［转自］http://hi.baidu.com/xiamishule/blog/item/dea92c09ef9acc9e0b7b8236.html
源代码：
PHP获取IP的方法有许多种，<br />今天向大家总结了六种方法。
<br />PHP获取IP方法一：
<?php
function GetIP() {
if(!empty($_SERVER["HTTP_CLIENT_IP"]))
$cip = $_SERVER["HTTP_CLIENT_IP"];
else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
$cip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if(!empty($_SERVER["REMOTE_ADDR"]))
$cip = $_SERVER["REMOTE_ADDR"];
else
$cip = "无法获取！";
return $cip;
}
echo GetIP();
?>
<br />PHP获取IP方法二：
<?
error_reporting (E_ERROR | E_WARNING | E_PARSE);
if($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]){
$ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];
}
elseif($HTTP_SERVER_VARS["HTTP_CLIENT_IP"]){
$ip = $HTTP_SERVER_VARS["HTTP_CLIENT_IP"];
}
elseif ($HTTP_SERVER_VARS["REMOTE_ADDR"]){
$ip = $HTTP_SERVER_VARS["REMOTE_ADDR"];
}
elseif (getenv("HTTP_X_FORWARDED_FOR")){
$ip = getenv("HTTP_X_FORWARDED_FOR");
}
elseif (getenv("HTTP_CLIENT_IP")){
$ip = getenv("HTTP_CLIENT_IP");
}
elseif (getenv("REMOTE_ADDR")){
$ip = getenv("REMOTE_ADDR");
}
else{
$ip = "Unknown";
}
echo $ip;
?>
<br />PHP获取IP方法三：
<? $iipp = $_SERVER["REMOTE_ADDR"]; echo $iipp; ?>
<br />PHP获取IP方法四：
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从HTML文件中读取指定字符串
原贴地址：http://topic.csdn.net/u/20100322/10/d7401c38-10b7-4231-a323-454caf946fa6.html
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