Online PHP editor | output for USrWu

@ 2024-03-12T09:38:07Z

<?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());

$gcRuns = 0;
$isSecondGcRerun = false; // https://github.com/php/php-src/commit/b58d74547f
$createMonitorGcFx = static function () use (&$createMonitorGcFx, &$gcRuns, &$isSecondGcRerun, $ref): void {
    $destructorFx = static function () use (&$createMonitorGcFx, &$gcRuns, &$isSecondGcRerun, $ref): void {
        $gcRunsPrev = $gcRuns;
        $gcRuns = gc_status()['runs'];
        if ($gcRunsPrev !== $gcRuns) { // prevent recursion on shutdown
            echo "gc" . ($isSecondGcRerun ? ' rerun' : '') . "\n";
            var_dump($ref->get() !== null);
            $isSecondGcRerun = !$isSecondGcRerun;
            $createMonitorGcFx();
        }
    };

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

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

var_dump($ref->get() !== null);

echo "done\n";

Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.14, 8.4.16 - 8.4.18, 8.5.0 - 8.5.3: d gc bool(true) gc rerun bool(false) bool(false) done
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33: Parse error: syntax error, unexpected '?', expecting function (T_FUNCTION) or const (T_CONST) in /in/USrWu on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.33: Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/USrWu on line 8
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40: Warning: Unsupported declare 'strict_types' in /in/USrWu on line 3 Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/USrWu on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29: Warning: Unsupported declare 'strict_types' in /in/USrWu on line 3 Parse error: syntax error, unexpected '?', expecting T_VARIABLE in /in/USrWu on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_STRING in /in/USrWu on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_STRING in /in/USrWu on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/USrWu on line 5
Process exited with code 255.

preferences:dark modelive previewkey bindings