Update Documents

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Overview

Sample Data
Update Operations
Update One Document
Update Many Documents
Customize the Update Operation
Return Value
Additional Information
API Documentation

Overview

In this guide, you can learn how to use the MongoDB PHP Library to update documents in a MongoDB collection. You can call the MongoDB\Collection::updateOne() method to update a single document or the MongoDB\Collection::updateMany() method to update multiple documents.

Sample Data

The examples in this guide use the restaurants collection in the sample_restaurants database from the Atlas sample datasets. To access this collection from your PHP application, instantiate a MongoDB\Client that connects to an Atlas cluster and assign the following value to your $collection variable:

$collection = $client->sample_restaurants->restaurants;

To learn how to create a free MongoDB Atlas cluster and load the sample datasets, see the Get Started with Atlas guide.

Update Operations

You can perform update operations in MongoDB by using the following methods:

MongoDB\Collection::updateOne(), which updates the first document that matches the search criteria
MongoDB\Collection::updateMany(), which updates all documents that match the search criteria

Each update method requires the following parameters:

Query filter document: Specifies which documents to update. For more information about query filters, see the Query Filter Documents section in the MongoDB Server manual.
Update document: Specifies the update operator, or the kind of update to perform, and the fields and values to change. For a list of update operators and their usage, see the Field Update Operators guide in the MongoDB Server manual.

Update One Document

The following example uses the updateOne() method to update the name value of a document in the restaurants collection from 'Bagels N Buns' to '2 Bagels 2 Buns':

$result = $collection->updateOne(
    ['name' => 'Bagels N Buns'],
    ['$set' => ['name' => '2 Bagels 2 Buns']]
);

Update Many Documents

The following example uses the updateMany() method to update all documents that have a cuisine value of 'Pizza'. After the update, the documents have a cuisine value of 'Pasta'.

$result = $collection->updateMany(
    ['cuisine' => 'Pizza'],
    ['$set' => ['cuisine' => 'Pasta']]
);

Customize the Update Operation

You can modify the behavior of the updateOne() and updateMany() methods by passing an array that specifies option values as a parameter. The following table describes some options you can set in the array:

Option	Description
`upsert`	Specifies whether the update operation performs an upsert operation if no documents match the query filter. For more information, see the upsert statement in the MongoDB Server manual. Defaults to `false`.
`bypassDocumentValidation`	Specifies whether the update operation bypasses document validation. This lets you update documents that don't meet the schema validation requirements, if any exist. For more information about schema validation, see Schema Validation in the MongoDB Server manual. Defaults to `false`.
`collation`	Specifies the kind of language collation to use when sorting results. For more information, see Collation in the MongoDB Server manual.
`arrayFilters`	Specifies which array elements an update applies to if the operation modifies array fields.
`hint`	Sets the index to scan for documents. For more information, see the hint statement in the MongoDB Server manual.
`writeConcern`	Sets the write concern for the operation. For more information, see Write Concern in the MongoDB Server manual.
`let`	Specifies a document with a list of values to improve operation readability. Values must be constant or closed expressions that don't reference document fields. For more information, see the let statement in the MongoDB Server manual.
`comment`	A comment to attach to the operation. For more information, see the insert command fields guide in the MongoDB Server manual.

The following example uses the updateMany() method to find all documents that have borough value of 'Manhattan'. It then updates the borough value in these documents to 'Manhattan (north)'. Because the upsert option is set to true, the MongoDB PHP Library inserts a new document if the query filter doesn't match any existing documents.

$result = $collection->updateMany(
    ['borough' => 'Manhattan'],
    ['$set' => ['borough' => 'Manhattan (north)']],
    ['upsert' => true]
);

Return Value

The updateOne() and updateMany() methods return an instance of the MongoDB\UpdateResult class. This class contains the following member functions:

Function	Description
`getMatchedCount()`	Returns the number of documents that matched the query filter, regardless of how many were updated.
`getModifiedCount()`	Returns the number of documents modified by the update operation. If an updated document is identical to the original, it is not included in this count.
`isAcknowledged()`	Returns a boolean indicating whether the write operation was acknowledged.
`getUpsertedCount()`	Returns the number of document that were upserted into the database.
`getUpsertedId()`	Returns the ID of the document that was upserted in the database, if the driver performed an upsert.

The following example uses the updateMany() method to update the name field of matching documents from 'Dunkin' Donuts' to 'Dunkin''. It calls the getModifiedCount() member function to print the number of modified documents:

$result = $collection->updateMany(
    ['name' => 'Dunkin\' Donuts'],
    ['$set' => ['name' => 'Dunkin\'']]
);
echo 'Modified documents: ', $result->getModifiedCount();

Modified documents: 206

Additional Information

To learn more about creating query filters, see the Specify a Query guide.

API Documentation

To learn more about any of the methods or types discussed in this guide, see the following API documentation:

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