PHP DOMDocument replace DOMElement child with HTML string

Question

Using PHP I\'m attempting to take an HTML string passed from a WYSIWYG editor and replace the children of an element inside of a preloaded HTML document with the new HTML.

Answer 1

If the HTML string can be parsed as XML, you can do this (after clearing the element of all child nodes):

$fragment = $doc->createDocumentFragment();
$fragment->appendXML($html_string);
$element->appendChild($fragment);

If $html_string cannot be parsed as XML, it will fail. If it does, you’ll have to use loadHTML(), which is less strict — but it will add elements around the fragment which you will have to strip.

Unlike PHP, Javascript has the innerHTML property which allows you to do this very easily. I needed something like it for a project so I extended PHP’s DOMElement to include Javascript-like innerHTML access.

With it you can access the innerHTML property and change it just as you would in Javascript:

echo $element->innerHTML;
$elem->innerHTML = 'example';

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Source: http://www.keyvan.net/2012/11/php-domdocument-replace-domelement-child-with-html-string/