RouteMatch::getParameterNames

protected RouteMatch::getParameterNames()

protected function getParameterNames() {
  $names = array();
  if ($route = $this->getRouteObject()) {
    // Variables defined in path and host patterns are route parameters.
    $variables = $route->compile()->getVariables();
    $names = array_combine($variables, $variables);
    // Route defaults that do not start with a leading "_" are also
    // parameters, even if they are not included in path or host patterns.
    foreach ($route->getDefaults() as $name => $value) {
      if (!isset($names[$name]) && substr($name, 0, 1) !== '_') {
        $names[$name] = $name;
      }
    }
  }
  return $names;
}