根据php中父节点的属性将子句附加到xml

问题描述：

I would like to ask, how to easily append new node to the end of found node in php. Lets say I have xml like this:

<Root>
    <child id=1>
        <text>smth</text>
    </child>
</Root>

I want to find the child element with id 1 and then append another node as last. I was trying to find an answer, but it either answer how to find it, or how to write into it, unfortunately I was not able to put it together.

I would be really happy if someone can help me with this.

我想问一下，如何轻松地将新节点附加到php中找到的节点的末尾。让我们说我有这样的xml： p>

 ＆lt; Root＆gt; 
＆lt; child id = 1＆gt; 
＆lt; text＆gt; smth＆lt; / text＆gt; 
＆lt; / child＆gt  ; 
＆lt; / root＆gt; 
  code>  pre> 
 
 我想找到id为1的子元素，然后追加另一个节点作为最后一个。
我试图找到答案 ，但它要么回答如何找到它，要么如何写入它，不幸的是我无法把它放在一起。 p> 
 
 
如果有人可以帮助我，我会很高兴的 。 p> 
  div>

答

You can use the xpath to find the relevant node (based on the id) and then use the addChild to add new child-node to the node you just found:

$str =<<< END
<Root>
    <child id="1">
        <text>smth</text>
    </child>
</Root>
END;

$result = simplexml_load_string($str);

$child = $result->xpath("*[@id='1']")[0];
$child->addChild('text', 'node value');

// The part from here is only to make the output pretty-xml
// instead you can just use $result->saveXML()
$dom = new DOMDocument("1.0");
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->loadXML($result->saveXML());
var_dump($dom->saveXML());

The output will be:

string(115) "<?xml version="1.0"?>
<Root>
    <child id="1">
        <text>smth</text>
        <text>node value</text>
    </child>
</Root>
"

答

In DOM, you use Xpath to find nodes, DOMDocument::create*() to create the nodes and methods like DOMNode::appendChild() to put them into the document.

$xml =<<< END
<Root>
    <child id="1">
        <text>smth</text>
    </child>
</Root>
END;

$document = new DOMDocument("1.0");
$document->preserveWhiteSpace = false;
$document->formatOutput = true;
$document->loadXml($xml);
$xpath = new DOMXpath($document);

foreach ($xpath->evaluate('//*[@id="1"][1]') as $parentNode) {
  $parentNode
    ->appendChild($document->createElement('text'))
    ->appendChild($document->createTextNode('node value'));
}

echo $document->saveXML();

Output:

<?xml version="1.0"?>
<Root>
  <child id="1">
    <text>smth</text>
    <text>node value</text>
  </child>
</Root>

For huge XML files you can use XMLReader/XMLWriter, but you can not modify the document. You will have to read the original step by step and write a modified copy.

根据php中父节点的属性将子句附加到xml

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