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    <p>While <a href="http://de.php.net/manual/en/book.simplexml.php" rel="nofollow noreferrer">SimpleXML</a> provides <a href="https://stackoverflow.com/a/16062633/367456">a way to remove</a> XML nodes, its modification capabilities are somewhat limited. One other solution is to resort to using the <a href="http://de.php.net/manual/en/book.dom.php" rel="nofollow noreferrer">DOM</a> extension. <a href="http://de.php.net/manual/en/function.dom-import-simplexml.php" rel="nofollow noreferrer">dom_import_simplexml()</a> will help you with converting your <code>SimpleXMLElement</code> into a <code>DOMElement</code>.</p> <p>Just some example code (tested with PHP 5.2.5):</p> <pre><code>$data='&lt;data&gt; &lt;seg id="A1"/&gt; &lt;seg id="A5"/&gt; &lt;seg id="A12"/&gt; &lt;seg id="A29"/&gt; &lt;seg id="A30"/&gt; &lt;/data&gt;'; $doc=new SimpleXMLElement($data); foreach($doc-&gt;seg as $seg) { if($seg['id'] == 'A12') { $dom=dom_import_simplexml($seg); $dom-&gt;parentNode-&gt;removeChild($dom); } } echo $doc-&gt;asXml(); </code></pre> <p>outputs</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;data&gt;&lt;seg id="A1"/&gt;&lt;seg id="A5"/&gt;&lt;seg id="A29"/&gt;&lt;seg id="A30"/&gt;&lt;/data&gt; </code></pre> <p>By the way: selecting specific nodes is much more simple when you use XPath (<a href="http://de.php.net/manual/en/function.simplexml-element-xpath.php" rel="nofollow noreferrer">SimpleXMLElement->xpath</a>): </p> <pre><code>$segs=$doc-&gt;xpath('//seq[@id="A12"]'); if (count($segs)&gt;=1) { $seg=$segs[0]; } // same deletion procedure as above </code></pre>
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    1. USStefan Gehrig
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    1. COThanks for this - initially I was inclined to avoid this answer since I wanted to avoid using DOM. I tried several other answers which did not work, before finally trying yours - which worked flawlessly. To anyone considering avoiding this answer, try it out first and see if it doesn't do exactly what you want. I think what threw me off was I didn't realize dom_import_simplexml() still works with the same underlying structure as the simplexml, so any changes in one immediately effect the other, no need to write/read or reload.
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      1. USdimo414
    2. CONote that this code will only remove the first element encountered. I suspect that this is because modifying the data while it's under iteration invalidates the iterator position, thus causing the foreach loop to terminate. I solved this by saving the dom-imported nodes to an array which I then iterated through to perform the deletion. Not a great solution, but it works.
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      1. USRyan Ballantyne
    3. COYou can actually delete SimpleXML elements using unset, see posthy's answer for a solution.
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      1. USFrançois Feugeas
 

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