Online PHP editor | rfc for mgoqd

@ 2024-03-12T10:14:12Z

<?php

declare(strict_types=1);

namespace Repro;

class CycleValue {
    private ?\stdClass $cycleRef;

    public function __construct() {
        // make self cyclically referenced
        $this->cycleRef = new \stdClass();
        $this->cycleRef->x = $this;
    }

    public function __destruct() {
        echo "d\n";

        $this->cycleRef->x = null;
        $this->cycleRef = null;
    }
}

class CycleWithDestructorForGcMonitoring
{
    private \Closure $destructorFx;

    private \stdClass $cycleRef;

    public function __construct(\Closure $destructorFx)
    {
        $this->destructorFx = $destructorFx;
        $this->cycleRef = new \stdClass();
        $this->cycleRef->x = $this;
    }

    public function __destruct()
    {
        ($this->destructorFx)();
    }
}

$ref = \WeakReference::create(new CycleValue());

$isSecondGcRerun = false; // https://github.com/php/php-src/commit/b58d74547f
$createMonitorGcFx = static function () use ($ref): void {
    $destructorFx = static function () use ($ref): void {
        echo "gc\n";
        var_dump($ref->get() !== null);
        var_dump($ref->get() !== null);
    };

    new CycleWithDestructorForGcMonitoring($destructorFx);
};
$createMonitorGcFx();

gc_collect_cycles();
/**/if (PHP_VERSION_ID < 80100) { gc_collect_cycles(); }

echo "done\n";

Output for git.master, git.master_jit, rfc.property-hooks: d gc bool(true) bool(false) done

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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