51 lines
1.6 KiB
PHP
Executable File
51 lines
1.6 KiB
PHP
Executable File
<?php
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/**
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* 获得用户的真实IP地址
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* <br />来源：ecshop
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* <br />$_SERVER和getenv的区别，getenv不支持IIS的isapi方式运行的php
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* @access public
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* @return string
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*/
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function real_ip()
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{
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static $realip = NULL;
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if ($realip !== NULL) {
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return $realip;
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}
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if (isset($_SERVER)) {
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if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
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$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
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/* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
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foreach ($arr as $ip) {
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$ip = trim($ip);
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if ($ip != 'unknown') {
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$realip = $ip;
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break;
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}
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}
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} elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
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$realip = $_SERVER['HTTP_CLIENT_IP'];
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} else {
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if (isset($_SERVER['REMOTE_ADDR'])) {
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$realip = $_SERVER['REMOTE_ADDR'];
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} else {
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$realip = '0.0.0.0';
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}
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}
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} else {
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if (getenv('HTTP_X_FORWARDED_FOR')) {
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$realip = getenv('HTTP_X_FORWARDED_FOR');
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} elseif (getenv('HTTP_CLIENT_IP')) {
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$realip = getenv('HTTP_CLIENT_IP');
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} else {
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$realip = getenv('REMOTE_ADDR');
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}
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}
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// 使用正则验证IP地址的有效性，防止伪造IP地址进行SQL注入攻击
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preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
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$realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';
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return $realip;
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} |