How to detect the request is comes from mobile?

PHP
1

Hi
i want to detect the mobile and web ,how to do can anyone give me a suggestion, now i used detect mobile browser but it not worked.

2

Check out $_SERVER[‘HTTP_USER_AGENT’]

if(strstr($_SERVER['HTTP_USER_AGENT'],'iPhone') == true) {
	// this is an iPhone
}
3

And if you really want to drive yourself nuts:
Mobile Browser ID Strings (a.k.a. User Agent ID)

4

Thank you for all