Matthias\SymfonyServiceDefinitionValidator\ConstructorResolver::resolveClassWithConstructor PHP Method

    private function resolveClassWithConstructor($class)
    {
        $class = $this->resolvePlaceholders($class);
        $reflectionClass = new \ReflectionClass($class);
        if ($reflectionClass->hasMethod('__construct')) {
            $constructMethod = $reflectionClass->getMethod('__construct');
            if (!$constructMethod->isPublic()) {
                throw new NonPublicConstructorException($class);
            }
            return $constructMethod;
        }
        return null;
    }