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• MongoDB\Database::createCollection()

MongoDB\Database::createCollection()

Definition

MongoDB\Database::createCollection

Explicitly creates a collection.

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function createCollection(string $collectionName, array $options = []): array|object

MongoDB creates collections implicitly when you first reference the collection in a command, such as when inserting a document into a new collection. You may also explicitly create a collection with specific options using the MongoDB\Database::createCollection() method, or using db.createCollection() in the MongoDB shell.

Explicitly creating collections enables you to create capped collections, specify document validation criteria, or configure your storage engine or indexing options.

This method has the following parameters:

Parameter	Type	Description
$collectionName	string	The name of the collection to create.
$options	array	Optional. An array specifying the desired options.

The $options parameter supports the following options:

Option	Type	Description
autoIndexId	boolean	Optional. Specify false to disable the automatic creation of an index on the _id field. Important For replica sets, do not set autoIndexId to false. Deprecated since version 1.4: This option has been deprecated since MongoDB 3.2. As of MongoDB 4.0, this option cannot be false when creating a replicated collection (i.e. a collection outside of the local database in any mongod mode).
capped	boolean	Optional. To create a capped collection, specify true. If you specify true, you must also set a maximum size in the size option.
changeStreamPreAndPostImages	document	Optional. Used to configure support for pre- and post-images in change streams. See the create command documentation for more information. This option is available in MongoDB 6.0+ and will result in an exception at execution time if specified for an older server version. New in version 1.13.
clusteredIndex	document	Optional. A clustered index specification. See Clustered Collections or the create command documentation for more information. This option is available in MongoDB 5.3+ and will result in an exception at execution time if specified for an older server version. New in version 1.13.
collation	array|object	Optional. Specifies the collation for the collection. Collation allows users to specify language-specific rules for string comparison, such as rules for lettercase and accent marks. When specifying collation, the locale field is mandatory; all other collation fields are optional. For descriptions of the fields, see Collation Document.
comment	mixed	Optional. Enables users to specify an arbitrary comment to help trace the operation through the database profiler, currentOp output, and logs. This is not supported for server versions prior to 4.4 and will result in an exception at execution time if used. New in version 1.13.
encryptedFields	document	Optional. A document describing encrypted fields for queryable encryption. If omitted, the encryptedFieldsMap option within the autoEncryption driver option will be consulted. See Field Encryption and Queryability in the MongoDB manual for more information. This option is available in MongoDB 7.0+ and will result in an exception at execution time if specified for an older server version. New in version 1.13.
expireAfterSeconds	integer	Optional. Used to automatically delete documents in time series collections. See the create command documentation for more information. This option is available in MongoDB 5.0+ and will result in an exception at execution time if specified for an older server version. New in version 1.9.
flags	integer	Optional. Available for the MMAPv1 storage engine only to set the usePowerOf2Sizes and noPadding flags. The MongoDB PHP Library provides constants that you can combine with a bitwise OR operator to set the flag values: MongoDB\Operation\CreateCollection::USE_POWER_OF_2_SIZES: 1 MongoDB\Operation\CreateCollection::NO_PADDING: 2 Defaults to 1. Note MongoDB 3.0 and later ignores the usePowerOf2Sizes flag. See collMod and db.createCollection() for more information.
indexOptionDefaults	array|object	Optional. Allows users to specify a default configuration for indexes when creating a collection. The indexOptionDefaults option accepts a storageEngine document, which should take the following form: copy { <storage-engine-name>: <options> } Storage engine configurations specified when creating indexes are validated and logged to the oplog during replication to support replica sets with members that use different storage engines.
max	integer	Optional. The maximum number of documents allowed in the capped collection. The size option takes precedence over this limit. If a capped collection reaches the size limit before it reaches the maximum number of documents, MongoDB removes old documents. If you prefer to use the max limit, ensure that the size limit, which is required for a capped collection, is sufficient to contain the maximum number of documents.
maxTimeMS	integer	Optional. The cumulative time limit in milliseconds for processing operations on the cursor. MongoDB aborts the operation at the earliest following interrupt point.
