Simplest way to detect a mobile device in PHP

Question

What is the simplest way to tell if a user is using a mobile device to browse my site using PHP?

I have come across many classes that you can use but I was hoping fo

Answer 1

function isMobileDev(){
    if(isset($_SERVER['HTTP_USER_AGENT']) and !empty($_SERVER['HTTP_USER_AGENT'])){
       $user_ag = $_SERVER['HTTP_USER_AGENT'];
       if(preg_match('/(Mobile|Android|Tablet|GoBrowser|[0-9]x[0-9]*|uZardWeb\/|Mini|Doris\/|Skyfire\/|iPhone|Fennec\/|Maemo|Iris\/|CLDC\-|Mobi\/)/uis',$user_ag)){
          return true;
       };
    };
    return false;
}