PHP SYNTAX + CURL = smart redirect?

Code
<?php



//Upload a blank cookie.txt to the same directory as this file with a CHMOD/Permission to 777

function login($url,$data){

    $fp = fopen("cookie.txt", "w");

    fclose($fp);

    $login = curl_init();

    curl_setopt($login, CURLOPT_COOKIEJAR, "cookie.txt");

    curl_setopt($login, CURLOPT_COOKIEFILE, "cookie.txt");

    curl_setopt($login, CURLOPT_TIMEOUT, 40000);

    curl_setopt($login, CURLOPT_RETURNTRANSFER, TRUE);

    curl_setopt($login, CURLOPT_URL, $url);

    curl_setopt($login, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);

    curl_setopt($login, CURLOPT_FOLLOWLOCATION, TRUE);

    curl_setopt($login, CURLOPT_POST, TRUE);

    curl_setopt($login, CURLOPT_POSTFIELDS, $data);

    ob_start();

    return curl_exec ($login);

    ob_end_clean();

    curl_close ($login);

    unset($login);    

}                  



function grab_page($site){

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

    curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);

    curl_setopt($ch, CURLOPT_TIMEOUT, 40);

    curl_setopt($ch, CURLOPT_HTTPHEADER,array("Expect:"));

    curl_setopt($ch, CURLOPT_COOKIEFILE, "cookie.txt");

    curl_setopt($ch, CURLOPT_URL, $site);

    ob_start();

    return curl_exec ($ch);

    ob_end_clean();

    curl_close ($ch);

}



function post_data($site,$data,$data,$data){

    $datapost = curl_init();

        $headers = array("Expect:");

     curl_setopt($datapost, CURLOPT_URL, $site);

         curl_setopt($datapost, CURLOPT_TIMEOUT, 40000);

         curl_setopt($datapost, CURLOPT_HEADER, FALSE);

         curl_setopt($datapost, CURLOPT_HTTPHEADER, $headers);

     curl_setopt($datapost, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);

     curl_setopt($datapost, CURLOPT_POST, TRUE);

     curl_setopt($datapost, CURLOPT_POSTFIELDS, $data);

         curl_setopt($datapost, CURLOPT_COOKIEFILE, "cookie.txt");

    ob_start();

    return curl_exec ($datapost);

    ob_end_clean();

    curl_close ($datapost);

    unset($datapost);   



}



?>



<?php



    login("website","data");



    post_data("website",

"data1",



"data2");





?>