프로토타입 모드의 용도는 무엇입니까?

<?php
//定义原型类接口
interface prototype{
public function copy();
}
//一个具体的业务类并实现了prototype 接口
//以一个文本的读写操作类为例
class text implements prototype{
private $_fileUrl;
public function __construct($fileUrl){
$this->_fileUrl = $fileUrl;
}
public function write($content){
file_put_contents($this->_fileUrl, $content);
}
public function read(){
return file_get_contents($this->_fileUrl);
}
public function copy(){
return clone $this;
}
/* 可以使用php的__clone() 函数完成深度克隆 */
public function __clone(){
echo &#39;clone...&#39;;
}
}
$texter1 = new text(&#39;1.txt&#39;);
$texter1->write(&#39;test...&#39;);
//获得一个原型
$texter2 = $texter1->copy();
echo $texter2->read();