<?php // PHP 5.3 minimum if (version_compare(PHP_VERSION, '5.3.3', '<')) { die('This software require PHP 5.3.3 minimum'); } // Short tags must be enabled for PHP < 5.4 if (version_compare(PHP_VERSION, '5.4.0', '<')) { if (! ini_get('short_open_tag')) { die('This software require to have short tags enabled, check your php.ini => "short_open_tag = On"'); } }