How To Post Topic Vbulletin via Curl ?

My code to login and grab page content , how to post Topic into Vbulletin ?

<?php

function curl_login($url,$data){
      $ch = curl_init();
      curl_setopt($ch, CURLOPT_URL, $url);
      curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)');
      curl_setopt($ch, CURLOPT_POST, 1);
      curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
      curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
      curl_setopt($ch, CURLOPT_COOKIEFILE, 'C:/xampp/htdocs/curl/cookie/cookie.txt');
      curl_setopt($ch, CURLOPT_COOKIEJAR, 'C:/xampp/htdocs/curl/cookie/cookie.txt');
      $result = curl_exec($ch);
      curl_close($ch);
      return $result;
    }
 
 
function curl_grab_page($site){
    global $url;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_COOKIEFILE, 'C:/xampp/htdocs/curl/cookie/cookie.txt');
    curl_setopt($ch, CURLOPT_COOKIEJAR, 'C:/xampp/htdocs/curl/cookie/cookie.txt'); 
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
    }
 

?>

PHP:

I need a functions curl to post topic into vbulletin 3.x or 4.x
Need help :-s