PHP design pattern singleton pattern

The content of this article is about the singleton mode of PHP design pattern, which has certain reference value. Now I share it with you. Friends in need can refer to it

Single case mode ( Singleton) is also one of the creative modes, and it is not difficult to understand.
After reading some information, the most basic application is the task manager.
In fact, my personal understanding is that cannot create a second identical object.

The program will internally determine whether the object has been created. If not, create it. If it already exists, use it directly.

Made some simple records, as follows:

hero = "诸葛亮";  
echo "single1创建的英雄为:{$single1->hero}
";    
  
// 第二次调用实例化对象变量方法 程序会判断出对象已经创建过，直接使用。  
$single2 = Singleton::getInstance();    
// 给hero赋值为 周瑜，会直接覆盖第一次的诸葛亮  
$single2->hero = "周瑜";    
  
echo "single1创建的英雄为:{$single1->hero}
";    
  
echo "single2创建的英雄为:{$single2->hero}
";


##The output result is: 
 The hero created by single1 is: Zhuge Liang
The hero created by single1 is: Zhou Yu
The hero created by single2 is: Zhou Yu
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