Simple difference between public&private&protect in PHP and usage introduction

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Public "common"

Can be called from anywhere in the program (within the class, outside the Class) by other classes and objects. Subclasses can inherit and use all public members in the parent class.

Private "privately-owned"

Variables and methods that are modified by private can only be called and modified within the class in which they are located, and cannot be accessed outside of the class. It is also not possible in subclasses.

If called directly, an error occurs.

Protect "protected"

Class members decorated with protected can be called in this class and in subclasses, but cannot be called anywhere else.

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