有这样的需求，需要根据用户的IP地址，定位用户所在的城市。
本文记录性文章，无逻辑性。有这样需求的朋友，可以直接拷贝使用。直接上代码，不需赘述。
<?phpheader ('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);
使用了新浪的开放API，执行速度还是非常赞的。
