I'm not sure but I think PHP runs on MacOS X only in the MacOS family.
What kind of Linux distribution is it ?
That is correct.
Back-porting to "old" MacOS would be a nightmare beyond human endeavor.
MacOS X is essentially two BSD's (FreeBSD and, errr, some other BSD) mixed together, I think.
There's a very low-volume "AMP (Apache/MySQL/PHP) mailing list hosted at dynapolis.com for Mac OS X users of A/M/P if anybody is interested in picking up on this intriguing marriage.
I guess MAMP (a la LAMP) just didn't cut it as an acronym... Maybe XAMP? Hmmm, well, now we all know why I'm a programmer and not in Marketing, eh?
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