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A brief discussion on the scope of access modifiers private, protected, and public in PHP
- 高洛峰Original
- 2016-12-12 09:31:352199browse
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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