(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.
A function to be called
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.