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I'd bet that 99+% of the code written for PHP 4 will work with PHP 5. IIRC (I don't really work with PHP, just .NET--don't hate), the main things added to PHP 5 was some actual OOP constructs that made sense and some syntactic sugar. I'm probably horribly understating the platform upgrade, but still, your procedural code is probably all going to work just fine in PHP 5.
There might be some functions that are deprecated but they'll still "work". Long story short, it's probably just a matter of upgrading the version of PHP your server is running.
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