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1e4088fc98
WordPress/wp-settings.php
Felix Arntz 1e4088fc98 Bootstrap/Load: Introduce fatal error recovery mechanism allowing users to still log in to their admin dashboard. 
This changeset introduces a `WP_Shutdown_Handler` class that detects fatal errors and which extension (plugin or theme) causes them. Such an error is then recorded, and an error message is displayed. Subsequently, in certain protected areas, for example the admin, the broken extension will be paused, ensuring that the website is still usable in the respective area. The major benefit is that this mechanism allows site owners to still log in to their website, to fix the problem by either disabling the extension or solving the bug and then resuming the extension.

Extensions are only paused in certain designated areas. The frontend for example stays unaffected, as it is impossible to know what pausing the extension would cause to be missing, so it might be preferrable to clearly see that the website is temporarily not accessible instead.

The fatal error recovery is especially important in scope of encouraging the switch to a maintained PHP version, as not necessarily every WordPress extension is compatible with all PHP versions. If problems occur now, non-technical site owners that do not have immediate access to the codebase are not locked out of their site and can at least temporarily solve the problem quickly.

Websites that have custom requirements in that regard can implement their own shutdown handler by adding a `shutdown-handler.php` drop-in that returns the handler instance to use, which must be based on a class that inherits `WP_Shutdown_Handler`. That handler will then be used in place of the default one.

Websites that would like to modify specifically the error template displayed in the frontend can add a `php-error.php` drop-in that works similarly to the existing `db-error.php` drop-in.

Props afragen, bradleyt, flixos90, ocean90, schlessera, SergeyBiryukov, spacedmonkey.
Fixes #44458.

Built from https://develop.svn.wordpress.org/trunk@44524


git-svn-id: http://core.svn.wordpress.org/trunk@44355 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-01-09 20:05:49 +00:00

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PHP
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<?php
/**
* Used to set up and fix common variables and include
* the WordPress procedural and class library.
*
* Allows for some configuration in wp-config.php (see default-constants.php)
*
* @package WordPress
*/
/**
* Stores the location of the WordPress directory of functions, classes, and core content.
*
* @since 1.0.0
*/
define( 'WPINC', 'wp-includes' );
// Include files required for initialization.
require( ABSPATH . WPINC . '/load.php' );
require( ABSPATH . WPINC . '/class-wp-paused-extensions-storage.php' );
require( ABSPATH . WPINC . '/class-wp-shutdown-handler.php' );
require( ABSPATH . WPINC . '/error-protection.php' );
require( ABSPATH . WPINC . '/default-constants.php' );
require_once( ABSPATH . WPINC . '/plugin.php' );
// Make sure we register the premature shutdown handler as soon as possible.
wp_register_premature_shutdown_handler();
/*
* These can't be directly globalized in version.php. When updating,
* we're including version.php from another installation and don't want
* these values to be overridden if already set.
*/
global $wp_version, $wp_db_version, $tinymce_version, $required_php_version, $required_mysql_version, $wp_local_package;
require( ABSPATH . WPINC . '/version.php' );
/**
* If not already configured, `$blog_id` will default to 1 in a single site
* configuration. In multisite, it will be overridden by default in ms-settings.php.
*
* @global int $blog_id
* @since 2.0.0
*/
global $blog_id;
// Set initial default constants including WP_MEMORY_LIMIT, WP_MAX_MEMORY_LIMIT, WP_DEBUG, SCRIPT_DEBUG, WP_CONTENT_DIR and WP_CACHE.
wp_initial_constants();
// Check for the required PHP version and for the MySQL extension or a database drop-in.
wp_check_php_mysql_versions();
// Disable magic quotes at runtime. Magic quotes are added using wpdb later in wp-settings.php.
@ini_set( 'magic_quotes_runtime', 0 );
@ini_set( 'magic_quotes_sybase', 0 );
// WordPress calculates offsets from UTC.
date_default_timezone_set( 'UTC' );
// Turn register_globals off.
wp_unregister_GLOBALS();
// Standardize $_SERVER variables across setups.
wp_fix_server_vars();
// Check if we have received a request due to missing favicon.ico
wp_favicon_request();
// Check if we're in maintenance mode.
wp_maintenance();
// Start loading timer.
timer_start();
// Check if we're in WP_DEBUG mode.
wp_debug_mode();
/**
* Filters whether to enable loading of the advanced-cache.php drop-in.
