Good day! Please, advise me some materials (websites, books, etc.) to establish a framework in php. Syntax and basic concepts are familiar. You need to understand the basic patterns, more widely to explore the functionality of php. Don't know where to start and which direction to move.
For understanding the architectural flexibility I would advise you to read a series of articles from Fabien Potencier, author of Symfony.
Books and websites will not help here, see the source code of existing frameworks, study how others write. Heed how they work is that learn a lot from you, otherwise you write "bicycles", etc.
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