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copied!<p>With the <a href="http://de.php.net/manual/en/book.dom.php" rel="nofollow noreferrer">DOM extension</a> it should be something like this:</p> <pre><code>$dom = new DOMDocument; $dom->validateOnParse = TRUE; $dom->loadXML($xmlString); // or use ->load('file.xml') $node = $dom->getElementById('foo'); echo $node->nodeValue; </code></pre> <p>See the manual on</p> <ul> <li><a href="http://de.php.net/manual/en/domdocument.getelementbyid.php" rel="nofollow noreferrer"><code>DOMDocument::getElementById</code></a> — Searches for an element with a certain id</li> </ul> <hr> <p>If it doesn't work with <code>getElementById</code> (which usually only happens if the DTD doesn't know the id attribute), you can still use <a href="http://de.php.net/manual/en/class.domxpath.php" rel="nofollow noreferrer">XPath</a> to do the query:</p> <pre><code>$xpath = new DOMXPath($dom); $nodes = $xpath->query('//Message[@id = "foo"]'); foreach($nodes as $node) { echo $node->nodeValue; } </code></pre> <p>Unlike <code>getElementById</code>, an <a href="http://de.php.net/manual/en/domxpath.query.php" rel="nofollow noreferrer">XPath query</a> always returns a <a href="http://de.php.net/manual/en/class.domnodelist.php" rel="nofollow noreferrer"><code>DOMNodeList</code></a>. It will be empty if the query didn't find any nodes.</p> <hr> <p>If the ID is a real XML ID, you can also use the id() function in XPath</p> <pre><code>$xpath = new DOMXPath($dom); $nodes = $xpath->query('id("foo")'); foreach($nodes as $node) { echo $node->nodeValue; } </code></pre> <p>See <a href="https://stackoverflow.com/questions/3405117/simplify-php-dom-xml-parsing-how/3405651#3405651">Simplify PHP DOM XML parsing - how?</a> for more details on XML IDs.</p>

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