The latest release of the MongoDB PHP driver includes support for MongoDB 4.2, with a focus on high-level abstraction and improved transaction management capabilities. The low-level extension adds support for multi-document transactions on sharded clusters, while the high-level library provides a convenient API for working with transactions and improved change stream support. Additionally, both drivers now enable retryable reads and writes by default, allowing applications to automatically retry commands that fail due to network issues or other errors.