How to use double colons in php

This article mainly introduces "how to use double colons in php". In daily operation, I believe many people have doubts about how to use double colons in php. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use double colons in php". Next, please follow the editor to study!

In PHP, a double colon refers to a scoping operator that can be used to access static members, that is, to represent a class as a variable, and then use a double colon to access static members outside the class. The syntax is "test::$ static property" or "test:: static method".

This article operating environment: Windows10 system, PHP7.1 version, Dell G3 computer.

What is the use of double colons in php

Double colon operator: that is, the scoping operator Scope Resolution Operator can access properties and methods overridden in static, const, and classes.

1. Access static members with variables

In fact, it is to use variables to represent the class, and then use double colons to access the static members outside the class.

Change the class name to $SELF when you visit yourself, for example:

two。 Access with parent

The method that accesses the parent class.