(PECL gearman >= 0.5.0)
GearmanClient::setCompleteCallback — Set a function to be called on task completion
Use to set a function to be called when a task is completed. The callback function should accept a single argument, a GearmanTask oject.
callback
A function to be called
成功した場合に TRUE
を、失敗した場合に FALSE
を返します。