pipeline	array	Optional. An array that consists of the aggregation pipeline stage(s), which will be applied to the collection or view specified by viewOn. See the create command documentation for more information. New in version 1.13.
session	MongoDB\Driver\Session	Optional. Client session to associate with the operation. New in version 1.3.
size	integer	Optional. Specify a maximum size in bytes for a capped collection. Once a capped collection reaches its maximum size, MongoDB removes the older documents to make space for the new documents. The size option is required for capped collections and ignored for other collections.
storageEngine	array|object	Optional. Available for the WiredTiger storage engine only. Allows users to specify configuration to the storage engine on a per-collection basis when creating a collection. The value of the storageEngine option should take the following form: copy { <storage-engine-name>: <options> } Storage engine configurations specified when creating collections are validated and logged to the oplog during replication to support replica sets with members that use different storage engines.
timeseries	array|object	Optional. An object containing options for creating time series collections. See the create command documentation for supported options. This option is available in MongoDB 5.0+ and will result in an exception at execution time if specified for an older server version. New in version 1.9.
typeMap	array	Optional. The type map to apply to cursors, which determines how BSON documents are converted to PHP values. Defaults to the database’s type map. This will be used for the returned command result document.
validator	array|object	Optional. Allows users to specify validation rules or expressions for the collection. For more information, see Document Validation in the MongoDB manual. The validator option takes an array that specifies the validation rules or expressions. You can specify the expressions using the same operators as MongoDB’s query operators with the exception of $geoNear, $near, $nearSphere, $text, and $where. Note Validation occurs during updates and inserts. Existing documents do not undergo validation checks until modification. You cannot specify a validator for collections in the admin, local, and config databases. You cannot specify a validator for system.* collections.
validationAction	string	Optional. Determines whether to error on invalid documents or just warn about the violations but allow invalid documents to be inserted. Important Validation of documents only applies to those documents as determined by the validationLevel. validationAction Description "error" Default. Documents must pass validation before the write occurs. Otherwise, the write operation fails. "warn" Documents do not have to pass validation. If the document fails validation, the write operation logs the validation failure.
validationLevel	string	Optional. Determines how strictly MongoDB applies the validation rules to existing documents during an update. validationLevel Description "off" No validation for inserts or updates. "strict" Default. Apply validation rules to all inserts and all updates. "moderate" Apply validation rules to inserts and to updates on existing valid documents. Do not apply rules to updates on existing invalid documents.
viewOn	string	Optional. The name of the source collection or view from which to create the view. Note The name is not the full namespace of the collection or view (i.e. it does not include the database name). Views must be created in the same databases as the source collection or view. New in version 1.13.
writeConcern	MongoDB\Driver\WriteConcern	Optional. Write concern to use for the operation. Defaults to the database’s write concern.

Note that not all options are available on all versions of MongoDB. Refer to the create command reference in the MongoDB manual for compatibility considerations.

Return Values

An array or object with the result document of the create command.

Errors/Exceptions

MongoDB\Exception\UnsupportedException if options are used and not supported by the selected server (e.g. collation, readConcern, writeConcern).

MongoDB\Exception\InvalidArgumentException for errors related to the parsing of parameters or options.

MongoDB\Driver\Exception\RuntimeException for other errors at the driver level (e.g. connection errors).

Example

The following example creates a users collection in the test database with document validation criteria:

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<?php

$db = (new MongoDB\Client)->test;

$result = $db->createCollection('users', [
    'validator' => [
        'username' => ['$type' => 'string'],
        'email' => ['$regex' => '@mongodb\.com$'],
    ],
]);

var_dump($result);

The output would then resemble:

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object(MongoDB\Model\BSONDocument)#11 (1) {
  ["storage":"ArrayObject":private]=>
  array(1) {
    ["ok"]=>
    float(1)
  }
}

See Also

• create command reference in the MongoDB manual
• db.createCollection()
• Time Series Collections

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