I'm not entirely sure if I use many PHP5 functions, because vB4 requires PHP5 and as such I didn't think too much about what functions I used.
The odds of scripts breaking from PHP4 -> PHP5 is very small, though, and for the most part they can be hid via error_reporting() changes.
Rolling back PHP isn't much more difficult than upgrading, so I would suggest you upgrade and if you start having problems, you can roll back.
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