Reactive PHP Events

Event loops in PHP.

1. Reactive Events
2. You can do awesome things in PHP
3. $(".button").click(function() { $(".alert").show() .find(".label").html("You clicked a thing!"); });
4. var buttons = document.querySelectorAll(".button"); buttons.forEach(function(button) { button.addEventListener("click", function(event) { button.style.visibility = "visible"; var label = document.querySelector(".button .label"); label.innerHTML = "You clicked a thing!"; }); });
5. Questions?
6. This works because of the... event loop
7. And now for something completely different
8. This works because... Apache
9. And then mod_php takes over...
10. So, NodeJS then?
11. var http = require("http"); http.createServer(function (request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.end("Hello World"); }) http.listen(1337, "127.0.0.1");
12. NodeJS takes on the roles of web server and request processor!
13. var filesystem = require("fs"); filesystem.readFile("/etc/passwd", function (error, data) { if (error) { throw err; } console.log(data); });
14. ReactPHP
15. Now we can do that NodeJS thing in PHP
16. PHP also has closures
17. Trouble is... NodeJS libraries are designed to be non-blocking
18. PHP is still mostly blocking
19. We can fix this in a few ways...
20. We can evolve PHP to have lots of non-blocking code in core
21. We can develop patterns and libraries for parallel execution
22. Asynchronous vs. Parallel Fight!
26. NodeJS is asynchronous but not parallel
27. WAT then?!
28. Queues
29. Queues are one-way
30. Queues are weak
31. GIEF STREGNTH!
32. https://github.com/asyncphp/remit
33. Starts with events...
34. then adds queues...
35. Voilà!
36. $server = new AsyncPHP\Remit\Adapter\ZeroMQ\Server( // some boring guff ); $server->addListener("tick", function ($event, $i) { print "TICK {$i}\n"; }); $server->addListener("done", function ($event) { print "DONE\n"; }); $loop->run();
37. $client = new AsyncPHP\Remit\Adapter\ZeroMQ\Client( // some more boring guff ); foreach (range(1, 5) as $i) { $loop->addTimer($i, function () use ($client, $i) { $client->emit("tick", $i); }); } $loop->addTimer(6, function () use ($client) { $client->emit("done"); }); $loop->run();
38. Distributed, non-blocking events for bi-directional communication with message queue workers
39. Reactive PHP events