Object Oriented Principles In PHP
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.. toctree::
   :maxdepth: 2

        Classes  <./1-Classes.rst>
        Objects  <./2-Objects.rst>
        Inheritance  <./3-Inheritance.rst>
        Abstract-Classes  <./4-Abstract-Classes.rst>
        Handshakes-and-Interfaces  <./5-Handshakes-and-Interfaces.rst>
        Encapsulation  <./6-Encapsulation.rst>
        Object-Composition-and-Abstractions  <./7-Object-Composition-and-Abstractions.rst>
        Value-Objects-and-Mutability  <./8-Value-Objects-and-Mutability.rst>
        Exceptions  <./9-Exceptions.rst>