(PHP 5, PHP 7, PHP 8)
DOMElement::removeAttributeNode — Removes attribute
   Removes attribute attr from the element.
  
attrThe attribute node.
   成功时返回 true, 或者在失败时返回 false。
  
DOM_NO_MODIFICATION_ALLOWED_ERRRaised if the node is readonly.
DOM_NOT_FOUND_ERROR
       Raised if attr is not an attribute of the element.