How to Redirect Users Back to Their Previous Page After Login?

Redirecting to the Previous Page After Login

When a user logs into a website, it's often desirable to redirect them back to the page they were previously browsing. This ensures a seamless user experience and eliminates the need for them to manually navigate back.

One way to implement this functionality is to pass the user's current location via a GET variable when redirecting them to the login page:

<code class="php">header("Location:login.php?location=" . urlencode($_SERVER['REQUEST_URI']));</code>

This will send the user to a login page that includes a hidden input field containing the URL of the previous page:

<code class="php">echo '<input type="hidden" name="location" value="';
if(isset($_GET['location'])) {
    echo htmlspecialchars($_GET['location']);
}
echo '" />';</code>

In the login-check.php script that processes the login request, if the login is successful and the location parameter is set, the user is redirected to the stored URL:

<code class="php">if(isset($_POST['location'])) {
    $redirect = $_POST['location'];
}

// ...

if(isset($_SESSION['id_login'])) {
    // if login is successful and there is a redirect address, send the user directly there
    if($redirect) {
        header("Location:". $redirect);
    }
}</code>

However, it's crucial to perform validation on the $_GET['location'] parameter to prevent users from being redirected to malicious websites. Additionally, always use urlencode when passing URLs as GET parameters to handle special URL characters correctly.

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