PHP mobile browser detection?

Question

I\'m in need of a way to detect mobile browsers server-side. I\'d like a way that requires me to do little to set up and little to maintain, yet still provide me with accura

Answer 1

I once used to store temporarily visitors' ip-addresses and csrf-session values (meant to count current visitors).

And I noticed that I had a side-gain of being able to see if the visitor used a mobile or a PC: The csrf of a mobile changes with every new page load, a PC doesn't; and the ip-addresses remain in both cases.

Sure, you only detect a mobile if a visitor clicks twice and I have not checked how reliable this is (as I do not really need it), but it is php/server-side only.