Update to PHP 5.4

[Ginger9909]

Thank you so much guys.
Yes, my hosting provider is hostgator, and I followed their steps to test the site with PHP 5.4, but it appeared not compatible, so I came back to PHP 5.2.
I don't know much about programming. I hope the upgrade won't affect my website much. I'll investigate further. Thank you both for the explanations.

I'm also I'm the same situation. I had done the update and got the 500 error so I switched back to,5.2 and my site worked again. I called hostgator the next day and she said zencart wasn't compatible with 5.4 and switched me to 5.3 which worked. She told me to get some plug in or something from zencart. This is all confusing to me. If I stay with 5.3 would that be ok or do I have to go with 5.4 eventually.