(PHP 5, PHP 7, PHP 8)
DOMElement::setAttributeNodeNS — Adds new attribute node to element
Adds new attribute node attr to element, keeping the namespace into account.
If an attribute with the same name already exists on the element, that attribute is replaced by attr.
attrThe attribute node.
Returns the old attribute if it has been replaced or null if there was no old attribute.
If a DOM_WRONG_DOCUMENT_ERR error is raised, and strictErrorChecking is false, false is returned.
DOM_WRONG_DOCUMENT_ERR
Raised if attr belongs to a different document than the element.