I am using zencart 1.3.9h and currently php version is 4.4.9 - I know it should be php5 but my ex who set up the site and forum originally said the mods would not work on php5 (he often made excuses so he did not have to do stuff!!).

Anyway, I am updating my smf forum and this will work on php4 or 5 and my webhosts currently have my server on php4 at my ex's request, but they have no problem updating this to php5.

My question is, is there a way I can check that my site will work ok on php5? I dont know much about zencart/php so have no idea how to check and am worried I tell my webhosts to change to php5 and then find my zencart store no longer works.

I have a few smaller websites but these are all dreamweaver/basic html (non shopping cart) information sites so I assume they would work on either version, but it's the main zencart one that concerns me.

Any help appreciated.