<?php $dir = explode('?', $_SERVER['REQUEST_URI'])[0]; ?><!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title><?= $dir ?> directory listing</title>
</head>
<body>
<ul>
<?php
foreach( scandir('.') as $entry ){
    if($entry[0]=="." || $entry==basename(__FILE__)) continue;
    ?><li><a href="<?=$entry?>" target="_blank" ><?=$entry?></a></li>
<?php
}
?>
</ul>
<pre><?= htmlspecialchars( file_get_contents( $_SERVER['SCRIPT_FILENAME'] ))."\n" ?></pre>
</body>
</html>