Reactive PHP Events - Speaker Deck

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Reactive Events

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You can do awesome things in PHP

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$(".button").click(function() { $(".alert").show() .find(".label").html("You clicked a thing!"); });

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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!"; }); });

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Questions?

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This works because of the... event loop

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And now for something completely different

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This works because... Apache

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And then mod_php takes over...

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So, NodeJS then?

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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");

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NodeJS takes on the roles of web server and request processor!

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var filesystem = require("fs"); filesystem.readFile("/etc/passwd", function (error, data) { if (error) { throw err; } console.log(data); });

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ReactPHP

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Now we can do that NodeJS thing in PHP

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PHP also has closures

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Trouble is... NodeJS libraries are designed to be non-blocking

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PHP is still mostly blocking

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We can fix this in a few ways...

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We can evolve PHP to have lots of non-blocking code in core

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We can develop patterns and libraries for parallel execution

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Asynchronous vs. Parallel Fight!

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NodeJS is asynchronous but not parallel

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WAT then?!

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Queues

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Queues are one-way

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Queues are weak

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GIEF STREGNTH!

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https://github.com/asyncphp/remit

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Starts with events...

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then adds queues...

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Voilà!

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$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();

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$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();

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Distributed, non-blocking events for bi-directional communication with message queue workers

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Reactive PHP events