<?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 $json; ?} ?$ip = GetIp(); $ipInfos = GetIpLookup($ip); //baidu.com IP地址 ??
PHP 根据IP地址获取所在城市
原文地址：http://www.cnblogs.com/Abner3721/p/8026802.html