PHP深度克隆对象 [英] PHP deep clone object

问题描述

场景:从数据库中获取电子邮件模板，并遍历收件人列表，为每个收件人个性化电子邮件.

The scenario: fetch an email template from the database, and loop through a list of recipients, personalising the email for each.

我的电子邮件模板作为嵌套对象返回.它可能看起来像这样:

My email template is returned as a nested object. It might look a little like this:

object(stdClass) {
    ["title"] => "Event Notification"
    ["sender"] => "[e-mail]"
    ["content"] => object(stdClass) {
        ["salutation"] => "Dear %%firstname%%,"
        ["body"] => "Lorem ipsum %%recipient_email%% etc etc..."
    }
}

然后我遍历收件人，将此$ email对象传递给personalise()函数:

Then I loop through the recipients, passing this $email object to a personalise() function:

foreach( $recipients as $recipient ){
    $email_body = personalise( $email, $recipient );
    //send_email();
}

当然，问题是我需要通过引用传递$ email对象，以便替换个性化标签-但是，如果这样做，原始对象将被更改，不再包含个性化标签.

The issue, of course, is that I need to pass the $email object by reference in order for it to replace the personalisation tags - but if I do that, the original object is changed and no longer contains the personalisation tags.

据我了解，克隆在这里无济于事，因为它只会创建一个浅表副本:电子邮件对象内部的内容对象不会被克隆.

As I understand, clone won't help me here, because it'll only create a shallow copy: the content object inside the email object won't be cloned.

我已经读过关于用unserialize(serialize($ obj))解决这个问题的知识-但是我读到的所有内容都说这对性能有很大的影响.

I've read about getting round this with unserialize(serialize($obj)) - but everything I've read says this is a big performance hit.

所以，两个人终于回答了我两个问题:

So, two finally get to my two questions:

1. 在这里unserialize(serialize($ obj))是一个合理的解决方案吗?
2. 还是我要把这件事弄错了?我有另一种方式吗 可以生成该电子邮件对象的个性化副本?

1. Is unserialize(serialize($obj)) a reasonable solution here?
2. Or am I going about this whole thing wrong? Is there a different way that I can generate personalised copies of that email object?

推荐答案

您可以添加 __clone() 方法发送到您的电子邮件类别.通过clone()克隆此类的实例时，将自动调用该方法.然后，您可以使用这种方法手动添加模板.

You could add a __clone() method to your email class. Which is automatically called when an instance of this class is cloned via clone(). In this method you can then manually add the template.

示例:

class email {
    __clone() {
         $this->template = new template();
    }
}

.

unserialize(serialize($object)); // would be another solution...

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