.-.-.-.-.-

<?php
// Initialize the session
if (!isset($_SESSION)) {
    session_start();
}

// Check if the user is already logged in, if yes then redirect him to welcome page
if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
    header("location: index.php");
    exit;
}

// Include config file
require_once "./../settings.config.php";
require_once "./../DBConnection.php";

$database = new DbConnection($config);
// Define variables and initialize with empty values
$username = $password = "";
$username_err = $password_err = "";

// Processing form data when form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {

// Check if username is empty
    if (empty(trim($_POST["username"]))) {
        $username_err = "Please enter username.";
    } else {
        $username = trim($_POST["username"]);
    }

// Check if password is empty
    if (empty(trim($_POST["password"]))) {
        $password_err = "Please enter your password.";
    } else {
        $password = trim($_POST["password"]);
    }

// Validate credentials
    if (empty($username_err) && empty($password_err)) {
        // Prepare a select statement
        $sql = "SELECT id, username, password FROM users WHERE username = :username";

if ($stmt = $database->dbc->prepare($sql)) {
            // Bind variables to the prepared statement as parameters
            $stmt->bindParam(":username", $param_username, PDO::PARAM_STR);

// Set parameters
            $param_username = trim($_POST["username"]);

// Attempt to execute the prepared statement
            if ($stmt->execute()) {
                // Check if username exists, if yes then verify password
                if ($stmt->rowCount() == 1) {
                    if ($row = $stmt->fetch()) {
                        $id = $row["id"];
                        $username = $row["username"];
                        $hashed_password = $row["password"];
                        if (password_verify($password, $hashed_password)) {
                            // Password is correct, so start a new session
                            session_start();

// Store data in session variables
                            $_SESSION["loggedin"] = true;
                            $_SESSION["id"] = $id;
                            $_SESSION["username"] = $username;
                            //var_dump($_SESSION);

// Redirect user to welcome page
                            header("location: index.php");
                            //session_write_close();
                            //session_write_close(); and session_regenerate_id(true), you can try those as well, but I'd use exit();
                            session_regenerate_id(true);
                            //exit();
                        } else {
                            // Display an error message if password is not valid
                            $password_err = "The password you entered was not valid.";
                        }
                    }
                } else {
                    // Display an error message if username doesn't exist
                    $username_err = "No account found with that username.";
                }
            } else {
                echo "Oops! Something went wrong. Please try again later.";
            }

// Close statement
            unset($stmt);
        }
    }

// Close connection
    unset($pdo);
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
    <style type="text/css">
        body{ font: 14px sans-serif; }
        .wrapper{ width: 350px; padding: 20px; }
    </style>
</head>
<body>
    <div class="wrapper">
        <h2>Login</h2>
        <p>Please fill in your credentials to login.</p>
        <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
            <div class="form-group <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
                <label>Username</label>
                <input type="text" name="username" class="form-control" value="<?php echo $username; ?>">
                <span class="help-block"><?php echo $username_err; ?></span>
            </div>
            <div class="form-group <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
                <label>Password</label>
                <input type="password" name="password" class="form-control">
                <span class="help-block"><?php echo $password_err; ?></span>
            </div>
            <div class="form-group">
                <input type="submit" class="btn btn-primary" value="Login">
            </div>
            
        </form>
    </div>
</body>
</html>

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