[PHP]사용자 브라우저 정보

$userAgent = $_SERVER["HTTP_USER_AGENT"]; 
        
        if(preg_match('/MSIE/i',$userAgent) && !preg_match('/Opera/i',$u_agent)){
            $browser = 'Internet Explorer';
        }
        else if(preg_match('/Firefox/i',$userAgent)){
            $browser = 'Mozilla Firefox';
        }
        else if (preg_match('/Chrome/i',$userAgent)){
            $browser = 'Google Chrome';
        }
        else if(preg_match('/Safari/i',$userAgent)){
            $browser = 'Apple Safari';
        }
        elseif(preg_match('/Opera/i',$userAgent)){
            $browser = 'Opera';
        }
        elseif(preg_match('/Netscape/i',$userAgent)){
            $browser = 'Netscape';
        }
        elseif(preg_match('/Whale/i',$userAgent)){
            $browser = 'Whale';
        }
        else{
            $browser = "Other";
        }