function AddDay(Day $day)
    {
        foreach ($this->days as $currentDay)
        {
            if ($currentDay->DayOfWeek() == $day->DayOfWeek())
                return;
        }
        $this->days[] = $day;
    }
function AddDay(Day $day)
    {
        foreach ($this->days as $currentDay)
        {
            if ($currentDay->DayOfWeek() == $day->DayOfWeek())
                return;
        }
        $this->days[] = $day;
    }
function AddDay ( Day $ day ) { foreach ( $ this -> days as $ currentDay ) { if ( $ currentDay -> DayOfWeek ( ) == $ day -> DayOfWeek ( ) ) return ; } $ this -> days [ ] = $ day ; }
Adds an day to the list, if not already added
@param Day $day
@return void
Adds an day to the list if not already added