nefunkční nodeValue

<?php
$i = 1;
while ($i <= 66) {
  $html = new DOMDocument();
  @$html->loadHtmlFile('http://example.com'.$i.'/');
  $xpath = new DOMXPath( $html );
  $nodelist = $xpath->query( "//div[@class='skola']//a/@href" );
  foreach ($nodelist as $n){
    $html2 = new DOMDocument();
    @$html2->loadHtmlFile('http://example.com'.$n->nodeValue);
    $xpath2 = new DOMXPath( $html2 );
    $nodelist2 = $xpath2->query( "//td[@id='detail-hwww']//a/@href" );
    foreach ($nodelist2 as $n2){
      echo $n2->nodeValue.";";
      $html3 = new DOMDocument();
      @$html3->loadHtmlFile('http://example.com'.$n->nodeValue);
      $xpath3 = new DOMXPath( $html2 );
      $nodelist3 = $xpath3->query( "//table[@id='udaje']//a/@href" );
      foreach ($nodelist3 as $n3){
        $mail = explode( ':' , $n3->nodeValue);
        if ($mail[0] <> "mailto"){
          echo $n3->nodeValue.";";
        }
      }
    }
  }
  $i++;
}
?>

while ($i<=10)
{
        echo $i ;
        sleep(2200);
        $i++;
}