PHP判斷當前頁面是電腦登錄，還是手機登錄

//判斷是否是電腦登錄，還是手機登錄
    public function isMobil()
    {
        $useragent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
        $useragent_commentsblock = preg_match('|\(.*?\)|', $useragent, $matches) > 0 ? $matches[0] : '';
        $mobile_os_list = array
        (
            'Google Wireless Transcoder',
            'Windows CE',
            'WindowsCE',
            'Symbian',
            'Android',
            'armv6l',
            'armv5',
            'Mobile',
            'CentOS',
            'mowser',
            'AvantGo',
            'Opera Mobi',
            'J2ME/MIDP',
            'Smartphone',
            'Go.Web',
            'Palm',
            'iPAQ'
        );
        $mobile_token_list = array
        (
            'Profile/MIDP',
            'Configuration/CLDC-',
            '160×160',
            '176×220',
            '240×240',
            '240×320',
            '320×240',
            'UP.Browser',
            'UP.Link',
            'SymbianOS',
            'PalmOS',
            'PocketPC',
            'SonyEricsson',
            'Nokia',
            'BlackBerry',
            'Vodafone','BenQ',
            'Novarra-Vision',
            'Iris',
            'NetFront',
            'HTC_',
            'Xda_',
            'SAMSUNG-SGH',
            'Wapaka',
            'DoCoMo',
            'iPhone',
            'iPod'
        );
        $found_mobile = $this->CheckSubstrs($mobile_os_list, $useragent_commentsblock) ||
        $this->CheckSubstrs($mobile_token_list, $useragent);
        if ($found_mobile)
        {
            echo '手機登錄';
        }
        else
        {
            echo '電腦登錄';
        }
    }