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<?php $dom = new DOMDocument(); $dom->loadXml('<foo xmlns="urn:foo"/>'); var_dump($dom->documentElement->lookupNamespaceUri(NULL)); var_dump($dom->documentElement->lookupNamespaceUri('' || NULL)); var_dump('' || NULL);
Output for git.master, git.master_jit, rfc.property-hooks
string(7) "urn:foo" NULL bool(false)

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