(PECL gearman >= 0.6.0)
GearmanClient::setDataCallback — Callback function when there is a data packet for a task
public GearmanClient::setDataCallback ( callable $callback ) : bool
Sets the callback function for accepting data packets for a task. The callback function should take a single argument, a GearmanTask object.
callback
A function or method to call
Returns true
on success or false
on failure.
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https://www.php.net/manual/en/gearmanclient.setdatacallback.php