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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: bug38850.phpt</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'>--TEST--
Bug #38850 (lookupNamespaceURI does not return default namespace)
--EXTENSIONS--
dom
--FILE--
&lt;?php
$xml = &lt;&lt;&lt;HERE
&lt;?xml version=&quot;1.0&quot; ?&gt;
&lt;foo xmlns=&quot;http://www.example.com/ns/foo&quot; /&gt;
HERE;

$doc = new DOMDocument();
$doc-&gt;loadXML($xml);

$root = $doc-&gt;documentElement;

print $root-&gt;lookupNamespaceURI(NULL);


?&gt;
--EXPECT--
http://www.example.com/ns/foo
</textarea><br>  
            <input type='submit' value='Save'>  
        </form>  
        <p><a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2Fext%2Fdom%2Ftests'>🔙 Back</a></p>