Am 15.10.2012 um 17:09 schrieb SilverTip257:
It might not be _as_ bad as you think.
We made the push to php5.3 on a few web hosts and I got the fun job of fixing some old code for customer CMSes. Tail the site/vhost's error_log and fix the broken items. Once I took care of a few sites, I had a pretty comprehensive list that made further sites easy.
If you're adventurous, I could toss you a quick list of common items that need fixed.
http://php.net/manual/en/migration53.php
-- LF