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@ 2020-11-02T17:19:07Z

<?php

function coroutine1() {
	for ($i = 1; $i <= 5; $i++) {
		echo "coroutine1: {$i}\n";
		yield;
	}
}

function coroutine2() {
	for ($i = 1; $i <= 10; $i++) {
		echo "coroutine2: {$i}\n";

		$loop = yield;
		if ($i == 3) {
			echo "coroutine2 spawning coroutine3\n";
			$loop->enqueue("#3", coroutine3());
		}
	}
}

function coroutine3() {
	for ($i = 1; $i <= 5; $i++) {
		echo "coroutine3: {$i}\n";
		yield;
	}
}

class EventLoop {
	private $tasks = [];

	public function enqueue($key, Generator $task) {
		$this->tasks[$key] = $task;
	}

	public function run() {
		foreach ($this->tasks as $key => $task) {
			$task->send($this);
			if (!$task->valid()) {
				echo "task {$key} complete\n";
				unset($this->tasks[$key]);
			}
		}

		return !empty($this->tasks);
	}
}

$loop = new EventLoop();
$loop->enqueue("#1", coroutine1());
$loop->enqueue("#2", coroutine2());

while ($loop->run());

Output for git.master, git.master_jit, rfc.property-hooks: coroutine1: 1 coroutine1: 2 coroutine2: 1 coroutine2: 2 coroutine1: 3 coroutine2: 3 coroutine1: 4 coroutine2 spawning coroutine3 coroutine2: 4 coroutine1: 5 coroutine2: 5 coroutine3: 1 coroutine3: 2 task #1 complete coroutine2: 6 coroutine3: 3 coroutine2: 7 coroutine3: 4 coroutine2: 8 coroutine3: 5 coroutine2: 9 task #3 complete coroutine2: 10 task #2 complete

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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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