I ask for help with OOP links in PHP

    Gentlemen, PHP developers and "pretenders", please - share links to resources where you can gain knowledge that helps to achieve a good understanding of OOP in PHP. Namely, on those sites where a lot of talk about patterns (mappers, facades, factories, etc.) and levels of abstraction (I will not say more precisely, because I doubt my own interpretation of the term).
    It is also possible for scripts (engines) of something developed using the described approaches.

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