Untitled

<?php
include "connect.php";
?>

<?php
    if (isset($_POST['submit'])) {
        $username = $_POST['username'];
        $password = $_POST['password'];

        $query = "SELECT * FROM user WHERE username = '$username' OR email = '$username'";
        $result = mysqli_query($conn, $query);
        $user = mysqli_fetch_array($result);

        if (password_verify($password, $user['password'])) {
            session_start();
            $_SESSION['user_session'] = $user['id'];
            $_SESSION['user_identity'] = $user['username'];
            header('Location: index.php');
        } else {
            $error = "User/email atau password salah";
        }
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Log In</title>
    <link href="css/bootstrap.css" rel="stylesheet">
    <style>
        .vh-100 {
            height: 100vh;
        }
    </style>
</head>
<body>

    <div class="container vh-100">
        <div class="row align-items-center vh-100" >
            <form action="" method="POST" class="col-4 m-auto">
                <div class="card">
                    <div class="card-body">
                        <h4 class="card-title">Login</h4>
                        <div class="form-group">
                            <label>Username / Email</label>
                            <input type="text" name="username" class="form-control">
                        </div>
                        <div class="form-group">
                            <label>Password</label>
                            <input type="password" name="password" class="form-control">
                        </div>
                        <div class="form-group">
                            <input type="submit" value="Login" class="btn btn-primary" name="submit">
                            <a href="signup.php" class="btn btn-outline-dark" role="button">Register</a>
                        </div>
                    </div>
                </div>
            </form>


        </div>
    </div>
    <script src="js/jquery.js"></script>
    <script src="js/bootstrap.js"></script>
</body>
</html>