(PECL gearman >= 0.5.0)
GearmanClient::setExceptionCallback — Set a callback for worker exceptions
Specifies a callback function to call when a worker for a task sends an exception.
Nota: The callback will only be triggered for tasks that are added (e.g. by calling GearmanClient::addTask()) after calling this method.
callbackGEARMAN_SUCCESS.
taskcontextcontext.