PHP determines whether the client is PC or mobile phone

The code function of this article is to use PHP to determine whether the client is a PC or a mobile phone. It has certain reference value and interested friends can learn about it.

function is_mobile(){
        $agent = strtolower($_SERVER['HTTP_USER_AGENT']);
        $is_pc = (strpos($agent, 'windows nt')) ? true : false;
        $is_mac = (strpos($agent, 'mac os')) ? true : false;
        $is_iphone = (strpos($agent, 'iphone')) ? true : false;
        $is_android = (strpos($agent, 'android')) ? true : false;
        $is_ipad = (strpos($agent, 'ipad')) ? true : false;        
        if($is_pc){              
        return  false;
        }        
        if($is_mac){              
        return  true;
        }        
        if($is_iphone){              
        return  true;
        }        
        if($is_android){              
        return  true;
        }        
        if($is_ipad){              
        return  true;
        }
}

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