(PHP 5, PHP 7)
DOMNode::lookupNamespaceUri — Gets the namespace URI of the node based on the prefix
public DOMNode::lookupNamespaceUri ( string $prefix ) : string
 Gets the namespace URI of the node based on the prefix. 
prefix
The prefix of the namespace.
The namespace URI of the node.
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    https://www.php.net/manual/en/domnode.lookupnamespaceuri.php