<?php
include __DIR__ . "/../../vendor/autoload.php";
$fileSubject = new \Rx\React\StreamSubject(fopen(__DIR__ . "/../test2.csv", 'r+w'));
$fileSubject->take(1)->mapTo("something even cooler")->doOnNext(function ($x) {
echo "writing '{$x}' to a file", PHP_EOL;
})->subscribe(new \Rx\Observer\CallbackObserver([$fileSubject, 'onNext']));
