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@ 2016-05-20T12:57:24Z

<?php

class Awaitable {
    private $callbacks = [];
    
    function when(callable $cb) {
        $this->callbacks[] = $cb;
    }
    
    function resolve($error, $value) {
        if ($value instanceof Awaitable) {
            $value->when(function($e, $v) {
                $this->resolve($e, $v);
            });
        } else {
            $this->doResolve($error, $value);
        }
    }
    
    private function doResolve($error, $value) {
        foreach ($this->callbacks as $cb) {
            $cb($error, $value);
        }
    }
}

$awaitables = [];
$first = null;
$last = null;

for ($i = 0; $i < 100000000; $i++) {
    $awaitable = new Awaitable;
    
    if (!$first) {
        $first = $awaitable;
        $last = $awaitable;
    } else {
        $last->resolve(null, $awaitable);
    }
}

$last->resolve(null, 42);

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Output for rfc.property-hooks, git.master, git.master_jit: Process exited with code 137.

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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