function weaken

@internal

See also

https://github.com/amphp/amp/blob/f682341c856b1f688026f787bef4f77eaa5c7…

2 calls to weaken()

AsynchronousInstruments::observe in vendor/open-telemetry/sdk/Metrics/AsynchronousInstruments.php

ShutdownHandler::register in vendor/open-telemetry/sdk/Common/Util/ShutdownHandler.php

Registers a function that will be executed on shutdown.

File

vendor/open-telemetry/sdk/Common/Util/functions.php, line 25

Namespace

OpenTelemetry\SDK\Common\Util

Code

function weaken(Closure $closure, ?object &$target = null) : Closure {
    $reflection = new ReflectionFunction($closure);
    if (!($target = $reflection->getClosureThis())) {
        return $closure;
    }
    $scope = $reflection->getClosureScopeClass();
    $name = $reflection->getShortName();
    if (!str_starts_with($name, '{closure')) {
        
        /** @psalm-suppress InvalidScope @phpstan-ignore-next-line @phan-suppress-next-line PhanUndeclaredThis */
        $closure = fn(...$args) => $this->{$name}(...$args);
        if ($scope !== null) {
            $closure = $closure->bindTo(null, $scope->name);
        }
    }
    static $placeholder;
    $placeholder ??= new stdClass();
    
    /** @psalm-suppress PossiblyNullReference */
    $closure = $closure->bindTo($placeholder);
    $ref = WeakReference::create($target);
    
    /**
     * @psalm-suppress all
     */
    return $scope && $target::class === $scope->name && !$scope->isInternal() ? static fn(...$args) => ($obj = $ref->get()) ? $closure->call($obj, ...$args) : null : static fn(...$args) => ($obj = $ref->get()) ? $closure->bindTo($obj)(...$args) : null;
}