(PECL gearman >= 0.5.0)
GearmanClient::setStatusCallback — Set a callback for collecting task status
Sets a callback function used for getting updated status information from a worker. The function should accept a single argument, a GearmanTask object.
callback
A function to call
�ɹ�ʱ���� TRUE
�� ������ʧ��ʱ���� FALSE
��