为你的页面加密访问，来实现加密访问你的加密页面或文章等等的页面。
<?php
/********************************************
* 使用方法:
*
* 1、将本段代码保存为 MkEncrypt.php
*
* 2、在要加密的页面前面引入这个 php 文件
* require_once('MkEncrypt.php');
*
* 3、设置页面访问密码
* MkEncrypt('页面密码');
*
********************************************/
// 密码 Cookie 加密盐
if(!defined('MK_ENCRYPT_SALT'))
define('MK_ENCRYPT_SALT', 'Kgs$JC!V');
/**
* 设置访问密码
*
* @param $password 访问密码
* @param $pageid 页面唯一 ID 值，用于区分同一网站的不同加密页面
*/
function MkEncrypt($password, $pageid = 'default') {
$pageid = md5($pageid);
$md5pw = md5(md5($password).MK_ENCRYPT_SALT);
$postpwd = isset($_POST['pagepwd']) ? addslashes(trim($_POST['pagepwd'])) : '';
$cookiepwd = isset($_COOKIE['mk_encrypt_'.$pageid]) ? addslashes(trim($_COOKIE['mk_encrypt_'.$pageid])) : '';
if($cookiepwd == $md5pw) return; // Cookie密码验证正确
if($postpwd == $password) { // 提交的密码正确
setcookie('mk_encrypt_' . $pageid, $md5pw, time() + 3600000, '/');
return;
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<meta name="author" content="mengkun">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>该页面已被加密</title>
<style type="text/css">
*{font-family:"Microsoft Yahei",微软雅黑,"Helvetica Neue",Helvetica,"Hiragino Sans GB","WenQuanYi Micro Hei",sans-serif;box-sizing:border-box;margin:0px;padding:0px;font-size:14px;-webkit-transition:.2s;-moz-transition:.2s;-ms-transition:.2s;-o-transition:.2s;transition:.2s}
html,body{width:100%;height:100%}
body{background-color:#F4F6F9;color:#768093}
input,button{font-size:1em;border-radius:3px;-webkit-appearance:none}
input{width:100%;padding:5px;box-sizing:border-box;border:1px solid #e5e9ef;background-color:#f4f5f7;resize:vertical}
input:focus{background-color:#fff;outline:none}
button{border:0;background:#6abd09;color:#fff;cursor:pointer;opacity:1;user-select:none}
button:hover,button:focus{opacity:.9}
button:active{opacity:1}
.main{width:100%;max-width:500px;height:300px;padding:30px;background-color:#fff;border-radius:2px;box-shadow:0 10px 60px 0 rgba(29,29,31,0.09);transition:all .12s ease-out;position:absolute;left:0;top:0;bottom:0;right:0;margin:auto;text-align:center}
.alert{width:80px}
.mk-side-form{margin-bottom:28px}
.mk-side-form input{float:left;padding:2px 10px;width:77%;height:37px;border:1px solid #ebebeb;border-right-color:transparent;border-radius:2px 0 0 2px;line-height:37px}
.mk-side-form button{position:relative;overflow:visible;width:23%;height:37px;border-radius:0 2px 2px 0;text-transform:uppercase}
.pw-tip{font-weight:normal;font-size:26px;text-align:center;margin:25px auto}
#pw-error {color: red;margin-top: 15px;margin-bottom: -20px;}
.return-home{text-decoration:none;color:#b1b1b1;font-size:16px}
.return-home:hover{color:#1E9FFF;letter-spacing:5px}
</style>
</head>
<body>
<div class="main">
<svg class="alert" viewBox="0 0 1084 1024" xmlns="http://www.w3.org/2000/svg" 80" 80">
<defs><style/></defs>
<path d="M1060.744 895.036L590.547 80.656a55.959 55.959 0 0 0-96.919 0L22.588 896.662a55.959 55.959 0 0 0 48.43 83.907h942.14a55.959 55.959 0 0 0 47.525-85.534zm-470.619-85.172a48.008 48.008 0 1 1-96.015 0v-1.567a48.008 48.008 0 1 1 96.015 0v1.567zm0-175.345a48.008 48.008 0 1 1-96.015 0V379.362a48.008 48.008 0 1 1 96.015 0v255.157z" fill="#FF9800"/>
</svg>
<form action="" method="post" class="mk-side-form">
<h2 class="pw-tip">该页面已被加密</h2>
<input type="password" name="pagepwd" placeholder="请输入访问密码查看" required><button type="submit">提交</button>
<?php if($postpwd): ?>
<p id="pw-error">Oops!密码不对哦~</p>
<script>setTimeout(function() {document.getElementById("pw-error").style.display = "none"}, 2000);</script>
<?php endif; ?>
</form>
<a href="/" class="return-home" title="点击回到网站首页">- 返回首页 - </a>
</div>
</body>
</html>
<?php
exit();
}
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