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PHPLIB-402: Add aggregate helper to Database class
Merged from #642. https://jira.mongodb.org/browse/PHPLIB-402 I've extracted the `is_in_transaction` helper from `MongoDB\Collection` in a separate to functions since we need it more often. I've also decided to extract the options for the aggregate helper to a common file to avoid unnecessary duplication of option descriptions.
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‎docs/includes/apiargs-MongoDBCollection-method-aggregate-option.yaml

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arg_name: option
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name: allowDiskUse
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type: boolean
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description: |
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Enables writing to temporary files. When set to ``true``, aggregation stages
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can write data to the ``_tmp`` sub-directory in the ``dbPath`` directory. The
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default is ``false``.
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interface: phpmethod
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operation: ~
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optional: true
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source:
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file: apiargs-aggregate-option.yaml
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ref: allowDiskUse
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---
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arg_name: option
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name: batchSize
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type: integer
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description: |
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Specifies the initial batch size for the cursor. A batchSize of ``0`` means an
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empty first batch and is useful for quickly returning a cursor or failure
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message without doing significant server-side work.
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interface: phpmethod
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operation: ~
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optional: true
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source:
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file: apiargs-aggregate-option.yaml
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ref: batchSize
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---
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source:
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file: apiargs-MongoDBCollection-common-option.yaml
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file: apiargs-aggregate-option.yaml
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ref: bypassDocumentValidation
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post: |
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This only applies when using the :ref:`$out <agg-out>` stage.
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Document validation requires MongoDB 3.2 or later: if you are using an earlier
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version of MongoDB, this option will be ignored.
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---
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arg_name: option
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name: comment
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type: string
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description: |
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Users can specify an arbitrary string to help trace the operation through the
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database profiler, currentOp, and logs.
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source:
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file: apiargs-aggregate-option.yaml
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ref: comment
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post: |
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.. versionadded:: 1.3
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interface: phpmethod
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operation: ~
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optional: true
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---
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arg_name: option
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name: explain
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type: boolean
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description: |
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Specifies whether or not to return the information on the processing of the
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pipeline.
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source:
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file: apiargs-aggregate-option.yaml
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ref: explain
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post: |
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.. versionadded:: 1.4
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interface: phpmethod
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operation: ~
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optional: true
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---
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arg_name: option
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name: hint
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type: string|array|object
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description: |
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The index to use. Specify either the index name as a string or the index key
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pattern as a document. If specified, then the query system will only consider
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plans using the hinted index.
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source:
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file: apiargs-aggregate-option.yaml
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ref: hint
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post: |
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.. versionadded:: 1.3
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interface: phpmethod
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operation: ~
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optional: true
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---
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source:
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file: apiargs-common-option.yaml
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description: |
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Indicates whether the command will request that the server provide results
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using a cursor. The default is ``true``.
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.. note::
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MongoDB 3.6+ no longer supports returning results without a cursor (excluding
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when the explain option is used) and specifying false for this option will
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result in a server error.
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interface: phpmethod
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operation: ~
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optional: true

‎docs/includes/apiargs-MongoDBDatabase-method-aggregate-option.yaml

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source:
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file: apiargs-aggregate-option.yaml
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ref: allowDiskUse
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---
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source:
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file: apiargs-aggregate-option.yaml
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ref: batchSize
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---
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source:
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file: apiargs-aggregate-option.yaml
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ref: bypassDocumentValidation
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---
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source:
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file: apiargs-aggregate-option.yaml
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ref: comment
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---
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source:
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file: apiargs-aggregate-option.yaml
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ref: explain
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---
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source:
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file: apiargs-aggregate-option.yaml
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ref: hint
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---
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source:
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file: apiargs-common-option.yaml
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ref: maxTimeMS
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---
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source:
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file: apiargs-MongoDBDatabase-common-option.yaml
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ref: readConcern
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---
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source:
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file: apiargs-MongoDBDatabase-common-option.yaml
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ref: readPreference
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post: |
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This option will be ignored when using the :ref:`$out <agg-out>` stage.
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---
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source:
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file: apiargs-common-option.yaml
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ref: session
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---
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source:
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file: apiargs-MongoDBDatabase-common-option.yaml
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ref: typeMap
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---
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source:
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file: apiargs-MongoDBDatabase-common-option.yaml
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ref: writeConcern
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post: |
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This only applies when the :ref:`$out <agg-out>` stage is specified.
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This is not supported for server versions prior to 3.4 and will result in an
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exception at execution time if used.
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...

‎docs/includes/apiargs-MongoDBDatabase-method-aggregate-param.yaml

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arg_name: param
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name: $pipeline
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type: array
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description: |
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Specifies an :manual:`aggregation pipeline </core/aggregation-pipeline>`
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operation.
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interface: phpmethod
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operation: ~
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optional: false
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---
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source:
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file: apiargs-common-param.yaml
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ref: $options
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...

