You can also do the check from within your Zen-cart admin interface: Tools->Server version/info.

Some more info that may be useful:
- What PHP version is on your server?
- The value of DIR_FS_CATALOG in the configure.php file in your <admin>/includes folder. This should be the file path on your server, to your zen-cart files, ending with a slash.

I really cannot think of anything not being compatible, as only standard PHP functions are used, which I believe were already supported in earlier versions of PHP. But one can never know.....