When\When::abbrevToDayName PHP Метод

    private static function abbrevToDayName($abbrev)
    {
        $daynames = array('su' => 'Sunday', 'mo' => 'Monday', 'tu' => 'Tuesday', 'we' => 'Wednesday', 'th' => 'Thursday', 'fr' => 'Friday', 'sa' => 'Saturyday');
        return $daynames[strtolower($abbrev)];
    }