[PHP]login.php

<?php

// define the mysql settings
define("DB_SERVER", "localhost");
define("DB_USERNAME","username");
define("DB_PASSWORD", "password");
define("DB_NAME", "database");

// setting MySQL table and configuration
$connection = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME) or die ("Cannot connect");

// read input from user
$username = $_POST["username"];
$password = $_POST["password"];

if(isset($_POST["login"])) {
    if (empty($_POST["username"]) || empty($_POST["password"])) {
        echo "Fill the username and the password text field";
    } else {
        // protect from SQL Injection
        $username = stripslashes($username);
        $password = stripslashes($password);
        $username = mysqli_real_escape_string($connection, $username);
        $password = mysqli_real_escape_string($connection, $password);
        $password = md5($password);

        // execute the query
        $query = "select * from account where username = '$username' and password = '$password'";
        $result = mysqli_query($connection, $query) or die (mysql_error());
        $row = mysqli_fetch_array($result, MYSQLI_ASSOC);
        if (mysqli_num_rows($result) == 1) {
            if ($row["username"] == $username && $row["password"] == $password) {
                echo "LOGIN SUKSES";
            }
        } else {
            echo "LOGIN GAGAL";
        }
    }
}

?>