Send signal to the child processes.

# Swoole\Process::signal

(PECL swoole >= 1.9.0)

Swoole\Process::signal — Send signal to the child processes.

### 说明

public static function Swoole\Process::signal(string `$signal_no`, callable `$callback`): void

### 参数

`signal_no`

`callback`

### 返回值

If signal sent successfully, it returns TRUE, otherwise it returns FALSE.

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