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class-wp-fatal-error-handler.php (7575B)

---

 <?php
 /**
  * Error Protection API: WP_Fatal_Error_Handler class
  *
  * @package WordPress
  * @since 5.2.0
  */
 
 /**
  * Core class used as the default shutdown handler for fatal errors.
  *
  * A drop-in 'fatal-error-handler.php' can be used to override the instance of this class and use a custom
  * implementation for the fatal error handler that WordPress registers. The custom class should extend this class and
  * can override its methods individually as necessary. The file must return the instance of the class that should be
  * registered.
  *
  * @since 5.2.0
  */
 class WP_Fatal_Error_Handler {
 
 	/**
 	 * Runs the shutdown handler.
 	 *
 	 * This method is registered via `register_shutdown_function()`.
 	 *
 	 * @since 5.2.0
 	 */
 	public function handle() {
 		if ( defined( 'WP_SANDBOX_SCRAPING' ) && WP_SANDBOX_SCRAPING ) {
 			return;
 		}
 
 		// Do not trigger the fatal error handler while updates are being installed.
 		if ( wp_is_maintenance_mode() ) {
 			return;
 		}
 
 		try {
 			// Bail if no error found.
 			$error = $this->detect_error();
 			if ( ! $error ) {
 				return;
 			}
 
 			if ( ! isset( $GLOBALS['wp_locale'] ) && function_exists( 'load_default_textdomain' ) ) {
 				load_default_textdomain();
 			}
 
 			$handled = false;
 
 			if ( ! is_multisite() && wp_recovery_mode()->is_initialized() ) {
 				$handled = wp_recovery_mode()->handle_error( $error );
 			}
 
 			// Display the PHP error template if headers not sent.
 			if ( is_admin() || ! headers_sent() ) {
 				$this->display_error_template( $error, $handled );
 			}
 		} catch ( Exception $e ) {
 			// Catch exceptions and remain silent.
 		}
 	}
 
 	/**
 	 * Detects the error causing the crash if it should be handled.
 	 *
 	 * @since 5.2.0
 	 *
 	 * @return array|null Error that was triggered, or null if no error received or if the error should not be handled.
 	 */
 	protected function detect_error() {
 		$error = error_get_last();
 
 		// No error, just skip the error handling code.
 		if ( null === $error ) {
 			return null;
 		}
 
 		// Bail if this error should not be handled.
 		if ( ! $this->should_handle_error( $error ) ) {
 			return null;
 		}
 
 		return $error;
 	}
 
 	/**
 	 * Determines whether we are dealing with an error that WordPress should handle
 	 * in order to protect the admin backend against WSODs.
 	 *
 	 * @since 5.2.0
 	 *
 	 * @param array $error Error information retrieved from error_get_last().
 	 * @return bool Whether WordPress should handle this error.
 	 */
 	protected function should_handle_error( $error ) {
 		$error_types_to_handle = array(
 			E_ERROR,
 			E_PARSE,
 			E_USER_ERROR,
 			E_COMPILE_ERROR,
 			E_RECOVERABLE_ERROR,
 		);
 
 		if ( isset( $error['type'] ) && in_array( $error['type'], $error_types_to_handle, true ) ) {
 			return true;
 		}
 
 		/**
 		 * Filters whether a given thrown error should be handled by the fatal error handler.
 		 *
 		 * This filter is only fired if the error is not already configured to be handled by WordPress core. As such,
 		 * it exclusively allows adding further rules for which errors should be handled, but not removing existing
 		 * ones.
 		 *
 		 * @since 5.2.0
 		 *
 		 * @param bool  $should_handle_error Whether the error should be handled by the fatal error handler.
 		 * @param array $error               Error information retrieved from error_get_last().
 		 */
 		return (bool) apply_filters( 'wp_should_handle_php_error', false, $error );
 	}
 
