Drupal get_params

/**
 * Get URI parameter.
 *
 * @param string $str
 *   Example to use $str urldecode(drupal_get_destination()).
 * @return array
 */
function _more_node_buttons_get_params($str) {
  $chunks = explode("?", $str);
  $params = explode("&", $chunks[1]);

  $data = array();
  foreach ($params as $chunk) {
    $parts = explode("=", $chunk, 2);
    if (count($parts) == 2) {
      list($k, $v) = $parts;
      $data[$k] = check_plain(urldecode($v));
    }
  }

  return $data;
}