PHP - Manual: MongoDB\BSON\Undefined::serialize
2024-11-15
(mongodb >=1.4.0)
MongoDB\BSON\Undefined::serialize — Serialize a Undefined
此函数没有参数。
Returns the serialized representation of the MongoDB\BSON\Undefined.
官方地址:https://www.php.net/manual/en/mongodb-bson-undefined.serialize.php