xml - PHP DOMNode insertAfter? -

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i bit stuck on how reorder nodes. trying add 2 simple "move item up" , "move item down" functions. while insertbefore() want move sibling before preceding one, easiest way move 1 node down in dom? appreciated!

code example:

 try {         $li->parentnode->insertbefore( $ul, $li->nextsibling);  } catch(\exception $e){         $li->parentnode->appendchild( $ul );  }

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