PHP Manual: GearmanClient::setCreatedCallback

public function GearmanClient::setCreatedCallback(callable $callback): bool

Sets a callback function to be called when a task is received and queued by the Gearman job server.

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.

function 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::setCreatedCallback