# MongoDB\Driver\Monitoring\CommandSubscriber::commandFailed

(mongodb >=1.3.0)

MongoDB\Driver\Monitoring\CommandSubscriber::commandFailed — Notification method for a failed command

### 说明

abstract public MongoDB\Driver\Monitoring\CommandSubscriber::commandFailed(MongoDB\Driver\Monitoring\CommandFailedEvent `$event`): void

If the subscriber is registered, this method is called when a command fails.

### 参数

`event` (MongoDB\Driver\Monitoring\CommandFailedEvent)

  An event object encapsulating information about the failed command.

### 返回值

没有返回值。

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### 参见

- MongoDB\Driver\Monitoring\CommandFailedEvent
- MongoDB\Driver\Monitoring\addSubscriber() - Registers a monitoring event subscriber globally
- MongoDB\Driver\Manager::addSubscriber() - Registers a monitoring event subscriber with this Manager
- Application Performance Monitoring (APM)

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