PHP.net also has a tonne of mirror sites; just because uk2.php.net (Camel Network) may be down doesn't mean uk.php.net (Kewlio.net Ltd) must be as well, or any of the four US mirrors, or two Australian, or two NZ, or two Indian, or two French, or three German, or .... oh, here's what I pulled off their list of mirrors:
And if you want to download a complete copy of the manual for yourself and use that for a reference, php.net supplies it that way in a bunch of formats as well.