如何下载此URL的所有内容并获取json数据？

In php,

how can I download the content of this url into a json variable? url = http://www.pinnaclesports.com/League/Soccer/Serie+A/1/Lines.aspx

Here is my code:

<?php

  include_once('simple_html_dom.php');

  $serieaURL = "http://www.pinnaclesports.com/League/Soccer/Serie+A/1/Lines.aspx";

  $serieaData = file_get_contents($serieaURL);
  $json = json_encode($serieaData);

  echo $json;
?>

All I get with this is: "

I have no idea of what this means, even googling that leaves me with doubts.

Where am I going wrong here?

Ty