1. file_get_contents在指抓取的时候会出现很多问题，我以前也遇到过，不过都没有解决，后来改成了curl就没有出现这个问题了，建议你用CURL试试。

2. $url = "http://test.cc.com/test/test.jpg";
   $ch = curl_init();
   curl_setopt ($ch, CURLOPT_URL, $url);
   curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT,10);
   $str= curl_exec($ch);
   header("Content-type: text/plain");
   header("Accept-Ranges: bytes");
   header("Content-Disposition: attachment; filename="test.jpg");
   header("Cache-Control: must-revalidate, post-check=0, pre-check=0" );
   header("Pragma: no-cache" );
   header("Expires: 0" );
   exit($str);

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