*
* This filter runs before it can be used by plugins. It is designed for non-web
* run-times. If false is returned, advanced-cache.php will never be loaded.
*
* @since 4.6.0
*
* @param bool $enable_advanced_cache Whether to enable loading advanced-cache.php (if present).
* Default true.
*/
if ( WP_CACHE && apply_filters( 'enable_loading_advanced_cache_dropin', true ) ) {
// For an advanced caching plugin to use. Uses a static drop-in because you would only want one.
WP_DEBUG ? include( WP_CONTENT_DIR . '/advanced-cache.php' ) : @include( WP_CONTENT_DIR . '/advanced-cache.php' );
// Re-initialize any hooks added manually by advanced-cache.php
if ( $wp_filter ) {
$wp_filter = WP_Hook::build_preinitialized_hooks( $wp_filter );
}
}
// Define WP_LANG_DIR if not set.
wp_set_lang_dir();
// Load early WordPress files.
require( ABSPATH . WPINC . '/compat.php' );
require( ABSPATH . WPINC . '/class-wp-list-util.php' );
require( ABSPATH . WPINC . '/formatting.php' );
require( ABSPATH . WPINC . '/meta.php' );
require( ABSPATH . WPINC . '/functions.php' );
require( ABSPATH . WPINC . '/class-wp-meta-query.php' );
require( ABSPATH . WPINC . '/class-wp-matchesmapregex.php' );
require( ABSPATH . WPINC . '/class-wp.php' );
require( ABSPATH . WPINC . '/class-wp-error.php' );
require( ABSPATH . WPINC . '/pomo/mo.php' );
// Include the wpdb class and, if present, a db.php database drop-in.
global $wpdb;
require_wp_db();
// Set the database table prefix and the format specifiers for database table columns.
$GLOBALS['table_prefix'] = $table_prefix;
wp_set_wpdb_vars();
// Start the WordPress object cache, or an external object cache if the drop-in is present.
wp_start_object_cache();
// Attach the default filters.
require( ABSPATH . WPINC . '/default-filters.php' );
// Initialize multisite if enabled.
if ( is_multisite() ) {
require( ABSPATH . WPINC . '/class-wp-site-query.php' );
require( ABSPATH . WPINC . '/class-wp-network-query.php' );
require( ABSPATH . WPINC . '/ms-blogs.php' );
require( ABSPATH . WPINC . '/ms-settings.php' );
} elseif ( ! defined( 'MULTISITE' ) ) {
define( 'MULTISITE', false );
}
register_shutdown_function( 'shutdown_action_hook' );
// Stop most of WordPress from being loaded if we just want the basics.
if ( SHORTINIT ) {
return false;
}
// Load the L10n library.
require_once( ABSPATH . WPINC . '/l10n.php' );
require_once( ABSPATH . WPINC . '/class-wp-locale.php' );
require_once( ABSPATH . WPINC . '/class-wp-locale-switcher.php' );
// Run the installer if WordPress is not installed.
wp_not_installed();
// Load most of WordPress.
