克隆不为我工作吗? [英] Clone is not working for me?

问题描述

我有一个类ClassDummy的对象$objDummy，另一个是

I have an object $objDummy of some class ClassDummy and another is as

$objClone = clone $objDummy;

然后我在$objClone中进行任何更改，$objDummy也进行了更改. 我不想那样做. 我怎样才能使它正常工作?

Then I make any change in $objClone, $objDummy is also changed. I do not want to do that. How can I get this to work?

作为对克里斯的回应. 这是一个例子

In response to Chris. Here is an example

<?php
class myAnotherObject{
    public $myAnotherVar =10;
}

class myObject {
    public $myVar = false;
    function __construct() {
        $this->myVar = new myAnotherObject();
    }
}


$nl = "\n";
//*
$nl = '<br />';
//*/


$obj1 = new myObject();
echo 'obj1->myVar->myAnotherVar: '.$obj1->myVar->myAnotherVar;

$obj2 = clone $obj1;

echo $nl.'obj1->myVar->myAnotherVar: '.$obj1->myVar->myAnotherVar.', obj2->myVar->myAnotherVar: '.$obj2->myVar->myAnotherVar;

$obj2->myVar->myAnotherVar = 20;
echo $nl.'obj1->myVar->myAnotherVar: '.$obj1->myVar->myAnotherVar.', obj2->myVar->myAnotherVar: '.$obj2->myVar->myAnotherVar;

输出为

obj1->myVar->myAnotherVar: 10
obj1->myVar->myAnotherVar: 10, obj2->myVar->myAnotherVar: 10
obj1->myVar->myAnotherVar: 20, obj2->myVar->myAnotherVar: 20

推荐答案

您是否正在实现__clone()方法? 有关克隆的PHP文档中的示例将比我可能更好地解释这一点.能够.特别是您对这部分感兴趣，

Are you implementing the __clone() method? The examples in the PHP documentation on cloning will explain this better than I possibly can. Specifically you're interested in this part,

克隆对象后，PHP 5将 对所有 对象的属性.任何属性 指其他 变量，将保留引用.

When an object is cloned, PHP 5 will perform a shallow copy of all of the object's properties. Any properties that are references to other variables, will remain references.

克隆完成后，如果 定义__clone()方法，然后定义新创建的对象的__clone() 方法将被调用，以允许任何 需要的必要属性 改变了.

Once the cloning is complete, if a __clone() method is defined, then the newly created object's __clone() method will be called, to allow any necessary properties that need to be changed.

更新
根据对问题的更新，您确实缺少__clone()的实现.由于myObject的$myVar成员本身就是一个对象，因此您也需要对其进行克隆.这是您的myObject类的外观，

UPDATE
Based on your update to the question, you're indeed missing the implementation of __clone(). Since the $myVar member of myObject is itself an object, you need to clone that as well. Here's what your myObject class should look like,

class myObject {
    public $myVar = false;
    function __construct() {
        $this->myVar = new myAnotherObject();
    }

    function __clone() {
        $this->myVar = clone $this->myVar;
    }
}

输出将变为以下内容，

obj1->myVar->myAnotherVar: 10
obj1->myVar->myAnotherVar: 10, obj2->myVar->myAnotherVar: 10
obj1->myVar->myAnotherVar: 10, obj2->myVar->myAnotherVar: 20

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