<?php
$password = "123";//密码 
$p = "";if(isset($_COOKIE["isview"]) and $_COOKIE["isview"] == $password){ 
$isview = true;}else{ 
if(isset($_POST["pwd"])){ 
if($_POST["pwd"] == $password){ 
setcookie("isview",$_POST["pwd"],time()+60);$isview = true;}else{$p = (empty($_POST["pwd"])) ?"请输入密码." : "<div style=\"color:#F00;\">密码不正确.</div>";} 
}else{$isview = false;$p = "此页面加密请输入密码。";}}?>

<?php echo $p;?> 静态HTML前端密码错误调用样式

<?php if($isview){?>

<?php/********************加密内容开始********************/?>

//此处填入加密内容的文字或者代码即可

<?php/********************加密END********************/?>

<?php }else{?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>xxx标题</title>
<style>
body{background:none;}
.passport{border:1px solid red;background-color:#FFFFCC;
width:400px;height:100px;position:absolute;left:49.9%;top:49.9%;margin-left:-200px;margin-top:-55px;
font-size:14px;text-align:center;line-height:30px;color:#746A6A;}
</style>
</head>
<body>
<div class="passport"><div style="padding-top:20px;"> 
<form action="" method="post" style="margin:0px;">
输入查看密码<input type="password" name="pwd" /> <input type="submit" value="登录" /> 
</form> 
<?php echo $p;?> 
</div>
</div> 
</body>
</html> 
<?php }?>