arg_name: param name: $map type: :php:`MongoDB\\BSON\\Javascript <mongodb-bson-javascript>` description: | A JavaScript function that associates or "maps" a value with a key and emits the key and value pair. .. note:: Passing a Javascript instance with a scope is deprecated. Put all scope variables in the ``scope`` option of the MapReduce operation. interface: phpmethod operation: ~ optional: false --- arg_name: param name: $reduce type: :php:`MongoDB\\BSON\\Javascript <class.mongodb-bson-javascript>` description: | A JavaScript function that "reduces" to a single object all the values associated with a particular key. .. note:: Passing a Javascript instance with a scope is deprecated. Put all scope variables in the ``scope`` option of the MapReduce operation. interface: phpmethod operation: ~ optional: false --- arg_name: param name: $out type: string|document description: | Specifies where to output the result of the map-reduce operation. You can either output to a collection or return the result inline. On a primary member of a replica set you can output either to a collection or inline, but on a secondary, only inline output is possible. interface: phpmethod operation: ~ optional: false --- source: file: apiargs-common-param.yaml ref: $options ...