Commit 278d290410b for php.net

commit 278d290410b022c2abd5b875bbd65d30b1b53c76
Author: Weilin Du <weilindu@php.net>
Date:   Sun Aug 30 00:06:58 2026 +0800

    [skip ci] UPGRADING: Add entry for #23460

diff --git a/UPGRADING b/UPGRADING
index 78074404b40..74ecf90408a 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -940,6 +940,9 @@ PHP 8.6 UPGRADE NOTES
   . Made splitText() faster and consume less memory.

 - GD:
+  . imagebmp(), imagewbmp(), imagegd(), and imagegd2() now buffer output when
+    writing to PHP streams, significantly improving performance when writing
+    images to files.
   . Improved performance of imagegrabscreen() and imagegrabwindow() on
     Windows.