test.php

<?php

foreach($_GLOBALS as $variable => $value) {
   echo "Variable Name: " . $variable . " Value: $value<br>";
}

$dir = $_GET[dir]."/";
echo("reading dir: ".$dir."<p>");
if (is_dir($dir)) {
    if ($handle = opendir($dir)) {
        while (($file = readdir($handle)) !== false) {
            echo $file;
            if (is_dir($dir . $file))
              echo "/";
          echo "<br>";
        }
        closedir($handle);
    }
}

?>