无法从XML文档(PHP)中删除所有子项

无法从XML文档中删除所有子项

<?xml version="1.0" encoding="UTF-8"?>
    <routes>
      <route name="admin" />
      <!---->
      <route name="blog" bla bla/>
      <route name="blog" bla bla/>
      <route name="blog" bla bla/>
    </routes>

$xml = simplexml_load_file('routes.xml');

    $dom_sxe = dom_import_simplexml($xml);
    $dom = new \DOMDocument('1.0');
    $dom_sxe = $dom->importNode($dom_sxe, true);
    $dom_sxe = $dom->appendChild($dom_sxe);


    foreach ($dom->getElementsByTagName('route') as $route)
    {
        if($route->getAttribute('name') === 'blog')
        {

            $route->parentNode->removeChild($route);
            echo $route->getAttribute('name');
        }
    }

    echo $dom->saveXML();

仅删除具有该属性的2个元素 博客