(PHP 5, PHP 7)
DOMElement::getAttributeNS — Returns value of attribute
public DOMElement::getAttributeNS ( string $namespaceURI , string $localName ) : string
Gets the value of the attribute in namespace namespaceURI with local name localName for the current node.
namespaceURI
The namespace URI.
localName
The local name.
The value of the attribute, or an empty string if no attribute with the given localName and namespaceURI is found.
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https://www.php.net/manual/en/domelement.getattributens.php