From 3c68f38fdaec7a6f81f986a639bdd29716cf8f22 Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Wed, 2 Dec 2020 17:47:33 +0100
Subject: Restrict allowed usages of $GLOBALS

This restricts allowed usage of $GLOBALS, with the effect that
plain PHP arrays can no longer contain INDIRECT elements.

RFC: https://wiki.php.net/rfc/restrict_globals_usage

Closes GH-6487.
---
 UPGRADING | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'UPGRADING')

diff --git a/UPGRADING b/UPGRADING
index 38dfda996a..f3d155d4f1 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -19,6 +19,15 @@ PHP 8.1 UPGRADE NOTES
 1. Backward Incompatible Changes
 ========================================
 
+- Core:
+  . Access to the $GLOBALS array is now subject to a number of restrictions.
+    Read and write access to individual array elements like $GLOBALS['var']
+    continues to work as-is. Read-only access to the entire $GLOBALS array also
+    continues to be supported. However, write access to the entire $GLOBALS
+    array is no longer supported. For example, array_pop($GLOBALS) will result
+    in an error.
+    RFC: https://wiki.php.net/rfc/restrict_globals_usage
+
 - Fileinfo:
   . The fileinfo functions now accept and return, respectively, finfo objects
     instead of resources.
-- 
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