For Gearman PHP 1.1.1
sendData() only works for addTask.
It does not work with doNormal, doBackground or addTaskBackground submission types
(PECL gearman >= 0.6.0)
GearmanJob::sendData — Send data for a running job
$data
) : boolSends data to the job server (and any listening clients) for this job.
dataArbitrary serialized data.
成功时返回 true， 或者在失败时返回 false。
For Gearman PHP 1.1.1
sendData() only works for addTask.
It does not work with doNormal, doBackground or addTaskBackground submission types