Getting zipped XML files(accommodation.xml.zip) with curl PHP

I have used and tried below code for getting the xml file from FTP server, Actually that xml file is zipped as accommodation.xml.zip. So that I couldn't get that xml file using curl() in php

$url_method = "http://ift.tt/1BGdOE7";
$username = "test";
$pwd = "test";

   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url_method);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt($ch, CURLOPT_USERPWD, "$username:$pwd");    
   $xmlcontent = gzdecode ( curl_exec($ch) ); 
   curl_close($ch);
   print_r($xmlcontent);

By using this code, I have got below error: ////////////////////////// Severity: Warning

Message: gzdecode(): data error

Filename: controllers/cron.php

Line Number: 438 /////////////////////////

But when I try to use the ftp url in browser, that zip file has downloaded.

Can anyone help me to get the xml file using curl() without error ?