require( ABSPATH . WPINC . '/class-wp-walker.php' );
require( ABSPATH . WPINC . '/class-wp-ajax-response.php' );
require( ABSPATH . WPINC . '/capabilities.php' );
require( ABSPATH . WPINC . '/class-wp-roles.php' );
require( ABSPATH . WPINC . '/class-wp-role.php' );
require( ABSPATH . WPINC . '/class-wp-user.php' );
require( ABSPATH . WPINC . '/class-wp-query.php' );
require( ABSPATH . WPINC . '/query.php' );
require( ABSPATH . WPINC . '/date.php' );
require( ABSPATH . WPINC . '/theme.php' );
require( ABSPATH . WPINC . '/class-wp-theme.php' );
require( ABSPATH . WPINC . '/template.php' );
require( ABSPATH . WPINC . '/user.php' );
require( ABSPATH . WPINC . '/class-wp-user-query.php' );
require( ABSPATH . WPINC . '/class-wp-session-tokens.php' );
require( ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php' );
require( ABSPATH . WPINC . '/class-wp-metadata-lazyloader.php' );
require( ABSPATH . WPINC . '/general-template.php' );
require( ABSPATH . WPINC . '/link-template.php' );
require( ABSPATH . WPINC . '/author-template.php' );
require( ABSPATH . WPINC . '/post.php' );
require( ABSPATH . WPINC . '/class-walker-page.php' );
require( ABSPATH . WPINC . '/class-walker-page-dropdown.php' );
require( ABSPATH . WPINC . '/class-wp-post-type.php' );
require( ABSPATH . WPINC . '/class-wp-post.php' );
require( ABSPATH . WPINC . '/post-template.php' );
require( ABSPATH . WPINC . '/revision.php' );
require( ABSPATH . WPINC . '/post-formats.php' );
require( ABSPATH . WPINC . '/post-thumbnail-template.php' );
require( ABSPATH . WPINC . '/category.php' );
require( ABSPATH . WPINC . '/class-walker-category.php' );
require( ABSPATH . WPINC . '/class-walker-category-dropdown.php' );
require( ABSPATH . WPINC . '/category-template.php' );
require( ABSPATH . WPINC . '/comment.php' );
require( ABSPATH . WPINC . '/class-wp-comment.php' );
require( ABSPATH . WPINC . '/class-wp-comment-query.php' );
require( ABSPATH . WPINC . '/class-walker-comment.php' );
require( ABSPATH . WPINC . '/comment-template.php' );
require( ABSPATH . WPINC . '/rewrite.php' );
require( ABSPATH . WPINC . '/class-wp-rewrite.php' );
require( ABSPATH . WPINC . '/feed.php' );
require( ABSPATH . WPINC . '/bookmark.php' );
require( ABSPATH . WPINC . '/bookmark-template.php' );
require( ABSPATH . WPINC . '/kses.php' );
require( ABSPATH . WPINC . '/cron.php' );
require( ABSPATH . WPINC . '/deprecated.php' );
require( ABSPATH . WPINC . '/script-loader.php' );
require( ABSPATH . WPINC . '/taxonomy.php' );
require( ABSPATH . WPINC . '/class-wp-taxonomy.php' );
require( ABSPATH . WPINC . '/class-wp-term.php' );
require( ABSPATH . WPINC . '/class-wp-term-query.php' );
require( ABSPATH . WPINC . '/class-wp-tax-query.php' );
require( ABSPATH . WPINC . '/update.php' );
require( ABSPATH . WPINC . '/canonical.php' );
require( ABSPATH . WPINC . '/shortcodes.php' );
require( ABSPATH . WPINC . '/embed.php' );
require( ABSPATH . WPINC . '/class-wp-embed.php' );
require( ABSPATH . WPINC . '/class-oembed.php' );
require( ABSPATH . WPINC . '/class-wp-oembed-controller.php' );
require( ABSPATH . WPINC . '/media.php' );
require( ABSPATH . WPINC . '/http.php' );
require( ABSPATH . WPINC . '/class-http.php' );
require( ABSPATH . WPINC . '/class-wp-http-streams.php' );
require( ABSPATH . WPINC . '/class-wp-http-curl.php' );
require( ABSPATH . WPINC . '/class-wp-http-proxy.php' );
require( ABSPATH . WPINC . '/class-wp-http-cookie.php' );
require( ABSPATH . WPINC . '/class-wp-http-encoding.php' );
require( ABSPATH . WPINC . '/class-wp-http-response.php' );
require( ABSPATH . WPINC . '/class-wp-http-requests-response.php' );
require( ABSPATH . WPINC . '/class-wp-http-requests-hooks.php' );
require( ABSPATH . WPINC . '/widgets.php' );
require( ABSPATH . WPINC . '/class-wp-widget.php' );
require( ABSPATH . WPINC . '/class-wp-widget-factory.php' );
require( ABSPATH . WPINC . '/nav-menu.php' );
require( ABSPATH . WPINC . '/nav-menu-template.php' );
require( ABSPATH . WPINC . '/admin-bar.php' );
require( ABSPATH . WPINC . '/rest-api.php' );
require( ABSPATH . WPINC . '/rest-api/class-wp-rest-server.php' );
require( ABSPATH . WPINC . '/rest-api/class-wp-rest-response.php' );
