检测是否是手机访问

/**
 * 检测是否是手机访问
 */
function is_mobile(){
    $useragent=isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
    $useragent_commentsblock=preg_match('|\(.*?\)|',$useragent,$matches)>0?$matches[0]:'';
    function _is_mobile($substrs,$text){
        foreach($substrs as $substr)
            if(false!==strpos($text,$substr)){
                return true;
            }
            return false;
    }
    $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');

    $found_mobile=_is_mobile($mobile_os_list,$useragent_commentsblock) ||
              _is_mobile($mobile_token_list,$useragent);
    if ($found_mobile){
        return true;
    }else{
        return false;
    }
}