Simple example of php curl forging IP

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://localhost/index.php");
$r = rand(1,255);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('X-FORWARDED-FOR:8.8.8.'.$r, 'CLIENT-IP:125.8.8.'.$r));  //构造IP
curl_setopt($ch, CURLOPT_REFERER, "http://bbs.it-home.org");   //构造来路
curl_setopt($ch, CURLOPT_HEADER, 0);   // 0 不输出 ， 1 输出
$out = curl_exec($ch);
curl_close($ch);
?>

2，php伪造ip地址信息 index.php

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"];
?>