MongoDB PHP and $out to collection

Question

Is there a way to output aggregation result to a collection when using Mongo PHP driver? Usually it's done with $out : "collection_name" when running aggregate in mongo shell like this:

db.collection.aggregate([
    {$match},
    {$group},
    {
        $out : "newcollection"
    }
]);

When using PHP driver, like this:

    $m = new MongoClient("localhost");
    $c = $m->selectDB($this->mongodb)->selectCollection($this->scrapedCollection);

    $r = $c->aggregate($pipeline);

it returns result to $r and then you have to iterate over results and insert them one by one in new collection.

I'd like to pass $out option to Mongo PHP Driver in aggregate function.

I couldn't find answer in their docs, anyone faced this situation?

Answer 1

$ out也是一个聚合管道运算符（就像$ match和$ sort一样），因此请在管道​​的最后阶段使用它，指定输出集合名称。