 	/**
 	 * Displays the PHP error template and sends the HTTP status code, typically 500.
 	 *
 	 * A drop-in 'php-error.php' can be used as a custom template. This drop-in should control the HTTP status code and
 	 * print the HTML markup indicating that a PHP error occurred. Note that this drop-in may potentially be executed
 	 * very early in the WordPress bootstrap process, so any core functions used that are not part of
 	 * `wp-includes/load.php` should be checked for before being called.
 	 *
 	 * If no such drop-in is available, this will call {@see WP_Fatal_Error_Handler::display_default_error_template()}.
 	 *
 	 * @since 5.2.0
 	 * @since 5.3.0 The `$handled` parameter was added.
 	 *
 	 * @param array         $error   Error information retrieved from `error_get_last()`.
 	 * @param true|WP_Error $handled Whether Recovery Mode handled the fatal error.
 	 */
 	protected function display_error_template( $error, $handled ) {
 		if ( defined( 'WP_CONTENT_DIR' ) ) {
 			// Load custom PHP error template, if present.
 			$php_error_pluggable = WP_CONTENT_DIR . '/php-error.php';
 			if ( is_readable( $php_error_pluggable ) ) {
 				require_once $php_error_pluggable;
 
 				return;
 			}
 		}
 
 		// Otherwise, display the default error template.
 		$this->display_default_error_template( $error, $handled );
 	}
 
 	/**
 	 * Displays the default PHP error template.
 	 *
 	 * This method is called conditionally if no 'php-error.php' drop-in is available.
 	 *
 	 * It calls {@see wp_die()} with a message indicating that the site is experiencing technical difficulties and a
 	 * login link to the admin backend. The {@see 'wp_php_error_message'} and {@see 'wp_php_error_args'} filters can
 	 * be used to modify these parameters.
 	 *
 	 * @since 5.2.0
 	 * @since 5.3.0 The `$handled` parameter was added.
 	 *
 	 * @param array         $error   Error information retrieved from `error_get_last()`.
 	 * @param true|WP_Error $handled Whether Recovery Mode handled the fatal error.
 	 */
 	protected function display_default_error_template( $error, $handled ) {
 		if ( ! function_exists( '__' ) ) {
 			wp_load_translations_early();
 		}
 
 		if ( ! function_exists( 'wp_die' ) ) {
 			require_once ABSPATH . WPINC . '/functions.php';
 		}
 
 		if ( ! class_exists( 'WP_Error' ) ) {
 			require_once ABSPATH . WPINC . '/class-wp-error.php';
 		}
 
 		if ( true === $handled && wp_is_recovery_mode() ) {
 			$message = __( 'There has been a critical error on this website, putting it in recovery mode. Please check the Themes and Plugins screens for more details. If you just installed or updated a theme or plugin, check the relevant page for that first.' );
 		} elseif ( is_protected_endpoint() && wp_recovery_mode()->is_initialized() ) {
 			$message = __( 'There has been a critical error on this website. Please check your site admin email inbox for instructions.' );
 		} else {
 			$message = __( 'There has been a critical error on this website.' );
 		}
 
 		$message = sprintf(
 			'<p>%s</p><p><a href="%s">%s</a></p>',
 			$message,
 			/* translators: Documentation about troubleshooting. */
 			__( 'https://wordpress.org/support/article/faq-troubleshooting/' ),
 			__( 'Learn more about troubleshooting WordPress.' )
 		);
 
 		$args = array(
 			'response' => 500,
 			'exit'     => false,
 		);
 
 		/**
 		 * Filters the message that the default PHP error template displays.
 		 *
 		 * @since 5.2.0
 		 *
 		 * @param string $message HTML error message to display.
 		 * @param array  $error   Error information retrieved from `error_get_last()`.
 		 */
 		$message = apply_filters( 'wp_php_error_message', $message, $error );
 
 		/**
 		 * Filters the arguments passed to {@see wp_die()} for the default PHP error template.
 		 *
 		 * @since 5.2.0
 		 *
 		 * @param array $args Associative array of arguments passed to `wp_die()`. By default these contain a
 		 *                    'response' key, and optionally 'link_url' and 'link_text' keys.
 		 * @param array $error Error information retrieved from `error_get_last()`.
 		 */
 		$args = apply_filters( 'wp_php_error_args', $args, $error );
 
 		$wp_error = new WP_Error(
 			'internal_server_error',
 			$message,
 			array(
 				'error' => $error,
 			)
 		);
 
 		wp_die( $wp_error, '', $args );
 	}
 }