The PHP group today has announced that PHP 5.3 is reaching its End of Life. Below is the post directly from php.net
The PHP development team announces the immediate availability of PHP 5.3.27. About 10 bugs were fixed, including a security fix in the XML parser (Bug #65236). Please Note: This will be the last regular release of the PHP 5.3 series. All users of PHP are encouraged to upgrade to PHP 5.4 or PHP 5.5. The PHP 5.3 series will receive only security fixes for the next year.
ASPnix supports both PHP 5.4 and 5.5 so you may test migrating your PHP 5.2 and 5.3 based websites to these newer versions of PHP at any time. We highly recommend that everyone at least look into upgrading their applications to one of the newer releases of PHP (especially if you still use PHP 5.2).
If you are unsure if your application supports these versions of PHP, please contact the developer.