require( ABSPATH . WPINC . '/rest-api/class-wp-rest-request.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-posts-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-attachments-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-post-types-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-post-statuses-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-revisions-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-autosaves-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-taxonomies-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-terms-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-users-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-comments-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-search-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-blocks-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-block-renderer-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-settings-controller.php' );
require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-themes-controller.php' );
require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-meta-fields.php' );
require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-comment-meta-fields.php' );
require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-post-meta-fields.php' );
require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-term-meta-fields.php' );
require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-user-meta-fields.php' );
require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-search-handler.php' );
require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-post-search-handler.php' );
require( ABSPATH . WPINC . '/class-wp-block-type.php' );
require( ABSPATH . WPINC . '/class-wp-block-type-registry.php' );
require( ABSPATH . WPINC . '/class-wp-block-parser.php' );
require( ABSPATH . WPINC . '/blocks.php' );
require( ABSPATH . WPINC . '/blocks/archives.php' );
require( ABSPATH . WPINC . '/blocks/block.php' );
require( ABSPATH . WPINC . '/blocks/categories.php' );
require( ABSPATH . WPINC . '/blocks/latest-comments.php' );
require( ABSPATH . WPINC . '/blocks/latest-posts.php' );
require( ABSPATH . WPINC . '/blocks/shortcode.php' );
$GLOBALS['wp_embed'] = new WP_Embed();
// Load multisite-specific files.
if ( is_multisite() ) {
require( ABSPATH . WPINC . '/ms-functions.php' );
require( ABSPATH . WPINC . '/ms-default-filters.php' );
require( ABSPATH . WPINC . '/ms-deprecated.php' );
}
// Define constants that rely on the API to obtain the default value.
// Define must-use plugin directory constants, which may be overridden in the sunrise.php drop-in.
wp_plugin_directory_constants();
$GLOBALS['wp_plugin_paths'] = array();
// Load must-use plugins.
foreach ( wp_get_mu_plugins() as $mu_plugin ) {
include_once( $mu_plugin );
/**
* Fires once a single must-use plugin has loaded.
*
* @since 5.1.0
*
* @param string $mu_plugin Loaded plugin's basename.
*/
do_action( 'mu_plugin_loaded', $mu_plugin );
}
unset( $mu_plugin );
// Load network activated plugins.
if ( is_multisite() ) {
foreach ( wp_get_active_network_plugins() as $network_plugin ) {
wp_register_plugin_realpath( $network_plugin );
include_once( $network_plugin );
/**
* Fires once a single network-activated plugin has loaded.
*
* @since 5.1.0
*
* @param string $network_plugin Loaded plugin's basename.
*/
do_action( 'network_plugin_loaded', $network_plugin );
}
unset( $network_plugin );
}
/**
* Fires once all must-use and network-activated plugins have loaded.
*
* @since 2.8.0
*/
do_action( 'muplugins_loaded' );
if ( is_multisite() ) {
ms_cookie_constants();
}
// Define constants after multisite is loaded.
wp_cookie_constants();
// Define and enforce our SSL constants
wp_ssl_constants();
// Create common globals.
require( ABSPATH . WPINC . '/vars.php' );
// Make taxonomies and posts available to plugins and themes.
// @plugin authors: warning: these get registered again on the init hook.
create_initial_taxonomies();
create_initial_post_types();
wp_start_scraping_edited_file_errors();
// Register the default theme directory root
register_theme_directory( get_theme_root() );
// Load active plugins.
foreach ( wp_get_active_and_valid_plugins() as $plugin ) {
wp_register_plugin_realpath( $plugin );
include_once( $plugin );
/**
* Fires once a single activated plugin has loaded.
*
* @since 5.1.0
*
* @param string $plugin Loaded plugin's basename.
*/
do_action( 'plugin_loaded', $plugin );
}
unset( $plugin );
// Load pluggable functions.
require( ABSPATH . WPINC . '/pluggable.php' );
require( ABSPATH . WPINC . '/pluggable-deprecated.php' );
// Set internal encoding.
wp_set_internal_encoding();
// Run wp_cache_postload() if object cache is enabled and the function exists.
if ( WP_CACHE && function_exists( 'wp_cache_postload' ) ) {
wp_cache_postload();
}
/**
* Fires once activated plugins have loaded.
*
* Pluggable functions are also available at this point in the loading order.
