MongoDB\BSON
PHP Manual

The MongoDB\BSON\Undefined class

Introduction

BSON type for the "Undefined" type. This BSON type is deprecated, and this class can not be instantiated. It will be created from a BSON undefined type while converting BSON to PHP, and can also be converted back into BSON while storing documents in the database.

Class synopsis

MongoDB\BSON\Undefined
final class MongoDB\BSON\Undefined implements MongoDB\BSON\Type, JsonSerializable, Stringable {
/* Methods */
final private __construct()
final public mixed jsonSerialize()
final public string __toString()
}

Changelog

Version Description
PECL mongodb 2.0.0

This class no longer implements the Serializable interface.

PECL mongodb 1.12.0 Implements Stringable for PHP 8.0+.

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