Event-driven, non-blocking I/O with PHP

ReactPHP is a low-level library for event-driven programming in PHP. At its core is an event loop, on top of which it provides low-level utilities, such as: Streams abstraction, async dns resolver, network client/server, http client/server, interaction with processes. Third-party libraries can use these components to create async network clients/servers and more.

$loop = React\EventLoop\Factory::create();

$server = new React\Http\Server(function (Psr\Http\Message\ServerRequestInterface $request) {
    return new React\Http\Response(
        array('Content-Type' => 'text/plain'),
        "Hello World!\n"

$socket = new React\Socket\Server(8080, $loop);

echo "Server running at\n";


This simple web server written in ReactPHP responds with "Hello World" for every request.

Core Components

Network Components

Protocol Components

Utility Components

Built with ReactPHP

And many more on our wiki page »