*
* @since 1.5.0
*/
do_action( 'plugins_loaded' );
// Define constants which affect functionality if not already defined.
wp_functionality_constants();
// Add magic quotes and set up $_REQUEST ( $_GET + $_POST )
wp_magic_quotes();
/**
* Fires when comment cookies are sanitized.
*
* @since 2.0.11
*/
do_action( 'sanitize_comment_cookies' );
/**
* WordPress Query object
*
* @global WP_Query $wp_the_query
* @since 2.0.0
*/
$GLOBALS['wp_the_query'] = new WP_Query();
/**
* Holds the reference to @see $wp_the_query
* Use this global for WordPress queries
*
* @global WP_Query $wp_query
* @since 1.5.0
*/
$GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];
/**
* Holds the WordPress Rewrite object for creating pretty URLs
*
* @global WP_Rewrite $wp_rewrite
* @since 1.5.0
*/
$GLOBALS['wp_rewrite'] = new WP_Rewrite();
/**
* WordPress Object
*
* @global WP $wp
* @since 2.0.0
*/
$GLOBALS['wp'] = new WP();
/**
* WordPress Widget Factory Object
*
* @global WP_Widget_Factory $wp_widget_factory
* @since 2.8.0
*/
$GLOBALS['wp_widget_factory'] = new WP_Widget_Factory();
/**
* WordPress User Roles
*
* @global WP_Roles $wp_roles
* @since 2.0.0
*/
$GLOBALS['wp_roles'] = new WP_Roles();
/**
* Fires before the theme is loaded.
*
* @since 2.6.0
*/
do_action( 'setup_theme' );
// Define the template related constants.
wp_templating_constants();
// Load the default text localization domain.
load_default_textdomain();
$locale = get_locale();
$locale_file = WP_LANG_DIR . "/$locale.php";
if ( ( 0 === validate_file( $locale ) ) && is_readable( $locale_file ) ) {
require( $locale_file );
}
unset( $locale_file );
/**
* WordPress Locale object for loading locale domain date and various strings.
*
* @global WP_Locale $wp_locale
* @since 2.1.0
*/
$GLOBALS['wp_locale'] = new WP_Locale();
/**
* WordPress Locale Switcher object for switching locales.
*
* @since 4.7.0
*
* @global WP_Locale_Switcher $wp_locale_switcher WordPress locale switcher object.
*/
$GLOBALS['wp_locale_switcher'] = new WP_Locale_Switcher();
$GLOBALS['wp_locale_switcher']->init();
// Load the functions for the active theme, for both parent and child theme if applicable.
foreach ( wp_get_active_and_valid_themes() as $theme ) {
if ( file_exists( $theme . '/functions.php' ) ) {
include $theme . '/functions.php';
}
}
unset( $theme );
/**
* Fires after the theme is loaded.
*
* @since 3.0.0
*/
do_action( 'after_setup_theme' );
// Set up current user.
$GLOBALS['wp']->init();
/**
* Fires after WordPress has finished loading but before any headers are sent.
*
* Most of WP is loaded at this stage, and the user is authenticated. WP continues
* to load on the {@see 'init'} hook that follows (e.g. widgets), and many plugins instantiate
* themselves on it for all sorts of reasons (e.g. they need a user, a taxonomy, etc.).
*
* If you wish to plug an action once WP is loaded, use the {@see 'wp_loaded'} hook below.
*
* @since 1.5.0
*/
do_action( 'init' );
// Check site status
if ( is_multisite() ) {
if ( true !== ( $file = ms_site_check() ) ) {
require( $file );
die();
}
unset( $file );
}
/**
* This hook is fired once WP, all plugins, and the theme are fully loaded and instantiated.
*
* Ajax requests should use wp-admin/admin-ajax.php. admin-ajax.php can handle requests for
* users not logged in.
*
* @link https://codex.wordpress.org/AJAX_in_Plugins
*
* @since 3.0.0
*/
do_action( 'wp_loaded' );
/*
* Store the fact that we could successfully execute the entire WordPress
* lifecycle. This is used to skip the premature shutdown handler, as it cannot
* be unregistered.
*/
if ( ! defined( 'WP_EXECUTION_SUCCEEDED' ) ) {
define( 'WP_EXECUTION_SUCCEEDED', true );
}
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