php curl function don't save cookie (cookie file : empty) - php

Question

i have problem that the "PHP" cURL function don't save the cookie !
curl function :
$file['cookie'] = "cooki";
function cURL_Page($url='',$var=''){
global $file;
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT,20);
curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31');
curl_setopt($curl, CURLOPT_REFERER, "http://www.libertyreserve.com/en/login");
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
if($var) {
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $var);
}
curl_setopt($curl, CURLOPT_COOKIE,$file['cookie']);
curl_setopt($curl, CURLOPT_COOKIEFILE,$file['cookie']);
curl_setopt($curl, CURLOPT_COOKIEJAR,$file['cookie']);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 3);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
$result = curl_exec($curl);
curl_close($curl);
return $result;
}
in the file "cooki" the are no results
p.s : i curl a https page
thanks all