From ac095904da5676665d896a18b8f9659e63c152f4 Mon Sep 17 00:00:00 2001
From: desrosj <desrosj@git.wordpress.org>
Date: Wed, 15 May 2019 18:19:51 +0000
Subject: [PATCH] Bootstrap/Load: Prevent PHP errors when a drop-in triggers
 fatal error protection.

When a drop-in (such as `advanced-cache.php`) contains a PHP error, additional PHP errors are caused when displaying the error protection screen because `load_default_textdomain()` and `WP_Error` are not yet available.

Though recovery mode is not supported for `mu-plugins` and drop-ins, fatal error protection is. This change ensures the error screen is displayed when a fatal error is encountered within a drop-in and not a white screen.

Props TimothyBlynJacobs, spacedmonkey, daxelrod.
Fixes #47265.
Built from https://develop.svn.wordpress.org/trunk@45311


git-svn-id: http://core.svn.wordpress.org/trunk@45122 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/class-wp-fatal-error-handler.php | 6 +++++-
 wp-includes/version.php                      | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/wp-includes/class-wp-fatal-error-handler.php b/wp-includes/class-wp-fatal-error-handler.php
index 96958d10de..f17011cc33 100644
--- a/wp-includes/class-wp-fatal-error-handler.php
+++ b/wp-includes/class-wp-fatal-error-handler.php
@@ -37,7 +37,7 @@ class WP_Fatal_Error_Handler {
 				return;
 			}
 
-			if ( ! isset( $GLOBALS['wp_locale'] ) ) {
+			if ( ! isset( $GLOBALS['wp_locale'] ) && function_exists( 'load_default_textdomain' ) ) {
 				load_default_textdomain();
 			}
 
@@ -165,6 +165,10 @@ class WP_Fatal_Error_Handler {
 			require_once ABSPATH . WPINC . '/functions.php';
 		}
 
+		if ( ! class_exists( 'WP_Error' ) ) {
+			require_once ABSPATH . WPINC . '/class-wp-error.php';
+		}
+
 		if ( is_protected_endpoint() ) {
 			$message = __( 'The site is experiencing technical difficulties. Please check your site admin email inbox for instructions.' );
 		} else {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3bd5e26b34..b0d50d95f5 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45310';
+$wp_version = '5.3-alpha-45311';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.