试图读取实时rss，但返回相同的xml

我正在尝试从"http://synd.cricbuzz.com/score-gadget/gadget-scores-feed.xml"我理解它的缓存问题，所以我没有添加缓存，但仍然返回相同的文件：（

<?php 
    header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
    header("Cache-Control: no-store, no-cache, must-revalidate");
    header("Pragma: no-cache"); Header('Pragma: no-cache');
    $url = "http://synd.cricbuzz.com/score-gadget/gadget-scores-feed.xml";
    $curl = curl_init();
    curl_setopt ($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $result = curl_exec ($curl);
    curl_close ($curl);
    print $result;
    $fp = fopen('score.xml', 'w');
    if($fp)
        fwrite($fp,  $result);  
    else
    echo "Error !";
    $url = "score.xml";
    $xml = simplexml_load_file($url);
    var_dump($xml);
 ?>