(PECL gearman >= 0.6.0)
GearmanJob::sendFail — Send fail status
public GearmanJob::sendFail ( ) : bool
Sends failure status for this job, indicating that the job failed in a known way (as opposed to failing due to a thrown exception).
This function has no parameters.
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/gearmanjob.sendfail.php