ReflectionFiber::getCallable (PHP 8 >= 8.1.0)ReflectionFiber::getCallable — Gets the callable used to create the Fiber 说明 public ReflectionFiber::getCallable(): callable Returns the callable used to construct the Fiber. If the fiber has terminated, an Error is thrown. 参数 此函数没有参数。 返回值 The callable used to create the Fiber.