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A brief discussion on the scope of access modifiers private, protected, and public in PHP

高洛峰
Release： 2023-03-03 13:10:01
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1. Private can only be used inside the class.

2. Protected can be used inside the class and inherited classes. It cannot be used outside the class [that is, the instantiated object cannot be called]

3. Public applies to all scopes.

4. When a subclass overrides a method in a parent class, the scope of the access modifier in the subclass must be greater than or equal to the parent class's [ Inheritance can only be carried forward, or at least remain unchanged. Don't lose things. 】


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