限制，计数，使用PHP在mongodb中与众不同

Question

How can I use limit,count and sort with distinct in mongo from PHP ? I am using mongo command functionality and the code is like :

$data_count= $mongoInstance>command(array("distinct"=>"collection","key"=>"key","query"=>$filter_query));

How can I associate count, sort and limit with this ?

There is some aggeregate framework in mongo but how can I use it in PHP ?

Answer 1

I belive you are actually looking for the aggregation framework. The distinct command is quite limited in what it can do. An example of what you're looking for would be:

$db->col->aggregate(array(
    array('$match'=>$filter_query)
    array('$group'=>array('_id'=>'$key', 'count'=>array('$sum'=>1))),
    array('$sort'=>array('_id'=>-1)),
    array('$skip'=>4),
    array('$limit'=>20)
));

Further reference can be found here: http://docs.mongodb.org/manual/reference/aggregation/operator-nav/