What is the difference between dynamic classes and static classes in PHP

The difference between dynamic classes and static classes in PHP: 1. Static classes are frequently used, and dynamic classes are rarely used; 2. Static classes are fast and occupy memory, while dynamic classes are relatively slower. However, releasing it immediately after the call can save memory. You can choose according to your own needs; 3. For servers with larger memory, setting it to static will improve efficiency. Compared with servers with smaller memory, the dynamic method will end redundant processes. , some memory can be recycled and released.

Operating system for this tutorial: Windows 10 system, PHP version 8.1.3, Dell G3 computer.

The difference between dynamic classes and static classes in PHP

Static methods are used throughout the entire application Stored in memory, fast, but takes up memory.

class A

  {

      public static string b()

      {

          return "Hello";

      }

  }

Usage

A.b();      //调用方便

Dynamic methods can only call methods in the class by declaring the class instance first.

class A

{

    public string b()

    {

        return "Hello";

    }

}

Usage

A  a  =  new  a();      
a.b();

Generally, static methods are used for frequently used methods, and dynamic methods are used for rarely used methods.

Static is fast and takes up memory. The dynamic speed is relatively slow, but after the call is completed, the class is released immediately, which can save memory. You can choose whether to use the dynamic method or the static method according to your own needs.

So the dynamic method will end redundant processes and can recycle and release some memory, so it is recommended to be used on servers with less memory. It is recommended to set it according to the load of the server. A more suitable value is between 5 and 10.

For servers with larger memory, setting it to static will improve efficiency. Because frequent switching of the php-fpm process will cause lag, so if the memory is large enough, the static effect will be better.

The main problem with static methods is data synchronization. If you don't save private variables in the class of your static method, then there won't be any problems. It is best to pass all the data to be operated on to the method in the form of parameters.

Static methods are class methods and do not require the creation of a class instance when called.

Dynamic methods are statically bound to subclasses, not inherited.

Static methods modify the status of the class, while dynamic methods modify the status of each object. This is also an important difference between them.

The instantiation call of a dynamic class is in the life cycle of the class Exists in the class, when the class is gone, the corresponding instance will be gone, and the corresponding method will be gone. Otherwise, as long as you reference the namespace of that static class, it will always exist until you exit the system. .

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