PHP - 从包含的文件刷新整个页面？

At the top of every page I have a header (header.inc.php) that has a login field that I add with

include 'login.php';

The code there is:

<?php 
    include 'checkPassword.php';
    if (isset($_POST['login'])) {
        if (checkLogin($_POST['username'], $_POST['password'])) {
            session_start();
            $_SESSION['isLoggedIn'] = true;
            header("Refresh:0");
            exit();
        } else {
            echo '<h1>nope</h1>';
        }
    }

?>

<div id="login"> <!-- Login field with link to registration -->
    <fieldset>
    <form method="POST" action="login.php">
    <Legend>Login</Legend>
    Username <input type="text" name="username" <?php if (isset($username)) {echo "value=$username";} ?>>
    Password <input type="password" name="password"/>
    <input type="submit" name="login">
    <div id="register">
        <a href="registration.html">Not a member? Click here to register!</a>
    </div>
    </form>     
    </fieldset>
</div>

I've seen a few different methods for using header() to load a certain page, but the login appears at the top of every page, therefore I'd like a way for the PHP to refer to itself. However, all the methods I've found so far refer to 'login.php', instead of the page the overall page that contains the header and login.

try this one

<?php 
include 'checkPassword.php';
if (isset($_POST['login'])) {
    if (checkLogin($_POST['username'], $_POST['password'])) {
        session_start();
        $_SESSION['isLoggedIn'] = true;
        header("Refresh:0");
        exit();
    } else {
        echo '<h1>nope</h1>';
    }
}

?>

It refreshes your current page, and if you need to redirect it to another page, use following:

header("Refresh:0; url=page2.php");

echo meta tag like this: URL is the one where the page should be redirected to after refresh.

echo "<meta http-equiv=\"refresh\" content=\"0;URL=upload.php\">";