Symfony 5: The Fast Track is the best book to learn
modern Symfony development, from zero to production. +300 pages in full color showing how to
combine Symfony with Docker, APIs, queues & async tasks, Webpack, Single-Page Applications, etc.
The LockHandler utility was removed in Symfony 4.0. Use the new Symfony
Lock component instead.
This work, including the code samples, is licensed under a
Creative Commons BY-SA 3.0