php dom preg-replace domdocument dom-node

DOMElement replace HTML value

I have this HTML string in a DOMElement:

<h1>Home</h1>
test{{test}}

I want to replace this content in a way that only

<h1>Home</h1>
test

remains (so I want to remove the {{test}}).

At this moment, my code looks like this:

$node->nodeValue = preg_replace(
    '/(?<replaceable>{{([a-z0-9_]+)}})/mi', '' , $node->nodeValue);

This doesn't work because nodeValue doesn't contain the HTML value of the node. I can't figure out how to get the HTML string of the node other than using $node->C14N(), but by using C14N I can't replace the content. Any ideas how I can remove the {{test}} in an HTML string like this?

Solution

Have you tried the DOMDocument::saveXML function? (http://php.net/manual/en/domdocument.savexml.php)

It has a second argument $node with which you can specify which node to print the HTML/XML of.

So, for example:

<?php

$doc = new DOMDocument('1.0');
// we want a nice output
$doc->formatOutput = true;

$root = $doc->createElement('body');
$root = $doc->appendChild($root);

$title = $doc->createElement('h1', 'Home');
$root->appendChild($title);

$text = $doc->createTextNode('test{{test}}');
$text = $root->appendChild($text);

echo $doc->saveXML($root);

?>

This will give you:

<body>
  <h1>Home</h1>
  test{{test}}
</body>

If you do not want the <body> tag, you could cycle through all of its childnodes:

<?php

foreach($root->childNodes as $child){    
    echo $doc->saveXML($child);
}

?>

This will give you:

<h1>Home</h1>test{{test}}

Edit: you can then of course replace {{test}} by the regex that you are already using:

<?php

$xml = '';
foreach($root->childNodes as $child){    
    $xml .= preg_replace(
                '/(?<replaceable>{{([a-z0-9_]+)}})/mi', '', 
                $doc->saveXML($child)
    );
}

?>

This will give you:

<h1>Home</h1>test

Note: I haven't tested the code, but this should give you the general idea.