PHP 4 to 5
I have read in some forums about the concerns that PHP 5 might break old PHP 4 scripts. Like I said, I have been using PHP5 since Beta 2 and I haven’t had a problem. There are some issues however which some more obscure things that could go wrong. So in case anyone is interested you can read Zend’s Backwards Incompatible Changes.
Written by Colin Bate