Feed.php
public function remove($id)
    {
        $success = false;
        foreach ($this->items as $i => $item) {
            if ($item->getFeedId() === $id) {
                unset($this->items[$i]);
                $success = true;
                break;
            }
        }

        if (false === $success) {
            throw new \InvalidArgumentException('Unknown item');
        }

        return $this;
    }
public function remove($id)
    {
        $success = false;
        foreach ($this->items as $i => $item) {
            if ($item->getFeedId() === $id) {
                unset($this->items[$i]);
                $success = true;
                break;
            }
        }

        if (false === $success) {
            throw new \InvalidArgumentException('Unknown item');
        }

        return $this;
    }
Removes an item by Id

@throws \InvalidArgumentException
@param $id
@return Feed