accepted_args' => 0,593	 *                     'function'      => function() {594	 *                         return false;595	 *                     },596	 *                 ),597	 *             ),598	 *         ),599	 *     );600	 *601	 * @since 4.6.0602	 *603	 * @param bool $enable_debug_mode Whether to enable debug mode checks to occur. Default true.604	 */605	if ( ! apply_filters( 'enable_wp_debug_mode_checks', true ) ) {606		return;607	}608 609	if ( WP_DEBUG ) {610		error_reporting( E_ALL );611 612		if ( WP_DEBUG_DISPLAY ) {613			ini_set( 'display_errors', 1 );614		} elseif ( null !== WP_DEBUG_DISPLAY ) {615			ini_set( 'display_errors', 0 );616		}617 618		if ( in_array( strtolower( (string) WP_DEBUG_LOG ), array( 'true', '1' ), true ) ) {619			$log_path = WP_CONTENT_DIR . '/debug.log';620		} elseif ( is_string( WP_DEBUG_LOG ) ) {621			$log_path = WP_DEBUG_LOG;622		} else {623			$log_path = false;624		}625 626		if ( $log_path ) {627			ini_set( 'log_errors', 1 );628			ini_set( 'error_log', $log_path );629		}630	} else {631		error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );632	}633 634	/*635	 * The 'REST_REQUEST' check here is optimistic as the constant is most636	 * likely not set at this point even if it is in fact a REST request.637	 */638	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) || defined( 'MS_FILES_REQUEST' )639		|| ( defined( 'WP_INSTALLING' ) && WP_INSTALLING )640		|| wp_doing_ajax() || wp_is_json_request()641	) {642		ini_set( 'display_errors', 0 );643	}644}