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As already mentioned, almost anything written halfway decently for PHP4 (Using superglobals, very primitive OOP, if at all, not relying on inherited variables) will work fine with PHP5 up through 5.1.x.
They've decided to do some rather stupid shit since like killing the only sane regex library in 6.x, so you may get a few deprecation warnings, but you probably won't need to worry until at least 2011 for that.
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