(PHP 5, PHP 7)
DOMElement::setIdAttribute — Declares the attribute specified by name to be of type ID
public DOMElement::setIdAttribute ( string $name , bool $isId ) : void
 Declares the attribute name to be of type ID. 
name
The name of the attribute.
isId
 Set it to true if you want name to be of type ID, false otherwise. 
No value is returned.
DOM_NO_MODIFICATION_ALLOWED_ERR
Raised if the node is readonly.
DOM_NOT_FOUND
 Raised if name is not an attribute of this element. 
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    https://www.php.net/manual/en/domelement.setidattribute.php