Change Skin

<?php
  ################################################################
  # Change Skin 1.0 - 12/07/2018 © Alessandro Marinuzzi [Alecos] #
  ################################################################
  @ini_set('default_charset', 'UTF-8');
  header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
  header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  header("Cache-Control: no-store, no-cache, must-revalidate");
  header("Cache-Control: post-check=0, pre-check=0", false);
  header("Pragma: no-cache");
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
  <meta http-equiv="content-type" content="text/html;charset=utf-8">
  <meta name="author" content="Alessandro Marinuzzi [Alecos]">
  <meta name="generator" content="Notepad2">
  <meta name="pragma" content="no-cache">
  <meta name="robots" content="noindex, nofollow">
  <title>Change Skin</title>
<?php
  if (isset($_POST['change'])) {
    switch ($_POST['skin']) {
      case 'finalfantasy.css':
      setcookie('skin', 'finalfantasy.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'finalfantasy.css';
      break;
      case 'science.css':
      setcookie('skin', 'science.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'science.css';
      break;
      case 'matrix.css':
      setcookie('skin', 'matrix.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'matrix.css';
      break;
      case 'stylish.css':
      setcookie('skin', 'stylish.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'stylish.css';
      break;
      default:
      setcookie('skin', 'default.css', time()+31556926 ,'/');
      $_COOKIE['skin'] = 'default.css';
    }
  }
  if (isset($_COOKIE['skin'])) {
    $my_skin = htmlspecialchars($_COOKIE['skin'], ENT_QUOTES);
    echo "  <link rel=\"stylesheet\" type=\"text/css\" media=\"screen\" href=\"$my_skin\">\r\n";
  } else {
    echo "  <link rel=\"stylesheet\" type=\"text/css\" media=\"screen\" href=\"default.css\">\r\n";
  }
?>
</head>

<body>

<form name="skin" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>" method="post">
<select name="skin" class="skin">
<option class="my_skin" value="finalfantasy.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'finalfantasy.css') { echo ' selected'; } ?>>finalfantasy</option>
<option class="my_skin" value="science.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'science.css') { echo ' selected'; } ?>>science</option>
<option class="my_skin" value="matrix.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'matrix.css') { echo ' selected'; } ?>>Matrix</option>
<option class="my_skin" value="stylish.css"<?php if (isset($_COOKIE['skin']) && $_COOKIE['skin'] == 'stylish.css') { echo ' selected'; } ?>>stylish</option>
</select>
<input class="button" type="submit" name="change" value="Change Skin">
</form>

</body>

</html>