(mongodb >=1.0.0)
BSON type for an » ObjectId. The value consists of 12 bytes, where the first four bytes are a timestamp that reflect the ObjectId's creation. Specifically, the value consists of:
In MongoDB, each document stored in a collection requires a unique _id field that acts as a primary key. If an inserted document omits the _id field, the driver automatically generates an ObjectId for the _id field.
Using ObjectIds for the _id field provides the following additional benefits:
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1.3.0 |
Renamed from MongoDB\BSON\ObjectID to MongoDB\BSON\ObjectId. |
1.2.0 | Implements Serializable and JsonSerializable. |