How to define class constants in PHP (with code)

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Definition of a class constant

A constant defined inside a class.

Class constants must be defined with the Const keyword

Const constant NAME = value;

The relationship of constants to objects

Constants cannot be accessed through objects

access to class constants

A class constant belongs to a class and not to an object. object is not accessible to class constants.

Constant access must be achieved through the class:

Class Name:: Constant Name

:: Called Range resolution operator

There is a constant use of classes within the class to access the members of the class, when the class is accessed internally using the class, there is a keyword similar to $this that represents the object: self, its own meaning, represents the current class name

<?phpclass person () {    const haoyun= ' PHP software Development Engineer ';} Get $person=new person () from outside the class, echo $person->haoyun;echo Haoyun;echo person::haoyun;//class internal get