[TOC]
```
//获取ip(1)
function getClientIP()
{
if (isset($_SERVER)) {
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
$realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
} else
if (isset($_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");
} else
if (getenv("HTTP_CLIENT_IP")) {
$realip = getenv("HTTP_CLIENT_IP");
} else {
$realip = getenv("REMOTE_ADDR");
}
}
return addslashes($realip);
}
//获取ip(2)
function getClientIp2()
{
$ip = 'unknown';
$unknown = 'unknown';
if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] && strcasecmp($_SERVER['HTTP_X_FORWARDED_FOR'], $unknown)) {
// 使用透明代理、欺骗性代理的情况
$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} elseif (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], $unknown)) {
// 没有代理、使用普通匿名代理和高匿代理的情况
$ip = $_SERVER['REMOTE_ADDR'];
}
// 处理多层代理的情况
if (strpos($ip, ',') !== false) {
// 输出第一个IP
$ip = reset(explode(',', $ip));
}
return $ip;
}
//获取IP(3)
function get_ip_address()
{
foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key)
{
if (array_key_exists($key, $_SERVER) === true)
{
foreach (explode(',', $_SERVER[$key]) as $ip)
{
$ip = trim($ip);
if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) !== false)
{
return $ip;
}
}
}
}
}
```
