alcaeus / mongo-php-adapter

    /**

     * @return \Iterator

     */

    protected function ensureIterator()

    {

        if ($this->iterator === null) {

            // MongoDB\Driver\Cursor needs to be wrapped into a \Generator so that a valid \Iterator with working implementations of

            // next, current, valid, key and rewind is returned. These methods don't work if we wrap the Cursor inside an \IteratorIterator

            $this->iterator = $this->wrapTraversable($this->ensureCursor());

        }

        return $this->iterator;

    }

    /**

     * @param \Traversable $traversable

            'options' => $this->options,

            'operation' => 'count',

            'name' => $this->collection->getCollectionName()

        ], function () {

            // MongoDB\Driver\Cursor needs to be wrapped into a \Generator so that a valid \Iterator with working implementations of

            // next, current, valid, key and rewind is returned. These methods don't work if we wrap the Cursor inside an \IteratorIterator

            if ($this->iterator === null) {

                $this->iterator = $this->wrapTraversable($this->ensureCursor());

            }

            return $this->iterator;

        });

    }

    /**