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Yeah, I was going to say "of course you can run multiple versions of PHP on your system. Just go read the documentation."
The reason is that there are quite a few differences in PHP5 and PHP4 that make it to where it would break scripts if switching directly to 5. They actually recommend running multiple versions until you get all of your quirks ironed out. Too, you can have some scripts call 5 and some scripts call 4. It all depends on your system resources too though, and you have to keep those in mind while using it on a production system.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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