Creates EvSignal watcher object associated with the current event loop instance

# EvLoop::signal

(PECL ev >= 0.2.0)

EvLoop::signal — Creates EvSignal watcher object associated with the current event loop instance

### 说明

final public function EvLoop::signal(
int `$signum` ,
callable `$callback` ,
mixed `$data` = `null` ,
int `$priority` = 0
): EvSignal

Creates EvSignal watcher object associated with the current event loop instance

### 参数

All parameters have the same meaning as for EvSignal::__construct()

### 返回值

Returns EvSignal object on success

### 参见

- EvSignal::__construct() - Constructs EvSignal watcher object

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