The MongoDB\BSON\Undefined class

    (mongodb >=1.4.0)

    简介

    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.

    类摘要

    final class MongoDB\BSON\Undefined implements MongoDB\BSON\Type, JsonSerializable, Stringable {
    /* 方法 */
    final private __construct()
    final public jsonSerialize(): mixed
    final public __toString(): string
    }

    更新日志

    版本 说明
    PECL mongodb 2.0.0

    This class no longer implements the Serializable interface.

    PECL mongodb 1.12.0 Implements Stringable for PHP 8.0+.

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