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@ 2022-06-30T14:48:40Z

<?php

var_dump(ini_get('memory_limit'));
echo "\n";

$shallowFiberFactoryFiber = new Fiber(function(): void {
    $fiberNumber = 0;
    while (true) {
        $res = new Fiber(function (\Closure $fx) use (&$fiberNumber): void {
            $res = $fx($fiberNumber++);
            
            Fiber::suspend($res);
        });
        
        Fiber::suspend($res);
    }
});

$shallowFiberFactoryFx = function () use ($shallowFiberFactoryFiber): \Fiber {
    return !$shallowFiberFactoryFiber->isStarted()
        ? $shallowFiberFactoryFiber->start()
        : $shallowFiberFactoryFiber->resume();
};

$i = 0;
$fx = function (int $fiberNumber) use ($shallowFiberFactoryFx): void {
    $res = array_map(function ($str) use ($shallowFiberFactoryFx, $fiberNumber) {
        global $i, $fx;
        $i++;
        
        // log/debug execution
        if (($i % 1_000) === 0) {
            var_dump($i . ' at fiber: ' . $fiberNumber);
        }
        
        // terminating cond
        if ($i > 50_000) {
            return 'finished at fiber: ' . $fiberNumber;
        }
        
        // recurse - every 2k reentry unroll the machine stack using Fiber
        return ($i % 2_000) === 0
            ? $shallowFiberFactoryFx()->start($fx)[0]
            : $fx($fiberNumber);
    }, ['x']);
    
    Fiber::suspend($res);
};

$res = $shallowFiberFactoryFx()->start($fx);

echo "\n";
print_r($res);

Output for git.master, rfc.property-hooks: string(3) "64M" string(16) "1000 at fiber: 0" string(16) "2000 at fiber: 0" string(16) "3000 at fiber: 1" string(16) "4000 at fiber: 1" string(16) "5000 at fiber: 2" string(16) "6000 at fiber: 2" string(16) "7000 at fiber: 3" string(16) "8000 at fiber: 3" string(16) "9000 at fiber: 4" string(17) "10000 at fiber: 4" Fatal error: Out of memory (allocated 18874368 bytes) (tried to allocate 16384 bytes) in /in/0Jjrr on line 27 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for git.master_jit: string(3) "64M" string(16) "1000 at fiber: 0" string(16) "2000 at fiber: 0" string(16) "3000 at fiber: 1" string(16) "4000 at fiber: 1" Fatal error: Out of memory (allocated 8388608 bytes) (tried to allocate 20480 bytes) in /in/0Jjrr on line 26 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.

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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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