‎docs/includes/apiargs-aggregate-option.yaml

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arg_name: option
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name: allowDiskUse
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type: boolean
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description: |
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Enables writing to temporary files. When set to ``true``, aggregation stages
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can write data to the ``_tmp`` sub-directory in the ``dbPath`` directory. The
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default is ``false``.
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interface: phpmethod
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operation: ~
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optional: true
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---
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arg_name: option
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name: batchSize
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type: integer
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description: |
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Specifies the initial batch size for the cursor. A batchSize of ``0`` means an
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empty first batch and is useful for quickly returning a cursor or failure
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message without doing significant server-side work.
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interface: phpmethod
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operation: ~
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optional: true
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---
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source:
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file: apiargs-MongoDBCollection-common-option.yaml
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ref: bypassDocumentValidation
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post: |
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This only applies when using the :ref:`$out <agg-out>` stage.
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Document validation requires MongoDB 3.2 or later: if you are using an earlier
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version of MongoDB, this option will be ignored.
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---
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arg_name: option
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name: comment
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type: string
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description: |
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Users can specify an arbitrary string to help trace the operation through the
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database profiler, currentOp, and logs.
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interface: phpmethod
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operation: ~
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optional: true
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---
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arg_name: option
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name: explain
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type: boolean
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description: |
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Specifies whether or not to return the information on the processing of the
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pipeline.
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interface: phpmethod
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operation: ~
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optional: true
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---
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arg_name: option
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name: hint
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type: string|array|object
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description: |
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The index to use. Specify either the index name as a string or the index key
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pattern as a document. If specified, then the query system will only consider
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plans using the hinted index.
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interface: phpmethod
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operation: ~
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optional: true
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...

‎docs/reference/class/MongoDBDatabase.txt

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/reference/method/MongoDBDatabase__construct
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/reference/method/MongoDBDatabase__get
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/reference/method/MongoDBDatabase-aggregate
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/reference/method/MongoDBDatabase-command
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/reference/method/MongoDBDatabase-createCollection
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/reference/method/MongoDBDatabase-drop

‎docs/reference/method/MongoDBCollection-aggregate.txt

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.. include:: /includes/extracts/error-invalidargumentexception.rst
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.. include:: /includes/extracts/error-driver-runtimeexception.rst
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.. _php-agg-method-behavior:
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.. _php-coll-agg-method-behavior:
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Behavior
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--------
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See Also
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--------
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- :phpmethod:`MongoDB\\Database::aggregate()`
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- :manual:`aggregate </reference/command/aggregate>` command reference in the
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MongoDB manual
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- :manual:`Aggregation Pipeline </core/aggregation-pipeline>` documentation in

‎docs/reference/method/MongoDBDatabase-aggregate.txt

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==============================
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MongoDB\\Database::aggregate()
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==============================
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.. versionadded:: 1.5
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.. default-domain:: mongodb
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.. contents:: On this page
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:local:
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:backlinks: none
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:depth: 1
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:class: singlecol
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Definition
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----------
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.. phpmethod:: MongoDB\\Database::aggregate()
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Runs a specified :manual:`admin/diagnostic pipeline
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</reference/operator/aggregation-pipeline/#db-aggregate-stages>` which does
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not require an underlying collection. For aggregations on collection data,
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see :phpmethod:`MongoDB\\Collection::aggregate()`.
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.. code-block:: php
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function aggregate(array $pipeline, array $options = []): Traversable
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This method has the following parameters:
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.. include:: /includes/apiargs/MongoDBDatabase-method-aggregate-param.rst
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The ``$options`` parameter supports the following options:
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.. include:: /includes/apiargs/MongoDBDatabase-method-aggregate-option.rst
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Return Values
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-------------
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A :php:`MongoDB\\Driver\\Cursor <class.mongodb-driver-cursor>` or
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:php:`ArrayIterator <arrayiterator>` object. In both cases, the return value
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will be :php:`Traversable <traversable>`.
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Errors/Exceptions
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-----------------
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.. include:: /includes/extracts/error-unexpectedvalueexception.rst
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.. include:: /includes/extracts/error-unsupportedexception.rst
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.. include:: /includes/extracts/error-invalidargumentexception.rst
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.. include:: /includes/extracts/error-driver-runtimeexception.rst
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.. _php-db-agg-method-behavior:
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.. todo: add examples
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See Also
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--------
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- :phpmethod:`MongoDB\\Collection::aggregate()`
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- :manual:`aggregate </reference/command/aggregate>` command reference in the
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MongoDB manual
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- :manual:`Aggregation Pipeline </core/aggregation-pipeline>` documentation in
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the MongoDB Manual

‎docs/tutorial/crud.txt

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returns a :php:`Traversable <traversable>` object, which you can iterate upon to
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access the results of the aggregation operation. Refer to the
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:phpmethod:`MongoDB\\Collection::aggregate()` method's :ref:`behavior
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reference <php-agg-method-behavior>` for more about the method's output.
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reference <php-coll-agg-method-behavior>` for more about the method's output.
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The following example lists the 5 US states with the most zip codes associated
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with them:

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