For example could PHP check if had been compiled with the GD or SQL libraries... or check if a MySQL database exists on the server (of even if a MySQL server exists on the host) ?
I can check if classes exist now which is good, and very helpful, but the stuff listed above I have no idea about (even though I've been using PHP for about 2 and a half years)
I'm taking a wild guess I've just made myself look really stupid.
Right......... I'm off to beat myself with a large stick.