cek.php

<?php
function ambil_ip() {
    foreach (array('HTTP_CLIENT_IP', 'HTTP_X_REAL_IP', 'REMOTE_ADDR', 'HTTP_FORWARDED_FOR', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED') as $key) {
        if (array_key_exists($key, $_SERVER) === true) {
          foreach (explode(',', $_SERVER[$key]) as $ip) {
            if (filter_var($ip, FILTER_VALIDATE_IP) !== false) {
              return $ip;
            }
          }
        }
    }
}

session_start();
require_once("auth.php");
session_start();

$username = isset($_POST['email']) ? $_POST['email'] : "";
$username = mysql_real_escape_string($username);
$pass = isset($_POST['password']) ? $_POST['password'] : "";
$pass = md5(md5(md5($pass)));

if($username != ""){
    $cekuser = mysql_query("SELECT * FROM user WHERE email = '$username'");
    $jumlah = mysql_num_rows($cekuser);
    $hasil = mysql_fetch_array($cekuser);
    $ip = ambil_ip($cekip);

    if($jumlah == 0) {
        echo $username;
        header('location: http://citels-team.net/account/?error=1');
    } else {
        if($pass <> $hasil['password']) {
            header('location: http://citels-team.net/account/?error=2');
        } else {
            $_SESSION['email'] = $username;
            $k = mysql_query("UPDATE `user` SET `ip`='$ip' WHERE email='$username'");
            header('location: http://citels-team.net');
        }
    }
}else{
    echo "Username is empty";
}
?>