The function of const keyword in php

This article mainly introduces "the function of the const keyword in php". In the daily operation, I believe that many people have doubts about the function of the const keyword 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 the function of the const keyword in php. Next, please follow the editor to study!

Defining constants in PHP is done by calling the define () function, but to define member properties in a class as constants, you can only use the const keyword.

Like static members, it is accessed through the class name or using the self keyword in the member method, and cannot be accessed with an object.

Don't add $before using constant names declared by const, and constant names are usually capitalized.

The result of the code running is two ABC

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