$login_url = "http://www.3dcontentcentral.com/default.aspx";
$post_data = '3dcclogin=zaurpost@yandex.ru&3dccpassword=123456';
$ch = curl_init();
curl_setopt($ch, CURLOPT_USERAGENT     , 'Mozilla/5.0 (Windows; U; Windows NT   5.1; en-GB; rv:1.9.1.4) Gecko/20091016 Firefox/3.5.4');
curl_setopt($ch, CURLOPT_URL, $login_url );
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_POST, 1 );
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_COOKIEJAR, $_SERVER['DOCUMENT_ROOT'].'/cookie.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, $_SERVER['DOCUMENT_ROOT'].'/cookie.txt');

$postResult = curl_exec($ch);
echo $postResult;