(PHP 5, PHP 7)
DOMDocument::createAttributeNS — Create new attribute node with an associated namespace
public DOMDocument::createAttributeNS ( string $namespaceURI , string $qualifiedName ) : DOMAttr
This function creates a new instance of class DOMAttr. This node will not show up in the document unless it is inserted with (e.g.) DOMNode::appendChild().
namespaceURI
The URI of the namespace.
qualifiedName
The tag name and prefix of the attribute, as prefix:tagname.
The new DOMAttr or false if an error occurred.
DOM_INVALID_CHARACTER_ERR
Raised if qualifiedName contains an invalid character.
DOM_NAMESPACE_ERR
Raised if qualifiedName is a malformed qualified name, or if qualifiedName has a prefix and namespaceURI is null.
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https://www.php.net/manual/en/domdocument.createattributens.php