MongoDB\BSON\Persistable::bsonSerializeProvides an array or document to serialize as BSON 説明
abstract public arraystdClassMongoDB\BSON\Document MongoDB\BSON\Persistable::bsonSerialize()
Called during serialization of the object to BSON. The method must return an array, stdClass, or MongoDB\BSON\Document. The return value will always be serialized as a BSON document. The serialized document will include a field containing the class name of the object. For this reason, it is not possible to return a MongoDB\BSON\PackedArray instance in this method. Users are encouraged to include an _id property (e.g. a MongoDB\BSON\ObjectId initialized in your constructor) when returning data for a BSON root document; otherwise, the driver or database will need to generate a MongoDB\BSON\ObjectId when inserting or upserting the document, respectively. パラメータこの関数にはパラメータはありません。 戻り値An array, stdClass, or MongoDB\BSON\Document to be serialized as a BSON document. 変更履歴
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