添加在页面顶部即可，内容是或者要显示的PHP代码是写在密码提示代码下面。
代码一： (cookie六十秒就过期需要重新输入密码)
<?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;$p = "此页面加密请输入密码。";}}?>
<?php if($isview){?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>使用后请关闭！</title>
<style type="text/css">
body{background:none;}
.passport{width:400px;position:absolute;left:50%;
top:50%;margin-left:-200px;margin-top:-55px;font-size:18px;text-align:center;line-height:30px;/*color:red;*/}
</style>
</head>
<body>
<div class="passport">
显示内容
</div>
</body>
</html>
<?php }else{?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>此页面加密请输入密码！</title>
<style type="text/css">
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;">
password:<input type="password" name="pwd" /> <input type="submit" value="OK" />
</form>
<?php echo $p;?>
</div></div>
</body>
</html>
<?php }?>代码二：<?php
$adminkey = "123";/*设置密码*/
session_start();
if(@$_POST['password'] == $adminkey){
$_SESSION['login'] = md5($adminkey);
}
if($_SERVER['QUERY_STRING'] == "logout"){
$_SESSION['login'] = "";
header("location: " . $_SERVER['PHP_SELF']);
exit();
}
$html_login = <<<EOF
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
div{text-align:center; margin:0 auto;}
#loginform{width:230px;height:100px;background-color:#ffffff;box-shadow: 2px 2px 10px 1px #403f3f;}
</style>
</head>
<body>
<div id="loginform">
<div style="text-align:center; margin:260px auto 0px;">
<form action="" method="post">密码<input type="password" name="password" style="width:120px; margin-top: 35px;">
<input type="submit" value="登录" style="margin-left: 5px;">
</form>
</div>
</div>
</body>
</html>
EOF;
if(@$_SESSION['login'] != md5($adminkey)){
exit($html_login);
}
?>
这里加上要显示的内容文字或者代码。
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这个好，下来看看。