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Note: I expect to update the book in the future to cover the contents of the new exam for Symfony 3/4, but I don't have an ETA. If you already bought the book, you will have free access to the new version once it gets released.
PHP developer with 10+ years of experience. PHP 5.3 Zend Certified Engineer and SensioLabs Certified Symfony Developer (Expert level). Currently working at ServerGrove.