MongoDB组按键PHP

好的，我的MongoDB中有一个收藏

这是一个样本我的钥匙在这里

公司

现在的问题是我有4行/收集hoyts，我需要将它们分组

我当前的代码

public function getstore($storename)
    {
        // select a collection (analogous to a relational database's table)
         $collection = $this->db->products;

        // find everything in the collection
        $cursor = $collection->find(array("store_name"=>$storename));

        $test = array();
            // iterate through the results
            while( $cursor->hasNext() ) {
                $test[] = ($cursor->getNext());
            }
        //Print Results 
        print json_encode($test);

    }

我试着用

组（$key）->查找

然而，这并没有起作用

有人能帮我一下吗谢谢看这个例子：

public function getstore($storename)
    {
        // select a collection (analogous to a relational database's table)
         $collection = $this->db->products;

        // find everything in the collection
        $cursor = $collection->find(array("store_name"=>$storename));

        $test = array();
            // iterate through the results
            while( $cursor->hasNext() ) {
                $test[] = ($cursor->getNext());
            }
        //Print Results 
        print json_encode($test);

    }