you need to do POSTin http://aftabcurrency.com/login_script.php
your curl should also accept cookies. After authentication, the script will redirect you, so you also need to add CURLOPT_FOLLOWACTION .
here is the edited version of your script, I can not check it at http://aftabcurrency.com/ I hope it works:
$url = "http://aftabcurrency.com/login_script.php";
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
$cookie = 'cookies.txt';
$timeout = 30;
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout );
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch,CURLOPT_POSTFIELDS,"user_name=user&user_password=pass&passcode=code");
$result = curl_exec($ch);
/* //OPTIONAL - Redirect to another page after login
$url = "http://aftabcurrency.com/some_other_page";
curl_setopt ($ch, CURLOPT_POST, 0);
curl_setopt($ch, CURLOPT_URL, $url);
$result = curl_exec($ch);
*/ //end OPTIONAL
curl_close($ch);
echo $result;
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