Detailed explanation of PHP's public_protected_private permission control

This article introduces a detailed explanation of PHP's public_protected_private permission control. It has a certain reference value. Now I share it with everyone. Friends in need can refer to it

// Compare private, protected, public The difference between the three

/*
private protected public
In this class Y Y
Inside subclass N Y :
public can be called outside the class, and the permissions are the loosest.
protected and private cannot be called outside the class

protected can be accessed within the subclass

public and protected can be accessed within this class
*/

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