A chapter of my book Persistence in PHP with Doctrine ORM is available for free on the Pack website.
This chapter explains some interesting Doctrine concepts including DQL (the proprietary SQL-like language of the Doctrine ORM), entity repositories, the query builder and aggregate functions.
[…] Another free chapter of my book Persistence in PHP with the Doctrine ORM is available on the Pack Website. In this second chapter of the book, you will: […]