PHP 根據IP地址獲取所在城市

有這樣的需求，需要根據用戶的IP地址，定位用戶所在的城市。
本文記錄性文章，無邏輯性。有這樣需求的朋友，可以直接拷貝使用。直接上代碼，不需贅述。

<?php
header('Content-Type:text/html;Charset=utf-8');
function GetIp(){
 $realip = '';
 $unknown = 'unknown';
 if (isset($_SERVER)){




 if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_FOR'], $unknown)){
 $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
 foreach($arr as $ip){
 $ip = trim($ip);
 if ($ip != 'unknown'){
 $realip = $ip;
 break;
 }
 }
 }else if(isset($_SERVER['HTTP_CLIENT_IP']) && !empty($_SERVER['HTTP_CLIENT_IP']) && strcasecmp($_SERVER['HTTP_CLIENT_IP'], $unknown)){
 $realip = $_SERVER['HTTP_CLIENT_IP'];
 }else if(isset($_SERVER['REMOTE_ADDR']) && !empty($_SERVER['REMOTE_ADDR']) && strcasecmp($_SERVER['REMOTE_ADDR'], $unknown)){
 $realip = $_SERVER['REMOTE_ADDR'];
 }else{
 $realip = $unknown;
 }
 }else{
 if(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), $unknown)){
 $realip = getenv("HTTP_X_FORWARDED_FOR");
 }else if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), $unknown)){
 $realip = getenv("HTTP_CLIENT_IP");
 }else if(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), $unknown)){
 $realip = getenv("REMOTE_ADDR");
 }else{
 $realip = $unknown;
 }
 }
 $realip = preg_match("/[d.]{7,15}/", $realip, $matches) ? $matches[0] : $unknown;
 return $realip;
}
function GetIpLookup($ip = ''){
 if(empty($ip)){
 $ip = GetIp();
 }
 $res = @file_get_contents('http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=' . $ip);




 if(empty($res)){ return false; }
 $jsonMatches = array();
 preg_match('#{.+?}#', $res, $jsonMatches);
 if(!isset($jsonMatches[0])){ return false; }
 $json = json_decode($jsonMatches[0], true);
 if(isset($json['ret']) && $json['ret'] == 1){
 $json['ip'] = $ip;
 unset($json['ret']);
 }else{
 return false;
 }
 return $json;
}
$ipInfos = GetIpLookup('123.125.114.144'); //baidu.com IP地址
var_dump($ipInfos);

結果截圖：


使用了新浪的開放API，執行速度還是非常贊的。
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