# event_timer_set

(PECL libevent >= 0.0.2)

event_timer_set — Prepare a timer event

### 说明

event_timer_set ( resource `$event` , callable `$callback` [, mixed `$arg` ] ) : bool

Prepares the timer event to be used in event_add(). The event is prepared to call the function specified by the `callback` when the event timeout elapses.

After initializing the event, use event_base_set() to associate the event with its event base.

In case of matching event, these three arguments are passed to the `callback` function:

`fd`

  Signal number or resource indicating the stream.

`events`

  A flag indicating the event. This will always be `EV_TIMEOUT` for timer events.

`arg`

  Optional parameter, previously passed to event_timer_set() as `arg`.

### 参数

`event`

  Valid event resource.

`callback`

  Callback function to be called when the matching event occurs.

`arg`

  Optional callback parameter.

### 返回值

成功时返回 `TRUE`， 或者在失败时返回 `FALSE`。