thinkphp 通过ip获取真实地址 取巧方法

function getipinfo(){
    header("Content-Type:text/html;   charset=utf-8");
    $url = 'http://1111.ip138.com/ic.asp';  //这儿填页面地址
    $info=httpGet($url);
    $p = "%(.*?)%si";
    preg_match_all($p, $info, $arr);
    
    $info=$arr[1];
    $str1 = explode("[",iconv('GB2312', 'UTF-8',$info[0]));
    $str2 = explode("]",$str1[1]);
    $ip=$str2[0].'_'.substr($str2[1],10);
    return $ip;
 }