How to use PHP cURL login without COOKIEFILE??

<?php
/* php curl function to enable cookie without cookiejar (I got it from github) */function fetch($url, $cookies = null, $returnCookie = false) {    $ch = curl_init();    curl_setopt($ch, CURLOPT_URL, $url);    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);    if($cookies){        curl_setopt($ch, CURLOPT_COOKIE, implode(';',$cookies));    }    curl_setopt($ch, CURLOPT_HEADER, 1);    $result = curl_exec($ch);    list($header, $body) = explode("\r\n\r\n", $result, 2);    $end = strpos($header, 'Content-Type');    $start = strpos($header, 'Set-Cookie');    $parts = explode('Set-Cookie:', substr($header, $start, $end - $start));    $cookies = array();    foreach ($parts as $co) {        $cd = explode(';', $co);        if (!empty($cd[0]))            $cookies[] = $cd[0];    }    curl_close($ch);    if ($returnCookie){        return $cookies;    }    return json_decode($body);}
/** * * my code starts here * */
/* request new session on twitter login page */$request1 = curl_init();curl_setopt_array($request1, Array(    CURLOPT_URL => 'hxx ps: / /mobile . twitter . c*m /session /new',    CURLOPT_FOLLOWLOCATION => false,    CURLOPT_SSL_VERIFYPEER => false,    CURLOPT_RETURNTRANSFER => true,    CURLOPT_COOKIEJAR => 'cookies.txt',    CURLOPT_TIMEOUT => 13,    CURLOPT_USERAGENT => "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36",    CURLOPT_HEADER => true));$response1 = curl_exec($request1);curl_close($request1);
/* get twitter authenticity_token */preg_match("/authenticity_token\" type=\"hidden\" value=\"([^\"]+)/i", $response1, $token);$mytoken = $token[1];
/* data to be posted */$user = 'USERNAME';$pass = 'PASSWORD';$postdata = "authenticity_token=" . rawurlencode($mytoken) . "&username=" . $user . "&password=" . $pass;
/* next request which needs cookiefile */$request2  = curl_init();curl_setopt_array($request2, Array(    CURLOPT_URL => 'hxx ps: / /mobile . twitter . c*m /session',    CURLOPT_SSL_VERIFYPEER => false,    CURLOPT_RETURNTRANSFER => true,    CURLOPT_FOLLOWLOCATION => false,    CURLOPT_COOKIEJAR => 'cookies.txt',    CURLOPT_COOKIEFILE => 'cookies.txt',    CURLOPT_TIMEOUT => 13,    CURLOPT_USERAGENT => "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36",    CURLOPT_HEADER => true,    CURLOPT_REFERER => 'hxx ps: / /mobile . twitter . c*m /session /new',    CURLOPT_CUSTOMREQUEST => "POST",    CURLOPT_POST => true,    CURLOPT_POSTFIELDS => $postdata));$response2 = curl_exec($request2);curl_close($request2);
/* save response to txt file, for learning purpose */$check = fopen('response.txt', 'w+');fwrite($check, $response2);fclose($check);