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    <p>I guess the people suggesting to use <a href="http://code.google.com/p/simpledom/" rel="nofollow noreferrer">SimpleDOM</a> would be me. :)</p> <p>I've written SimpleDOM::sort() exactly for that situation, because in order to sort SimpleXMLElements by an arbitration expression (or arbitrary expressions) you need to use <a href="http://docs.php.net/manual/en/function.array-multisort.php" rel="nofollow noreferrer"><code>array_multisort()</code></a> which is boring and won't teach you anything useful.</p> <p>Here's the short version of how it works: first you create a proxy array of key=>value pairs corresponding to each SimpleXMLElement and the value with which they'll be sorted. In your example, if you want to sort them by <code>&lt;age/&gt;</code>, the array would be <code>array(21, 56)</code>. Then you call <code>array_multisort()</code> with the "proxy array" as first argument, followed by any number of <a href="http://docs.php.net/manual/en/array.constants.php" rel="nofollow noreferrer">sorting modifiers</a> such as SORT_DESC or SORT_NUMERIC then finally the array you want to sort, which will be passed by reference.</p> <p>You will end up with something like that:</p> <pre><code>$nodes = array( new SimpleXMLElement('&lt;person&gt;&lt;name&gt;Andrew&lt;/name&gt;&lt;age&gt;21&lt;/age&gt;&lt;/person&gt;'), new SimpleXMLElement('&lt;person&gt;&lt;name&gt;Beth&lt;/name&gt;&lt;age&gt;56&lt;/age&gt;&lt;/person&gt;') ); function xsort(&amp;$nodes, $child_name, $order = SORT_ASC) { $sort_proxy = array(); foreach ($nodes as $k =&gt; $node) { $sort_proxy[$k] = (string) $node-&gt;$child_name; } array_multisort($sort_proxy, $order, $nodes); } xsort($nodes, 'name', SORT_ASC); print_r($nodes); xsort($nodes, 'age', SORT_DESC); print_r($nodes); </code></pre> <p>But really, instead of burdening yourself with more code you'll have to maintain and possibly ending up rewriting <code>array_multisort()</code> in userspace, you should leverage existing solutions. There's nothing interesting in such a sorting algorithm/routine, your time would be better spent on something that doesn't already exist.</p>
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    1. COWell heck Josh, you are persistent! I suppose I will give it a try as it would allow me to move on to the next stumbling block and I could probably use it in other places on this project.
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    2. COI'm not presistent, only consistent in advocating for code reuse. If the snippet I posted above works for you then by all mean please use that. Or use closures if you prefer, whatever works for you. As you said, your goal is to find a solution that will allow you to move on to the next stumbling block and won't require you to look back later.
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    3. COThat "persistent" was meant to be complimentary. I'm sold on SimpleDOM. It just works. Fast. Great stuff, Josh.
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