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Slim Framework Flash Messages

This repository contains a Slim Framework Flash messages service provider. This enables you to define transient messages that persist only from the current request to the next request.

Install

Via Composer

$ composer require slim/flash

Requires Slim 3.0.0 or newer.

Usage

Slim 4

This example assumes that you have php-di/php-di installed.

<?php

use DI\ContainerBuilder;
use Slim\Factory\AppFactory;
use Slim\Flash\Messages;
use Slim\Routing\RouteContext;

require_once __DIR__ . '/../vendor/autoload.php';

$containerBuilder = new ContainerBuilder();

// Add container definition for the flash component
$containerBuilder->addDefinitions(
    [
        'flash' => function () {
            $storage = [];
            return new Messages($storage);
        }
    ]
);

AppFactory::setContainer($containerBuilder->build());

$app = AppFactory::create();

// Add session start middleware
$app->add(
    function ($request, $next) {
        // Start PHP session
        if (session_status() !== PHP_SESSION_ACTIVE) {
            session_start();
        }

        // Change flash message storage
        $this->get('flash')->__construct($_SESSION);

        return $next->handle($request);
    }
);

$app->addErrorMiddleware(true, true, true);

// Add routes
$app->get(
    '/',
    function ($request, $response) {
        // Set flash message for next request
        $this->get('flash')->addMessage('Test', 'This is a message');

        // Redirect
        $url = RouteContext::fromRequest($request)->getRouteParser()->urlFor('bar');

        return $response->withStatus(302)->withHeader('Location', $url);
    }
);

$app->get(
    '/bar',
    function ($request, $response) {
        $flash = $this->get('flash');

        // Get flash messages from previous request
        $messages = $flash->getMessages();
        print_r($messages);

        // Get the first message from a specific key
        $test = $flash->getFirstMessage('Test');
        print_r($test);

        return $response;
    }
)->setName('bar');

$app->run();

Slim 3

// Start PHP session
session_start();

$app = new \Slim\App();

// Fetch DI Container
$container = $app->getContainer();

// Register provider
$container['flash'] = function () {
    return new \Slim\Flash\Messages();
};

$app->get('/foo', function ($req, $res, $args) {
    // Set flash message for next request
    $this->flash->addMessage('Test', 'This is a message');

    // Redirect
    return $res->withStatus(302)->withHeader('Location', '/bar');
});

$app->get('/bar', function ($req, $res, $args) {
    // Get flash messages from previous request
    $messages = $this->flash->getMessages();
    print_r($messages);

    // Get the first message from a specific key
    $test = $this->flash->getFirstMessage('Test');
    print_r($test);
});

$app->run();

Please note that a message could be a string, object or array. Please check what your storage can handle.

Using with Twig-View

If you use Twig-View, then slim-twig-flash may be a useful integration package.

Testing

$ phpunit

Contributing

Please see CONTRIBUTING for details.

Security

If you discover any security related issues, please email security@slimframework.com instead of using the issue tracker.

Credits

License

The MIT License (MIT). Please see License File for more information.