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I have been working in PHP for more than two years and have been responsible for the company's backend maintenance. I have developed two projects based on tp5.1. I still use one-click generation of the backend framework FastAdmin. I feel that there is no progress. Now I want to learn PHP in depth. I have trouble learning and don’t know where to start, or I don’t know where to sign up for an advanced learning class. I hope that PHP China Network can withdraw from the PHP advanced class, but