(PECL gearman >= 0.5.0)
GearmanClient::clearCallbacks — Clear all task callback functions
public GearmanClient::clearCallbacks ( ) : bool
Clears all the task callback functions that have previously been set.
This function has no parameters.
 Always returns true. 
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    https://www.php.net/manual/en/gearmanclient.clearcallbacks.php