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@ 2014-08-12T23:15:39Z

<?php

$dom = new DOMDocument();
$dom->loadXml('<foo xmlns=urn:foo/>');

var_dump($dom->documentElement->lookupNamespaceURI(NULL));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

43.43 ms | 403 KiB | 5 Q