On what I call "functionception" (see comment)

functionception.php

<?php
/* Proper way to fix this: https://github.com/kriwil/OpenX/blob/6804041a8f74d80f6fae4df3320576cc3bba06ff/pre-check.php#L252
Note that phpversion is also implemented in PHP4, but couldn't find the correct minor in which it was added, but let's 
face it: If you're running PHP prior to 4.3, you're already doing a lot of wrong sh*t.

Also, can't find the correct minor on which function_exists was added, but it seems to begin working properly as of 4.3.0.
*/

if ((float)phpversion() >  4.3) {
}