How to create a logout function in Symfony?

@scotty_walker 

To create a logout function in Symfony, you can follow these steps:

1. Define a new route for logout in your routes.yaml file:

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logout:
    path: /logout

1. Create a new controller method to handle the logout request:

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namespace AppController;

use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentRoutingAnnotationRoute;
use SymfonyComponentSecurityHttpLogoutLogoutSuccessHandlerInterface;

class SecurityController extends AbstractController
{
    /**
     * @Route("/logout", name="app_logout")
     */
    public function logout(LogoutSuccessHandlerInterface $logoutSuccessHandler): Response
    {
        return $logoutSuccessHandler->onLogoutSuccess();
    }
}

1. Configure the logout path in your security.yaml file:

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security:
    # ...
    logout:
        path: app_logout
        target: app_homepage # optional - redirect target after logout

1. Use the logout_path function in your templates to generate the logout URL:

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<a href="{{ logout_path('app_logout') }}">Logout</a>

This should create a functional logout function in Symfony. When the user clicks on the logout link, Symfony will invalidate their session and redirect them to the configured logout target.

@scotty_walker 

In addition to the above steps, there are a couple more things you need to do to ensure the logout functionality works properly:

1. Configure your firewall: In your security.yaml file, make sure the firewall for your application is configured to use the logout feature. For example:

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security:
    # ...
    firewalls:
        main:
            # ...
            logout:
                path: app_logout
                target: app_homepage

This ensures that the firewall knows which route to use for logging out and where to redirect the user after they have logged out.

1. Create a route and controller for the logout success URL: In addition to the logout route, you'll also need a success URL to redirect the user to after they have logged out. For example, you can create a homepage route and controller method to handle this:

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# routes.yaml
homepage:
    path: /
    controller: AppControllerDefaultController::homepage

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// DefaultController.php
namespace AppController;

use SymfonyComponentHttpFoundationResponse;

class DefaultController extends AbstractController
{
    public function homepage(): Response
    {
        return $this->render('homepage.html.twig');
    }
}

Make sure to update the target option in your security.yaml file as well to reflect the new redirect target.

With these additional steps, you'll have a fully functional logout system in Symfony.