sintak login

<?php
require 'inc/function.php';

if (isset($_POST["login"])  ) {

   $user = $_POST['user'];
    $pass = $_POST['pass'];

   $result = mysqli_query($con, "SELECT * FROM tb_user WHERE username = '$user'" );

    //cek username
    if (mysqli_num_rows($result) === 1 ) {

        //cek password
        $row = mysqli_fetch_assoc($result);
        if (password_verify($pass, $row["password"])){
        header("location: index.php?info");

        exit;
        }

    }

    $error = true;
}


?>


<link rel="stylesheet" type="text/css" href="css/in.css">
<body>
    <?php if ( isset($error)): ?>
            <script type="text/javascript">alert("password dan username salah");</script>
         <?php endif ?>
    <div id="canvas">
        <div class="judul">
           FORM LOGIN
        </div>
    </div>
        <form action="" method="post" class="in">
                    <p style="margin-top: 40px;">
                    <input type="text" name="user" placeholder="Username" class="input" />
                    </p>
                    <p style="margin-top: 20px;">
                    <input type="password" name="pass" placeholder="Password" class="input" />
                    </p>
                    <a href="" class="l">Lupa Password</a>
                <input type="submit" value="SING IN" class="tombol" name="login"  />
                <p class="akun">Belum Punya Akun
                    <a href="index.php?regis" class="up">SING UP</a>
                </p>

        </form>

</body>