เช็ค ประเทศจาก IP Address (Getting country , city name from IP address in PHP)

$ip = $_SERVER['REMOTE_ADDR'];

    function countryCityFromIP($ipAddr)
    {
    //function to find country and city from IP address
    //Developed by Roshan Bhattarai <a href="http://roshanbh.com.np">http://roshanbh.com.np</a>
    //verify the IP address for the
    ip2long($ipAddr)== -1 || ip2long($ipAddr) === false ? trigger_error("Invalid IP", E_USER_ERROR) : "";
    $ipDetail=array(); //initialize a blank array
    //get the XML result from hostip.info
    $xml = file_get_contents("http://api.hostip.info/?ip=".$ipAddr);
    //get the city name inside the node <gml:name> and </gml:name>
    preg_match("@<Hostip>(\s)*<gml:name>(.*?)</gml:name>@si",$xml,$match);
    //assing the city name to the array
    $ipDetail['city']=$match[2];
    //get the country name inside the node <countryName> and </countryName>
    preg_match("@<countryName>(.*?)</countryName>@si",$xml,$matches);
    //assign the country name to the $ipDetail array
    $ipDetail['country']=$matches[1];
    //get the country name inside the node <countryName> and </countryName>
    preg_match("@<countryAbbrev>(.*?)</countryAbbrev>@si",$xml,$cc_match);
    $ipDetail['country_code']=$cc_match[1]; //assing the country code to array
    //return the array containing city, country and country code
    return $ipDetail;
    }
$IPDetail=countryCityFromIP($ip);
echo $IPDetail['country']; //country of that IP address
echo $IPDetail['city']; //outputs the IP detail of the city