# The MongoDB\BSON\MaxKey class

(mongodb >=1.0.0)

## Introduction

Special BSON type which compares higher than all other possible BSON element values.

> Note: This is an internal MongoDB type used for indexing and sharding.

## Class synopsis

final class MongoDB\BSON\MaxKey implements MongoDB\BSON\MaxKeyInterface, MongoDB\BSON\Type, JsonSerializable {
/* Methods */
final public __construct()
final public jsonSerialize(): mixed
}

## Changelog

Version | Description
--- | ---
PECL mongodb 2.0.0 | This class no longer implements the Serializable interface.
PECL mongodb 1.3.0 | Implements MongoDB\BSON\MaxKeyInterface.
PECL mongodb 1.2.0 | Implements Serializable and JsonSerializable.

## Table of Contents

- MongoDB\BSON\MaxKey::__construct — Construct a new MaxKey
- MongoDB\BSON\MaxKey::jsonSerialize — Returns a representation that can be converted to JSON

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