PHP获取ip与ip所在城市

/**
* 获取用户真实 IP
*/
function getIP()
{
static $realip;
if (isset($_SERVER)){
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])){
$realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
} else if (isset($_SERVER["HTTP_CLIENT_IP"])) {
$realip = $_SERVER["HTTP_CLIENT_IP"];
} else {
$realip = $_SERVER["REMOTE_ADDR"];
}
} else {
if (getenv("HTTP_X_FORWARDED_FOR")){
$realip = getenv("HTTP_X_FORWARDED_FOR");
} else if (getenv("HTTP_CLIENT_IP")) {
$realip = getenv("HTTP_CLIENT_IP");
} else {
$realip = getenv("REMOTE_ADDR");
}
}
return $realip;
}

/**
* 获取 IP  地理位置
* 淘宝IP接口
* @Return: array
*/
function getCity($ip = '')
{
if($ip == ''){
$url = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json";
$ip=json_decode(file_get_contents($url),true);
$data = $ip;
}else{
$url="http://ip.taobao.com/service/getIpInfo.php?ip=".$ip;
$ip=json_decode(file_get_contents($url));
if((string)$ip->code=='1'){
return false;
}
$data = (array)$ip->data;
}

return $data;
}

var_dump(getIP());
var_dump(getCity());
var_dump(getCity('218.93.250.162'));

string(3) "::1"
array(10) {
["ret"]=>
int(1)
["start"]=>
int(-1)
["end"]=>
int(-1)
["country"]=>
string(6) "中国"
["province"]=>
string(6) "江苏"
["city"]=>
string(6) "宿迁"
["district"]=>
string(0) ""
["isp"]=>
string(0) ""
["type"]=>
string(0) ""
["desc"]=>
string(0) ""
}
array(13) {
["country"]=>
string(6) "中国"
["country_id"]=>
string(2) "CN"
["area"]=>
string(6) "华东"
["area_id"]=>
string(6) "300000"
["region"]=>
string(9) "江苏省"
["region_id"]=>
string(6) "320000"
["city"]=>
string(9) "宿迁市"
["city_id"]=>
string(6) "321300"
["county"]=>
string(0) ""
["county_id"]=>
string(2) "-1"
["isp"]=>
string(6) "电信"
["isp_id"]=>
string(6) "100017"
["ip"]=>
string(14) "218.93.250.162"
}