(PECL gearman >= 0.5.0)
GearmanClient::setStatusCallback — Set a callback for collecting task status
public GearmanClient::setStatusCallback ( callable $callback ) : bool
Sets a callback function used for getting updated status information from a worker. The function should accept a single argument, a GearmanTask object.
callback
A function to call
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/gearmanclient.setstatuscallback.php