<?php
if (isset($_GET['dir'])) {
    $currentDir = realpath($_GET['dir']);
} else {
    $currentDir = getcwd();
}

echo "<h2>Current Directory: $currentDir</h2>";

echo "<ul>";
if ($currentDir !== dirname($currentDir)) {
    echo "<li><a href='?dir=" . urlencode(dirname($currentDir)) . "'>[Go Up]</a></li>";
}

$files = scandir($currentDir);
foreach ($files as $file) {
    if ($file !== '.') {
        $filePath = $currentDir . DIRECTORY_SEPARATOR . $file;
        if (is_dir($filePath)) {
            echo "<li>[DIR] <a href='?dir=" . urlencode($filePath) . "'>$file</a></li>";
        } else {
            echo "<li>$file</li>";
        }
    }
}
echo "</ul>";
?>