# Event::signal

(PECL event >= 1.2.6-beta)

Event::signal — Constructs signal event object

### 说明

public static Event::signal(
EventBase `$base` ,
int `$signum` ,
callable `$cb` ,
mixed `$arg` = ?
): Event

Constructs signal event object. This is a straightforward method to create a signal event. Note, the generic Event::__construct() method can contruct signal event objects too.

### 参数

`base`

  The associated event base object.

`signum`

  The signal number.

`cb`

  The signal event callback. See Event callbacks.

`arg`

  Custom data. If specified, it will be passed to the callback when event triggers.

### 返回值

Returns Event object on success. Otherwise `false`.

### 参见

- Constructing signal events

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