Upgrading from PHP 4.X to 5.2.14 -Will ZC 3.7, 3.8A, and 3.9 versions & mods work?

[Donn]

Hi Zen Cart peoples....

I recently became aware of an option to upgrade my hosting account from 4.X to 5.2.14. The condition is, once I upgrade, I cannot undo the change.

I have a few carts...one is a 1.3.7, another a 1.3.8A, and a couple of 1.3.9H carts, with many mods from this site.

Will anything reportedly NOT work with the upgrade?

I'm guessing that the newest carts, 1.3.9H, will be OK (though I did have to make a few changes to get them to even work on the older PHP version-- http://www.zen-cart.com/forum/showthread.php?t=167121 and other posts) but the older versions are the ones that I'm concerned about.

The only reason I even want to upgrade is that there are WordPress and PHPBB3 mods that require it. How about for ZC? Do any mods *require* newer PHP?

Thanks...