php根据IP地址获取地理位置

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<?php
header("Content-type: text/html; charset=utf-8");
//获取IP地址的方法
function getIP(){
if (isset($_SERVER)) {
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$realip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} elseif (isset($_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");
} elseif (getenv("HTTP_CLIENT_IP")) {
$realip = getenv("HTTP_CLIENT_IP");
} else {
$realip = getenv("REMOTE_ADDR");
}
}
return $realip;
}

echo $ip = getIP();

//通过php的file_get_contents()方法获取地理位置
//新浪接口根据ip查询所在区域信息

$res0 = file_get_contents("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=$ip");
$res0 = json_decode($res0,true);
print_r($res0);
echo "<br/>";

//淘宝接口根据ip查询所在区域信息

$res1 = file_get_contents("http://ip.taobao.com/service/getIpInfo.php?ip=$ip");
$res1 = json_decode($res1,true);
print_r($res1);
echo "<br/>";


//通过php的curl获取地理位置
//新浪根据IP获取地理位置API

$url = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=$ip';
$ch = curl_init($url);
curl_setopt($ch,CURLOPT_ENCODING ,'utf8');
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) ; // 获取数据返回
$location = curl_exec($ch);
$location = json_decode($location);
print_r($location);
curl_close($ch);

$loc = "";
if($location===FALSE) return "";
if (empty($location->desc)) {
$loc = $location->province.$location->city.$location->district.$location->isp;
}else{
$loc = $location->desc;
}
echo $loc;


//腾讯根据IP获取地理位置API

$url = 'http://ip.qq.com/cgi-bin/searchip?searchip1=$ip';
$ch = curl_init($url);
curl_setopt($ch,CURLOPT_ENCODING ,'gb2312');
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) ; // 获取数据返回
$result = curl_exec($ch);
$result = mb_convert_encoding($result, "utf-8", "gb2312"); // 编码转换,否则乱码
curl_close($ch);
preg_match("@<span>(.*)</span></p>@iU",$result,$ipArray);
$loc = $ipArray[1];
echo $loc;