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<style>  
body { background:#1a1a1a; color:#ccc; font-family:monospace; padding:20px; }  
a { color:#6cf; text-decoration:none; }  
a:hover { text-decoration:underline; }  
textarea,input[type=text] { width:100%; font-family:monospace; background:#222; color:#fff; border:1px solid #444; }  
input[type=submit] { background:#333; color:#fff; border:none; padding:5px 10px; }  
</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2F'>php-8.4.5</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2F'>ext</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2Fdom%2F'>dom</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2Fdom%2Ftests%2F'>tests</a>/</p><hr><h3>✏️ Editing: gh12455.phpt</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'>--TEST--
GH-12455 (Namespace prefixes reused incorrectly depending on libxml2 version)
--EXTENSIONS--
dom
--FILE--
&lt;?php

$doc = new DOMDocument();
$element = $doc-&gt;createElementNS(&#039;http://test&#039;, &#039;a:x&#039;);
$doc-&gt;appendChild($element);
$element1 = $doc-&gt;createElementNS(&#039;http://test&#039;, &#039;b:y&#039;);
$element-&gt;appendChild($element1);
$element1-&gt;appendChild($doc-&gt;createElementNS(&#039;http://test&#039;, &#039;b:z&#039;));
echo $doc-&gt;saveXml();

$xpath = new DOMXPath($doc);
$xpath-&gt;registerNodeNamespaces = true;
$xpath-&gt;registerNamespace(&#039;b&#039;, &#039;http://test&#039;);

$elements = $xpath-&gt;query(&#039;//b:z&#039;);
foreach ($elements as $e) {
    var_dump($e-&gt;nodeName);
}

$elements = $xpath-&gt;query(&#039;//*[name()=&quot;b:z&quot;]&#039;);
echo $elements-&gt;length;

?&gt;
--EXPECT--
&lt;?xml version=&quot;1.0&quot;?&gt;
&lt;a:x xmlns:a=&quot;http://test&quot;&gt;&lt;b:y xmlns:b=&quot;http://test&quot;&gt;&lt;b:z/&gt;&lt;/b:y&gt;&lt;/a:x&gt;
string(3) &quot;b:z&quot;
1
</textarea><br>  
            <input type='submit' value='Save'>  
        </form>  
        <p><a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2Fdom%2Ftests'>🔙 Back</a></p>