How can the header() function in PHP be utilized for redirecting users after a successful login?

To redirect users after a successful login in PHP, the header() function can be utilized to send a raw HTTP header to the browser, which will redirect the user to the desired page. After validating the user's credentials, you can use the header() function with the "Location" parameter set to the URL of the page you want to redirect the user to.

// Validate user credentials
if ($valid_credentials) {
    // Redirect user to dashboard page after successful login
    header("Location: dashboard.php");
    exit(); // Ensure that no other output is sent
} else {
    // Display error message
    echo "Invalid credentials. Please try again.";
}