Have you ever tried switching PHP version for a single website if you hosted multiple websites in a hosting?. Using .htaccess you can easily switch PHP version from 5.2 to 5.3.
Add this line in your .htaccess file to change PHP 5.2 to PHP 5.3:
AddHandler application/x-httpd-php53 .php
If you are already using newer version ie., PHP 5.3, you can always downgrade with the same technique:
From PHP 5.3 to PHP 5.2:
AddHandler application/x-httpd-php52 .php
Enjoy coding!