A brief analysis of the "Prototype Mode" in PHP design pattern learning

This article will take you to understand the prototype pattern of PHP design pattern, introduce the applicable scenarios, advantages and disadvantages, and implementation code. Friends who are interested can take a look at it together. I hope it will be helpful to everyone.

Prototype pattern is a type of creational pattern. Mainly for object cloning, the cloned object is called a prototype. It may be more appropriate to call the prototype mode the clone mode. Use prototype instances to specify the types of objects to create, and create new objects by copying these prototypes.

Applicable scenarios:

• When the resource overhead of the instantiated object is too high, it can be cloned directly.

• You need to create a large number of objects in a loop. Cloning is also a good choice at this time.

Advantages:

• High performance: If the process of creating an object is complicated or consumes a lot of resources, then clone it directly This process can be simplified with high performance.

• The implementation is simple. In some scenarios, compared to the various pre-operations of instantiating objects, cloning a keyword can be done.

Disadvantages:

The cloned object is not the same as the prototype object, which may be affected in some business scenarios

Code:

//抽象出来一个操作系统的类
abstract class OS {
    public $os;
    //setOS可以理解为安装操作系统
    public function installOS($os) {
        $this->os = $os;
    }

    //runOS可以理解为运行操作系统
    public function runOS() {
        return $this->os . PHP_EOL;
    }

    //__clone方法是原型模式中需要有的，尽管可能用不上
    abstract function __clone();
}


class Windows extends OS{
    public function __clone() {}
}


class Linux extends OS{
    public function __clone() {}
}


//调用端============================================
//伟大的工程师们开发好了两套操作系统
$windows = new Windows();
$linux   = new Linux();

//把它们克隆到光盘上，分别给3个用户安装。这样就不用在从零开发操作系统了，直接复制开销极小，然后把它们运行起来。
for($i = 0; $i < 3; $i ++) {
    $new_windows = clone $windows;
    $new_windows->installOS(&#39;windows&#39;);
    echo $new_windows->runOS();
}


//把它们克隆到光盘上，分别给2个用户安装。这样就不用在从零开发操作系统了，直接复制开销极小，然后把它们运行起来。
for($j = 0; $j < 2; $j ++) {
    $new_linux = clone $linux;
    $new_linux->installOS(&#39;linux&#39;);
    echo $new_linux->runOS();
}

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