ndler::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() ) {
			if ( is_multisite() ) {
				$message = __( 'There has been a critical error on this website. Please reach out to your site administrator, and inform them of this error for further assistance.' );
			} else {
				$message = sprintf(
					/* translators: %s: Support forums URL. */
					__( 'There has been a critical error on this website. Please check your site admin email inbox for instructions. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
					__( 'https://wordpress.org/support/forums/' )
				);
			}
		} 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/documentation/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 );
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WP_Fatal_Error_Handler' not found in /home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/error-protection.php:92
Stack trace:
#0 /home/kordian1/domains/ostrabrama.pl/public_html/wp-settings.php(67): wp_register_fatal_error_handler()
#1 /home/kordian1/domains/ostrabrama.pl/public_html/wp-config.php(81): require_once('/home/kordian1/...')
#2 /home/kordian1/domains/ostrabrama.pl/public_html/wp-load.php(50): require_once('/home/kordian1/...')
#3 /home/kordian1/domains/ostrabrama.pl/public_html/wp-blog-header.php(13): require_once('/home/kordian1/...')
#4 /home/kordian1/domains/ostrabrama.pl/public_html/index.php(17): require('/home/kordian1/...')
#5 {main}
  thrown in <b>/home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/error-protection.php</b> on line <b>92</b><br />