php curl 太强大了，它不但可以模仿用户登录，还可以模仿用户IP地址哦，为伪造IP来源，本实例仅供参考哦

curl发出请求的文件fake_ip.php:
代码

 
<?php 
$ch = curl_init(); 
$url = "http://localhost/target_ip.php"; 
$header = array( 
'CLIENT-IP:58.68.44.61', 
'X-FORWARDED-FOR:58.68.44.61', 
); 
curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_HTTPHEADER, $header); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true); 
$page_content = curl_exec($ch); 
curl_close($ch); 
echo $page_content; 
?> 

请求的目标文件target_ip.php:

 
<?php 
echo getenv('HTTP_CLIENT_IP'); 
echo getenv('HTTP_X_FORWARDED_FOR'); 
echo getenv('REMOTE_ADDR'); 
?> 

目标文件target_ip里面的IP打印顺序是目前很多开源系统的IP获取顺序
访问fake_ip.php,看到结果:
58.68.44.61
58.68.44.61
127.0.0.1
实例
CURL确实很强悍，可以伪造IP和来源。
1.php 请求 2.php 。

1.php代码：

 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, "http://localhost/2.php"); 
curl_setopt($ch, CURLOPT_HTTPHEADER, array('X-FORWARDED-FOR:8.8.8.8', 'CLIENT-IP:8.8.8.8')); //构造IP 
curl_setopt($ch, CURLOPT_REFERER, "http://www.jb51.net/ "); //构造来路 
curl_setopt($ch, CURLOPT_HEADER, 1); 
$out = curl_exec($ch); 
curl_close($ch); 

2.php代码如下：

 
function getClientIp() { 
if (!empty($_SERVER["HTTP_CLIENT_IP"])) 
$ip = $_SERVER["HTTP_CLIENT_IP"]; 
else if (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) 
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"]; 
else if (!empty($_SERVER["REMOTE_ADDR"])) 
$ip = $_SERVER["REMOTE_ADDR"]; 
else 
$ip = "err"; 
return $ip; 
} 
echo "IP: " . getClientIp() . ""; 
echo "referer: " . $_SERVER["HTTP_REFERER"]; 

伪造成功，这是不是给“刷票”的朋友提供了很好的换IP的方案