All Unix / Linux installations come with Perl installed. I don't think they come with PHP installed as PHP is only useful in its narrow niche of writing dynamic web-pages (and there we all agree that mixing code and HTML is a Bad Thing) and PErl has a much larger audience.

In a few years there will still be a lot of Perl programmers around, but see if you can find someone who can still program in that particular version of PHP that was the hype when the page was written.