Analysis of core principles based on PHP static classes

In PHP, a static class is a special type of class that has some unique characteristics and behavior. This article will analyze the principles of PHP static classes in detail and provide corresponding source code examples.

What is a static class?
A static class means that the members (properties and methods) in the class will not change during the instantiation process of the class. They are class-level members, not instance-level members. In other words, no matter how many instances of a class are created, there is only one copy of the static members.

Static Properties
First, let's look at static properties. Static properties are class-level properties that are used to store class-related data. Static properties are declared using the keyword in the class definition staticand can only be accessed through the class name, not through instances of the class.

Here is a sample code that demonstrates how to define and use static properties:

class Counter {
   
    
    
    public static $count = 0;

    public fun