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POUsing DOMXPath to replace a node while maintaining its position
 

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    <p>Ok, so I had this neat little idea the other night to create a helper class for DOMDOCUMENT that mimics, to some extent, jQuery's ability to manipulate the DOM of an HTML or XML-based string. Instead of css selectors, XPath is used. For example:</p> <pre><code>$Xml-&gt;load($source) -&gt;path('//root/items') -&gt;each(function($Context) { echo $Context-&gt;nodeValue; }); </code></pre> <p>This would invoke a callback function on every resulting node. Unfortunately, PHP version &lt; 5.3.x doesn't support lambda functions or closures, so I'm forced to do something a bit more like this for the time being:</p> <pre><code>$Xml-&gt;load($source) -&gt;path('//root/items') -&gt;walk('printValue', 'param1', 'param2'); </code></pre> <p>Everything is working great at the moment and I think this project would be useful to a lot of people, but I'm stuck with one of the functions. I am attempting to mimic jQuery's 'replace' method. Using the following code, I can accomplish this quite easily by applying the following method:</p> <pre><code>$Xml-&gt;load($source) -&gt;path('//root/items') -&gt;replace($Xml-&gt;createElement('foo', 'bar')); // can be an object, string or XPath pattern </code></pre> <p>The code behind this method is:</p> <pre><code>public function replace($Content) { foreach($this-&gt;results as $Element) { $Element-&gt;parentNode-&gt;appendChild($Content-&gt;cloneNode(true)); $Element-&gt;parentNode-&gt;removeChild($Element); } return $this; } </code></pre> <p>Now, this works. It replaces every resulting element with a cloned version of $Content. The problem is that it adds them to the bottom of the parent node's list of children. The question is, how do I clone this element to replace other elements, while still retaining the original position in the DOM?</p> <p>I was thinking about reverse-engineering the node I was to replace. Basically, copying over values, attributes and element name from $Content, but I am unable to change the actual element name of the target element.</p> <p>Reflection could be a possibility, but there's gotta be an easier way to do this.</p> <p>Anybody?</p>
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