PHP 5.4.21 Release Announcement
The PHP development team announces the immediate availability of PHP
5.4.21. About 10 bugs were fixed. All PHP 5.4 users are encouraged to upgrade to this version.
For source downloads of PHP 5.4.21 please visit our downloads page,
Windows binaries can be found on windows.php.net/download/.
The list of changes is recorded in the ChangeLog.