<?php
$username = $_POST["username"];
$password = $_POST["password"];
$url = 'https://secure.runescape.com/m=weblogin/login.ws';
$fields = array(
                        'rem' => 'on',
                        'submit' => 'Log In',
                        'mod' => 'www',
                        'ssl' => '1',
                        'expired' => '0',
                        'dest' => 'account_settings.ws?jptg=ia&jptv=navbar',
                        'username' => $username,
                        'password' => $password
                );
foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
rtrim($fields_string,'&');
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_POST,count($fields));
curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
$result = curl_exec($ch);

// Do what you want with $result here

curl_close($ch);
?>