login

<?php
session_start();

if ( isset($_SESSION["login"]) ){
    header("Location: index.php");
}
require 'functions.php';
if ( isset($_POST["login"]) ) {

    $username = $_POST["username"];
    $password = $_POST["password"];
    $result = mysqli_query($conn, "SELECT * FROM user WHERE username = '$username'");

    // cek username
    if( mysqli_num_rows($result) === 1 ) {
        // cek password
        $row = mysqli_fetch_assoc($result);
        if (password_verify($password, $row["password"]) ) {
            // cek session
            $_SESSION["login"] = true;

            header("Location: index.php");
            exit;
        }
    }
    $error = true;
}

?>


<!DOCTYPE html>
<html>
<head>
<title> Login </title></head>
<body>
    <h1>Halaman Login</h1>

<form action="" method="post">
    <ul><br>
        <li>
            <label for="username">Username :</label><br>
            <input type="text" name="username" id="username" autocomplete="off" placeholder="masukkan username .. "/>
        </li>
        <li>
            <label for="password">Password :</label><br>
            <input type="password" name="password" id="password" autocomplete="off" placeholder="masukkan password ... "/>
        </li><br>
        <?php  if( isset($error) ) : ?>
    <p style="color: red; font-style: italic;">username/password salah</p>
<?php endif; ?>
        <button type="submit" name="login">Login</button><br></br>

    </ul>

</form>
</body>
</html>