如果用户名/电子邮件错误，PHP什么也不做

Question

我正在制作登录系统。一切正常，但是当我在登录中使用不在数据库中的电子邮件（用户名）时，它将转到带有文件名的URL，然后只是表单数据（电子邮件和密码）。我需要设置标题错误，所以我可以说登录失败了。有谁看到这个问题？

<?php

ob_start();

if (isset($_REQUEST['password'])) {
    require 'connect.php';
    $password = $_REQUEST['password'];
    $mail = $_REQUEST['email'];

    if (empty($mail) || empty($password)) {
        header('location: ../login.php?error=empty');
        exit();
    } else {
        $sql = "SELECT * FROM account WHERE email = ?;";
        $stmt = mysqli_stmt_init($connect);
        if (!mysqli_stmt_prepare($stmt, $sql)) {
            header("Location: ../login.php?error=sqlError");
            exit();
        } else {
            mysqli_stmt_bind_param($stmt, "s", $mail);
            mysqli_stmt_execute($stmt);
            $result = mysqli_stmt_get_result($stmt);
            if ($row = mysqli_fetch_assoc($result)) {
                $passwordCheck = password_verify($password, $row['wachtwoord']);
                if ($passwordCheck == false) {
                    header("Location: ../login.php?error=passwordWrong");
                    exit();
                } elseif ($passwordCheck == true) {
                    session_start();
                    $_SESSION['userId'] = $row['account_id'];
                    $_SESSION['username'] = $row['gebruikersnaam'];
                    header("Location: ../index.php?login=succes");
                    exit();
                }
            } else {
                header("Location login.php?error=noUser");
                exit();
            }
        }
    }
} else {
    header("Location: ../login.php?error=");
    exit();
}