How to define class constants in PHP (with code)

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Definition of class constants

Constants defined in a class.

Class constants must be defined using the const keyword

const constant name = value;

The relationship between constants and objects

Constants cannot be accessed through objects

Access to class constants

##Class constants belong to the class, not to the object. Objects cannot access class constants.

Constant access must be implemented through classes:

Class name::Constant name

:: is called the range resolution operator

Classes are often used inside a class to access members of the class. When using a class to access members inside the class, there is a keyword similar to $this that represents the object: self, its own meaning, represents the current class name.

<?php
class person(){
    const HAOYUN=&#39;PHP软件开发工程师&#39;;
}
//类外部获取
$person=new person();
echo $person->HAOYUN;
echo HAOYUN;
echo person::HAOYUN;
//类内部获取

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