cretaceous;10989159 wrote:is there anything else I should look for?!
Probably. A lot changed between PHP4 and PHP5... tons of new functionality was added, older functionality that had fallen out of good coding practices ages ago were finally "officially" deprecated, etc.
Best advice I can offer is to enable your error logging (something you should already have anyway) and set error_reporting to E_ALL | E_STRICT and watch for any and all errors/warnings/etc. PHP might be generating.
EDIT: Also note that the use of the "<?" and "<?=" short tags has nothing to do whether you're using PHP4 or PHP5; the syntax is available in both versions. However, if you're already working on fixing it then my advise is to continue doing so; I personally always disable short tags on all of my servers and always advise against ever using them.