The use of object-oriented static method properties and constants

1. Static methods are functions that use classes as scopes, static methods cannot access normal properties in the class, and static properties can be accessed.
   

2. We cannot invoke static methods in objects, and static methods and properties are also known as class methods and properties.

3. A static method can be called anywhere the class can access it, and every instance of the class can access a static property, and the static properties and methods are accessible without the need for an instance object.

4. Constants declare a constant property with the keyword const to contain only the base data type.
   

The use of object-oriented static method properties and constants