Thoughts caused by protected in php

This article mainly introduces the thoughts about protected in php. It has certain reference value. Now I share it with you. Friends in need can refer to it

protected: is protected Protected, it can only be used inside the class and inherited classes, and cannot be used outside the class. In other words, it is the use of $this-> or $parent::;

to call the parent class: variable in the subclass and parent class$this-> Variable name, if there is this variable in the subclass, the variable in the subclass will be called, if not, the variable in the parent class will be called ; Method call: $this->Method name();If there is this method in the subclass, the method in the subclass will be called. If not, the method in the parent class will be called.

parent:: in the class always calls the method in the parent class and does not call the attribute.

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