php网站防止刷流量攻击方法

流量攻击是一种比较初级的网站攻击方法,就是不停的去刷样网站,导致服务器处理不过来或数据库负载不了,导致网站无法正常方法的一种攻击手段了,下面我来介绍一个利用php防网站刷流量攻击方法.

php网站防止刷流量攻击方法实例代码如下:

<?php
//查询禁止IP
$ip = $_SERVER[&#39;REMOTE_ADDR&#39;];
$fileht = ".htaccess2";
if (!file_exists($fileht)) file_put_contents($fileht, "");
$filehtarr = @file($fileht);
if (in_array($ip . "rn", $filehtarr)) die("Warning:" . "<br>" . "Your IP address are forbided by some reason, IF you have any question Pls emill to shop@mydalle.com!");
//加入禁止IP
$time = time();
$fileforbid = "log/forbidchk.dat";
if (file_exists($fileforbid)) {
    if ($time - filemtime($fileforbid) > 60) unlink($fileforbid);
    else {
        $fileforbidarr = @file($fileforbid);
        if ($ip == substr($fileforbidarr[0], 0, strlen($ip))) {
            if ($time - substr($fileforbidarr[1], 0, strlen($time)) > 600) unlink($fileforbid);
            elseif ($fileforbidarr[2] > 600) {
                file_put_contents($fileht, $ip . "rn", FILE_APPEND);
                unlink($fileforbid);
            } else {
                $fileforbidarr[2]++;
                file_put_contents($fileforbid, $fileforbidarr);
            }
        }
    }
}
//防刷新
$str = "";
$file = "log/ipdate.dat";
if (!file_exists("log") && !is_dir("log")) mkdir("log", 0777);
if (!file_exists($file)) file_put_contents($file, "");
$allowTime = 120; //防刷新时间
$allowNum = 10; //防刷新次数
$uri = $_SERVER[&#39;REQUEST_URI&#39;];
$checkip = md5($ip);
$checkuri = md5($uri);
$yesno = true;
$ipdate = @file($file);
foreach ($ipdate as $k => $v) {
    $iptem = substr($v, 0, 32);
    $uritem = substr($v, 32, 32);
    $timetem = substr($v, 64, 10);
    $numtem = substr($v, 74);
    if ($time - $timetem < $allowTime) {
        if ($iptem != $checkip) $str.= $v;
        else {
            $yesno = false;
            if ($uritem != $checkuri) $str.= $iptem . $checkuri . $time . "1rn";
            elseif ($numtem < $allowNum) $str.= $iptem . $uritem . $timetem . ($numtem + 1) . "rn";
            else {
                if (!file_exists($fileforbid)) {
                    $addforbidarr = array(
                        $ip . "rn",
                        time() . "rn",
                        1
                    );
                    file_put_contents($fileforbid, $addforbidarr);
                }
                file_put_contents("log/forbided_ip.log", $ip . "--" . date("Y-m-d H:i:s", time()) . "--" . $uri . "rn", FILE_APPEND);
                $timepass = $timetem + $allowTime - $time;
                die("Warning:" . "<br>" . "Sorry,you are forbided by refreshing frequently too much, Pls wait for " . $timepass . " seconds to continue!");
            } //开源代码phprm.com
            
        }
    }
}
if ($yesno) $str.= $checkip . $checkuri . $time . "1rn";
file_put_contents($file, $str);
?>

利用session 跟踪防post提交,代码如下:

<?php
session_start();
$clean = array();
$email_pattern = &#39;/^[^@s<&>]+@([-a-z0-9]+.)+[a-z]{2,}$/i&#39;;
if (preg_match($email_pattern, $_POST[&#39;email&#39;])) {
    $clean[&#39;email&#39;] = $_POST[&#39;email&#39;];
    $user = $_SESSION[&#39;user&#39;];
    $new_password = md5(uniqid(rand() , TRUE));
    if ($_SESSION[&#39;verified&#39;]) {
        /* Update Password */
        mail($clean[&#39;email&#39;], &#39;Your New Password&#39;, $new_password);
    }
}
?>