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Detecting the browsing device

We can check the device that is used for browsing.
The following code detects if the browsing device is mobile.

 if (preg_match("/phone|iphone|itouch|ipod|symbian|android|htc_|htc-|palmos|blackberry|opera mini|iemobile|windows ce|nokia|fennec|hiptop|kindle|mot |mot-|webos\/|samsung|sonyericsson|^sie-|nintendo/", strtolower($_SERVER['HTTP_USER_AGENT']))) { 
//browsed from mobile device
}
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