<?php
if ($_POST['hidden']) {
$key = "../g_test/uploads";
$new_folder = $_POST['nazevS'];
$new_dir_path = $key."/".$new_folder;
$dir = mkdir($new_dir_path);
if($dir)
chmod ($new_dir_path, 0777);
}
if ($_POST['hiddenSS']) {
$key = "../g_test/uploads";
$new_folder = $_POST['nazevS'];
rmdir($key."/".$new_folder);
}
?>

Warning: rmdir(../g_test/uploads/) [function.rmdir]: Permission denied in /home/free/howto.cz/m/mousemys/root/www/g_test/upload.php on line 51

$new_folder = $_POST['nazevS'];
$new_dir_path = $key."/".$new_folder;

$hd = opendir($mydir);

closedir($hd);

function force_rmdir($path) {
  if (!file_exists($path)) return false;

  if (is_file($path) || is_link($path)) {
    return unlink($path);
  }

  if (is_dir($path)) {
    $path = rtrim($path, DIR_SEPARATOR) . DIR_SEPARATOR;

    $result = true;

    $dir = new DirectoryIterator($path);

    foreach ($dir as $file) {
      if (!$file->isDot()) {
        $result &= force_rmdir($path . $file->getFilename(), false, $sizeErased);
      }
    }

    $result &= rmdir($path);
    return $result;
  }
}

chmod ug+rw /home/free/howto.cz/m/mousemys/root/www/g_test/

sudo chmod ug+rw /home/free/howto.cz/m/mousemys/root/www/g_test/

chgrp -R www-data g_test/uploads
chmod g+w g_test/uploads