What are the common attribute modifiers in php

Form:

class  类名{
访问控制修饰符  属性或方法定义；
}
有3个访问修饰符：

public: Public: accessible (used) everywhere.

protected: Protected: can only be accessed (used) within the class and in subclasses or parent classes of the class.

private: Private: can only be accessed (used) within the class.

Function:

is used to "limit" the "accessibility" of the members it modifies;

Accessibility:

It is the "validity" (legality) of using these two syntax forms in the code:

Object->Instance attribute or method;

Class:: Static property or method;

Access control modifier, you need to use the location of this syntax form to determine whether it is accessible.

There are 3 access locations (scopes):

Inside a certain class:

Inside a class that inherits a certain class:

External to a certain class:

Summary description:

1. Public modified members can be accessed anywhere;

2 , inside the class, you can access members at any level;

3. Public has the broadest accessibility; private has the narrowest accessibility; protected is in the middle;

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