Framework X – the simple and fast micro framework for building reactive web applications that run anywhere.

v0.16.0 2024-03-05 14:41 UTC

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Last update: 2024-07-15 10:03:39 UTC


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Framework X – the simple and fast micro framework for building reactive web applications that run anywhere.

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Start by creating an empty project directory. Next, we can start by taking a look at a simple example application. You can use this example to get started by creating a new public/ directory with an index.php file inside:


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

$app = new FrameworkX\App();

$app->get('/', function () {
    return React\Http\Message\Response::plaintext(
        "Hello wörld!\n"

$app->get('/users/{name}', function (Psr\Http\Message\ServerRequestInterface $request) {
    return React\Http\Message\Response::plaintext(
        "Hello " . $request->getAttribute('name') . "!\n"


Next, we need to install X and its dependencies to actually run this project. In your project directory, simply run the following command:

$ composer require clue/framework-x:^0.16

See also the CHANGELOG for details about version upgrades.

That's it already! The next step is now to serve this web application. One of the nice properties of this project is that is works both behind traditional web server setups as well as in a stand-alone environment.

For example, you can run the above example using the built-in web server like this:

$ php public/index.php

You can now use your favorite web browser or command line tool to check your web application responds as expected:

$ curl http://localhost:8080/
Hello wörld!


Hooked? See website for full documentation.

Found a typo or want to contribute? The website documentation is built from the source documentation files in the docs/ folder.


You want to contribute to the Framework X source code or documentation? You've come to the right place!

To contribute to the source code just locate the src/ folder and you'll find all content in there. Additionally, our tests/ folder contains all our unit tests and acceptance tests to assure our code works as expected. For more information on how to run the test suite check out our testing chapter.

If you want to contribute to the documentation of Framework X found on the website, take a look inside the docs/ folder. You'll find further instructions inside the in there.

Found a typo on our website? Simply go to our website repository and follow the instructions found in the README.


To run the test suite, you first need to clone this repo and then install all dependencies through Composer:

$ composer install

To run the test suite, go to the project root and run:

$ vendor/bin/phpunit

The test suite is set up to always ensure 100% code coverage across all supported environments. If you have the Xdebug extension installed, you can also generate a code coverage report locally like this:

$ XDEBUG_MODE=coverage vendor/bin/phpunit --coverage-text

Additionally, you can run our sophisticated integration tests to verify the framework examples work as expected behind your web server. Use your web server of choice (see deployment documentation) and execute the tests with the URL to your installation like this:

$ php tests/integration/public/index.php
$ tests/integration.bash http://localhost:8080/


This project is released under the permissive MIT license.

Did you know that I offer custom development services and issuing invoices for sponsorships of releases and for contributions? Contact me (@clue) for details.