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.

Note: The callback will only be triggered for tasks that are added (e.g. by calling GearmanClient::addTask()) after calling this method.

callback

A function or method to call. It should return a valid Gearman return value. If no return statement is present, it defaults to GEARMAN_SUCCESS.

callback(GearmanTask $task, mixed $context): int

task: The task this callback is called for.
context: Whatever has been passed to GearmanClient::addTask() (or equivalent method) as context.

Returns true on success or false on failure.

GearmanClient::setDataCallback