MongoDB\BSON\Undefined::__construct Construct a new Undefined (unused) &reftitle.description; final private MongoDB\BSON\Undefined::__construct MongoDB\BSON\Undefined objects are created through conversion from a deprecated BSON type and cannot be constructed directly. &reftitle.parameters; &no.function.parameters; &reftitle.errors; &mongodb.throws.argumentparsing; &reftitle.seealso; BSON Types