(PECL gearman >= 0.5.0)
GearmanClient::setCreatedCallback — Set a callback for when a task is queued
Sets a function to be called when a task is received and queued by the Gearman job server. The callback should accept a single argument, a GearmanClient oject.
A function to call
성공할 경우 TRUE를, 실패할 경우 FALSE를 반환합니다.