On february 21st 2013, the PHP group has released PHP 5.3.22.
This releases fix about 10 bugs. Beside that, all users of PHP are encouraged to upgrade to PHP 5.4.12
The corresponding packages are now available on Dotdeb for Debian 6.0 “Squeeze” on both amd64 and i386 architectures. As usual, please read the ChangeLog before upgrading and be sure to use to the latest packages before reporting any issue.