Explanation of PHP singleton mode (code example)

This article brings you an explanation (code example) about the PHP singleton mode. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The singleton pattern is a commonly used design pattern and can be seen in many frameworks. The singleton mode can ensure that there is only one instance of a class, thereby facilitating control of the number of instances and saving system resources.

      
The singleton pattern may be used multiple times in a system. For easier creation, you can try to establish a general abstraction:
      
// SingletonFacotry.php 
      
// A.php num++; var_dump($obj1->num); // 1 $obj2 = A::getInstance(); $obj2->num++; var_dump($obj2->num); // 2
      

      
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