Curl (can't hide output) - php

Question

i maked this function:
function makeRequest($url,$browser,$ip,$cookie = false,$referrer = null)
{
if($referrer==null)
{
$refferer = 'http://google.com';
}
$headers = array();
$headers[] = "HTTP_X_FORWARDED_FOR: ".$ip;
$headers[] = "X_FORWARDED_FOR: ".$ip;
$headers[] = "REMOTE_ADDR:". $ip;
$headers[] = "REFERRER: ".$referrer;
$headers[] = $browser;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_COOKIESESSION, true );
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
if($cookie!==false)
{
curl_setopt($ch, CURLOPT_COOKIE, $cookie);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_VERBOSE, 0);
curl_setopt($ch, CURLOPT_HEADER, false);
}
else
{
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
}
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_REFERER, $referrer);
if($cookie==false)
{
$return = curl_exec($ch);
}
else
{
$return = 'hidden content';
curl_exec($ch);
}
curl_close($ch);
return $x;
}
But everytime returning the content, if i already set cookie to false.
I don't know how can i do that.
I tried with:
CURLOPT_RETURNTRANSFER,
CURLOPT_VERBOSE,
CURLOPT_HEADER
But nothing...
Thank's (sorry for my eng)