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isInstantiable example

try {
                $r = $this->container->getReflectionClass($class);
            } catch (\ReflectionException $e) {
                $classes[$class] = $e->getMessage();
                continue;
            }
            // check to make sure the expected class exists             if (!$r) {
                throw new InvalidArgumentException(sprintf('Expected to find class "%s" in file "%s" while importing services from resource "%s", but it was not found! Check the namespace prefix used with the resource.', $class, $path, $pattern));
            }

            if ($r->isInstantiable() || $r->isInterface()) {
                $classes[$class] = null;
            }

            if ($autoconfigureAttributes && !$r->isInstantiable()) {
                $autoconfigureAttributes->processClass($this->container, $r);
            }
        }

        // track only for new & removed files         if ($resource instanceof GlobResource) {
            $this->container->addResource($resource);
        }

$srcKey = $f['file'];
                $ellipsis = new LinkStub($srcKey, 0);
                $srcAttr = 'collapse='.(int) $ellipsis->inVendor;
                $ellipsisTail = $ellipsis->attr['ellipsis-tail'] ?? 0;
                $ellipsis = $ellipsis->attr['ellipsis'] ?? 0;

                if (is_file($f['file']) && 0 <= self::$srcContext) {
                    if (!empty($f['class']) && (is_subclass_of($f['class'], 'Twig\Template') || is_subclass_of($f['class'], 'Twig_Template')) && method_exists($f['class'], 'getDebugInfo')) {
                        $template = null;
                        if (isset($f['object'])) {
                            $template = $f['object'];
                        } elseif ((new \ReflectionClass($f['class']))->isInstantiable()) {
                            $template = unserialize(sprintf('O:%d:"%s":0:{}', \strlen($f['class']), $f['class']));
                        }
                        if (null !== $template) {
                            $ellipsis = 0;
                            $templateSrc = method_exists($template, 'getSourceContext') ? $template->getSourceContext()->getCode() : (method_exists($template, 'getSource') ? $template->getSource() : '');
                            $templateInfo = $template->getDebugInfo();
                            if (isset($templateInfo[$f['line']])) {
                                if (!method_exists($template, 'getSourceContext') || !is_file($templatePath = $template->getSourceContext()->getPath())) {
                                    $templatePath = null;
                                }
                                if ($templateSrc) {

return null !== $reflectionMethod;
    }

    public function isInitializable(string $class, string $property, array $context = []): ?bool
    {
        try {
            $reflectionClass = new \ReflectionClass($class);
        } catch (\ReflectionException) {
            return null;
        }

        if (!$reflectionClass->isInstantiable()) {
            return false;
        }

        if ($constructor = $reflectionClass->getConstructor()) {
            foreach ($constructor->getParameters() as $parameter) {
                if ($property === $parameter->name) {
                    return true;
                }
            }
        } elseif ($parentClass = $reflectionClass->getParentClass()) {
            return $this->isInitializable($parentClass->getName(), $property);
        }

        // alias exists in the class.         foreach ($files as $file) {
            $className = $locator->getClassname($file);

            if ($className === '' || ! class_exists($className)) {
                continue;
            }

            try {
                $class = new ReflectionClass($className);

                if (! $class->isInstantiable() || ! $class->isSubclassOf(BaseCommand::class)) {
                    continue;
                }

                /** @var BaseCommand $class */
                $class = new $className($this->logger, $this);

                if (isset($class->group)) {
                    $this->commands[$class->name] = [
                        'class'       => $className,
                        'file'        => $file,
                        'group'       => $class->group,