A brief talk on the scope of access modifiers private, protected and public in PHP _php instance

1, private only in the class internal use

2. Protected can be used within classes and in inheriting classes. Cannot use "that is, an instantiated object cannot invoke" from outside the class

3, public all scope applies.

4. When a subclass modifies a method in the parent class, the access modifier in the subclass is greater than or equal to the parent class. Inheritance can only flourish, at least unchanged. You can't lose something. 】

The above article on the access modifier in PHP private, protected, public role is small to share all the content of the whole, I hope to give you a reference, but also hope that we support the cloud habitat community.