一个可以加密文件夹，并且可以展示文件夹内文件的php代码：
<?php
$password = "123456"; // 这里是密码
$p = "";
if(isset($_COOKIE["isview"]) and $_COOKIE["isview"] == $password){
$isview = true;
}else{
if(isset($_POST["pwd"])){
if($_POST["pwd"] == $password){
setcookie("isview",$_POST["pwd"],time()+3600*3);
$isview = true;
}else{
$p = (empty($_POST["pwd"])) ? "需要密码才能查看，请输入密码。" : "密码不正确，请重新输入。";
}
}else{
$isview = false;
$p = "请输入密码查看，获取密码可联系我。";
}
}
if($isview){ ?>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="gb2312" />
<title>加密内容</title>
<meta name="Keywords" content="加密内容" />
<meta name="Description" content="加密内容" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body>
<div id="post">
<pre id="neirong">
<?php
$dir = "./";
// Open a known directory, and proceed to read its contents
if (is_dir($dir)) {
if ($dh = opendir($dir)) {
while (($file = readdir($dh)) !== false) {
if ($file!="." && $file!="..") {
echo "<a href=./".$file.">".$file."</a><br>";
}
}
closedir($dh);
}
}
?>
</pre>
</div>
</body></html>
<?php }else{ ?>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="gb2312" />
<title>输入密码</title>
<meta name="Keywords" content="输入密码" />
<meta name="Description" content="输入密码" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body>
<div id="post">
<img src="key.png">
<form action="?yes" method="post" style="margin:0px;">输入查看密码
<input type="password" name="pwd" /> <input type="submit" value="查看" />
</form>
<?php echo $p; ?>
</div>
<?php
} ?>
</body>
</html>来源：https://diannaobos.com/post/567.html
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