public function addItem(Item $item)
    {
        if ($this->items == null) {
            $this->items = [];
        }

        $this->items[] = $item;

        return $this;
    }
public function addItem(Item $item)
    {
        if ($this->items == null) {
            $this->items = [];
        }

        $this->items[] = $item;

        return $this;
    }
public function addItem ( Item $ item ) { if ( $ this -> items == null ) { $ this -> items = [ ] ; } $ this -> items [ ] = $ item ; return $ this ; }
@param Item $item

@return Cart
@param Item $item