I Promise() to Teach you Asynchronous PHP Eric Mann - Tozny - php[tek] 2016

Terminology Imperative / Procedural Concurrent Parallel Concurrent Parallel

Project Setup

Copy the USB drive to your machine Install Vagrant/VirtualBox if you don’t have them Add the eisago Vagrant box: 
 vagrant box add ericmann/eisago eisago.box Start the Vagrant box and SSH into it Set up your IDE for the project

Part I: Imperative We’re building an importer - turn a collection of text files into an indexed MongoDB database Let’s work through the 5 TODOs in the application Now, let’s run it!

10 minute break

Icicle/ReactPHP Write asynchronous (concurrent) code in PHP Support event loops natively (and stop blocking I/O) Use Promises in PHP to juggle multiple tasks at once Requires an event (and signaling) extension for PHP to work properly

Icicle/ReactPHP then( $resolve ); } ); $promise ->then( function( $data ) { echo $data; } )->done ( function() { echo 'Done!'; } ); Loop\run();

Icicle/ReactPHP then( $resolve ); } ); $promise2 = new Promise( function( $resolve, $reject ) { do_something_else_async()->then( $resolve ); } ); Icicle\Awaitable\all( [ $promise1, $promise2 ] ) ->done( function() { echo 'Done!'; }, function() { echo 'Error!'; } ); Loop\run();

Part II: Concurrent Let’s refactor for concurrency Again, there are 5 TODOs in the application Now, let’s run it!

10 minute break

pthreads User-land multi-threading in PHP by way of an extension Provides threads, workers, and threaded objects All of your code – the server and the worker – are the same application Each component has its own scope

pthreads workerId = $id; } public function run() { // Do some heavy processing } }

pthreads start(); // Now they'll each run independently } foreach ( range( 0, 5 ) as $id ) {
 // Force the threads to rejoin the main process synchronously $workers[ $id ]->join(); }

Part III: Concurrent Parallel Let’s refactor for parallelism (threading) Yet again, there are 5 TODOs in the application
 They’re in 2 different files, though … Now, let’s run it!

Questions?

I Promise() to Teach you Asynchronous PHP Eric Mann - Tozny - php[tek] 2016