How to write php permission control

PHP5 provides 3 access methods:

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They are as follows:

(1) public: can be accessed without restrictions. Any code outside the class can read and write public properties. In versions before PHP5, all methods and Properties are all public.

(2) private: only visible inside the class. Any member and class instance in the class can access private members. Outside the class, the value of the private attribute cannot be changed or read, nor can Call private methods. Subclasses cannot access private members of the parent class.

(3) protected: Can be accessed by methods of the same class and inherited classes.

If not specified, the default is public.

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