How to implement a single column mode in php

How to implement a single-column mode in php: 1. Create a private variable to save the object; 2. Prohibit the use of new; 3. Prohibit cloning; 4. Determine whether the object exists; 5. Implement the single-column mode.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How does php implement a single column mode?

PHP implements a single column mode

Code:

<?php
final class Singleton
{
    //1.创建私有变量保存该对象
    private static $instance;
    //2.禁止使用new
    private function __construct(){ }
    //3.禁止克隆
    private function __clone() { }
    //4.判断对象是否存在
    public static function getInstance()
    {
        if (!self::$instanceinstanceof self) {
            self::$instance= new self();
        }
        return self::$instance;
    }
    public function test(){
        echo &#39;测试单列模式&#39;;
    }
}
$singleton = Singleton::getInstance();
$singleton->test();
//实现单列模式的意义，减少资源的占用

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