public function addCell(Cell $cell)
    {
        if (!$this->cells->contains($cell)) {
            $cell->SetQuestion($this);
            $this->cells->add($cell);
        }
    }
public function addCell(Cell $cell)
    {
        if (!$this->cells->contains($cell)) {
            $cell->SetQuestion($this);
            $this->cells->add($cell);
        }
    }
public function addCell ( Cell $ cell ) { if ( ! $ this -> cells -> contains ( $ cell ) ) { $ cell -> SetQuestion ( $ this ) ; $ this -> cells -> add ( $ cell ) ; } }
Add cell.

@param Cell $cell
Add cell .