I can't get url's html content which is in

Question

function pageContent(String $url): \DOMDocument
        {
            $html = cache()->rememberForever($url, function () use ($url) {
                return file_get_contents($url);
            });
            $parser = new \DOMDocument();
            libxml_use_internal_errors(true);
            $parser->loadHTML($html);
            libxml_use_internal_errors(false);

            return $parser;
        }

$linkBox is holding a website array which is like this: array(3) {

  [0]=>
  string(34) "https://lions-mansion.jp/MF161026/"
  [1]=>
  string(34) "https://lions-mansion.jp/MF171045/"
  [2]=>
  string(34) "https://lions-mansion.jp/MF171010/" 
}

So with foreach I try to go inside the links but I couldn't.

 foreach ($linkBox as $box){
        $content = pageContent($box);
        foreach ($content as $xpathgo){
            $Pars = new \DOMXPath($xpathgo);
            $Route = $Pars->query("//ul[@id='snav']/li/a");
            foreach ($Route as $Rot){
                $get = $Rot->getAttribute('href');
            }
        }
    }

    var_dump($get);

It returns nothing. Any idea, what the problem is? Thank you for helping!