Callback function when there is a data packet for a task (deprecated)

# GearmanClient::setClientCallback

(PECL gearman <= 0.5.0)

GearmanClient::setClientCallback — Callback function when there is a data packet for a task (deprecated)

### 说明

public function GearmanClient::setClientCallback(callable `$callback`): void

Sets the callback function for accepting data packets for a task.

> 注意: This method has been replaced by GearmanClient::setDataCallback() in the 0.6.0 release of the Gearman extension.

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

### 参数

`callback`
  调用的函数或方法。应该返回有效的 Gearman 返回值。 如果没有返回语句，默认是 `GEARMAN_SUCCESS`。
  function callback(GearmanTask `$task`, mixed `$context`): int
  `task`
    调用此 callback 的任务。
  `context`
    Whatever has been passed to GearmanClient::addTask() (or equivalent method) as `context`.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 参见

- GearmanClient::setCompleteCallback() - Set a function to be called on task completion
- GearmanClient::setCreatedCallback() - Set a callback for when a task is queued
- GearmanClient::setDataCallback() - Callback function when there is a data packet for a task
- GearmanClient::setExceptionCallback() - Set a callback for worker exceptions
- GearmanClient::setFailCallback() - Set callback for job failure
- GearmanClient::setStatusCallback() - Set a callback for collecting task status
- GearmanClient::setWarningCallback() - Set a callback for worker warnings
- GearmanClient::setWorkloadCallback() - Set a callback for accepting incremental data updates

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