The MongoDB\BSON\Undefined class

(mongodb >=1.4.0)

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.

final class MongoDB\BSON\Undefined implements MongoDB\BSON\Type, JsonSerializable, Stringable {

/* Methods */

final private function __construct()

final public function jsonSerialize(): mixed

final public function __toString(): string

}

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+.

The MongoDB\BSON\Undefined class

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