根据php中父节点的属性将子句附加到xml

Question

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.

Answer 1

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>
"