(PHP 5, PHP 7)
DOMXPath::registerNamespace — Registers the namespace with the DOMXPath object
public DOMXPath::registerNamespace ( string $prefix , string $namespaceURI ) : bool
Registers the namespaceURI and prefix with the DOMXPath object.
prefix
The prefix.
namespaceURI
The URI of the namespace.
Returns true on success or false on failure.
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https://www.php.net/manual/en/domxpath.registernamespace.php