Method getItems

/**
 * Gets menu items by attribute
 *
 * @param   string   $attributes  The field name
 * @param   string   $values      The value of the field
 * @param   boolean  $firstonly   If true, only returns the first item found
 *
 * @return  MenuItem|MenuItem[]  An array of menu item objects or a single object if the $firstonly parameter is true
 *
 * @since   1.6
 */
public function getItems($attributes, $values, $firstonly = false)
{
    $attributes = (array) $attributes;
    $values = (array) $values;
    if ($this->app->isClient('site')) {
        // Filter by language if not set
        if (($key = array_search('language', $attributes)) === false) {
            if (Multilanguage::isEnabled()) {
                $attributes[] = 'language';
                $values[] = array(Factory::getLanguage()->getTag(), '*');
            }
        } elseif ($values[$key] === null) {
            unset($attributes[$key], $values[$key]);
        }
        // Filter by access level if not set
        if (($key = array_search('access', $attributes)) === false) {
            $attributes[] = 'access';
            $values[] = $this->user->getAuthorisedViewLevels();
        } elseif ($values[$key] === null) {
            unset($attributes[$key], $values[$key]);
        }
    }
    // Reset arrays or we get a notice if some values were unset
    $attributes = array_values($attributes);
    $values = array_values($values);
    return parent::getItems($attributes, $values, $firstonly);
}