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PHP - 使用简单 XML 复制 XML 节点

发布于 2024-08-23 16:54:46 字数 72 浏览 7 评论 0原文

我需要使用简单 XML 加载 XML 源，复制现有节点及其所有子节点，然后在渲染 XML 之前自定义此新节点的属性。有什么建议吗？

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与之呼应 2024-08-30 16:54:46

SimpleXML 无法做到这一点，因此您必须使用 DOM 。好消息是 DOM 和 SimpleXML 是同一枚硬币 libxml 的两个侧面。因此，无论您使用的是 SimpleXML 还是 DOM，您都在处理同一棵树。下面是一个示例：

$thing = simplexml_load_string(
    '<thing>
        <node n="1"><child/></node>
    </thing>'
);

$dom_thing = dom_import_simplexml($thing);
$dom_node  = dom_import_simplexml($thing->node);
$dom_new   = $dom_thing->appendChild($dom_node->cloneNode(true));

$new_node  = simplexml_import_dom($dom_new);
$new_node['n'] = 2;

echo $thing->asXML();

如果您经常做此类事情，可以尝试 SimpleDOM ，它是 SimpleXML 的扩展，允许您直接使用 DOM 的方法，而无需在 DOM 对象之间进行转换。

include 'SimpleDOM.php';
$thing = simpledom_load_string(
    '<thing>
        <node n="1"><child/></node>
    </thing>'
);

$new = $thing->appendChild($thing->node->cloneNode(true));
$new['n'] = 2;

echo $thing->asXML();

SimpleXML can't do this, so you'll have to use DOM. The good news is that DOM and SimpleXML are two sides of the same coin, libxml. So no matter whether you're using SimpleXML or DOM, you're working on the same tree. Here's an example:

$thing = simplexml_load_string(
    '<thing>
        <node n="1"><child/></node>
    </thing>'
);

$dom_thing = dom_import_simplexml($thing);
$dom_node  = dom_import_simplexml($thing->node);
$dom_new   = $dom_thing->appendChild($dom_node->cloneNode(true));

$new_node  = simplexml_import_dom($dom_new);
$new_node['n'] = 2;

echo $thing->asXML();

If you're doing that kind of thing a lot, you can try SimpleDOM, which is an extension to SimpleXML that lets you use DOM's methods directly, without converting from and to DOM objects.

include 'SimpleDOM.php';
$thing = simpledom_load_string(
    '<thing>
        <node n="1"><child/></node>
    </thing>'
);

$new = $thing->appendChild($thing->node->cloneNode(true));
$new['n'] = 2;

echo $thing->asXML();

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滥情哥ㄟ 2024-08-30 16:54:46

对于 SimpleXML，我发现的最好方法是解决方法。它很漂亮，但它有效：

// Strip it out so it's not passed by reference
$newNode = new SimpleXMLElement($xml->someNode->asXML());

// Modify your value
$newNode['attribute'] = $attValue;

// Create a dummy placeholder for it wherever you need it
$xml->addChild('replaceMe');

// Do a string replace on the empty fake node
$xml = str_replace('<replaceMe/>',$newNode->asXML(),$xml->asXML());

// Convert back to the object
$xml = new SimpleXMLElement($xml); # leave this out if you want the xml

因为它是 SimpleXML 中似乎不存在的功能的解决方法，所以您需要注意，我预计这会破坏您到目前为止定义的任何对象引用，如果有的话。

With SimpleXML, the best way I've found is a workaround. It's pretty bobo, but it works:

// Strip it out so it's not passed by reference
$newNode = new SimpleXMLElement($xml->someNode->asXML());

// Modify your value
$newNode['attribute'] = $attValue;

// Create a dummy placeholder for it wherever you need it
$xml->addChild('replaceMe');

// Do a string replace on the empty fake node
$xml = str_replace('<replaceMe/>',$newNode->asXML(),$xml->asXML());

// Convert back to the object
$xml = new SimpleXMLElement($xml); # leave this out if you want the xml

Since it's a workaround for a feature that doesn't seem to be there in SimpleXML, you'll need to be aware that I expect this would break any object references you've defined up to this point, if any.

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