(PECL gearman >= 0.5.0)
GearmanClient::doLowBackground — Run a low priority task in the background
$function, string $workload, ?string $unique = null): stringRuns a low priority task in the background, returning a job handle which can be used to get the status of the running task. Normal and high priority tasks take precedence over low priority tasks in the job queue.
function由程序自动执行的已注册函数。
workload被处理的序列化数据。
unique用于标识特定任务的唯一性 ID。
The job handle for the submitted task.