self::SIG* $signalName:
private function trigger(string $signalName) : void { $this->triggered = $signalName; if ($this->loggerOrCallback instanceof LoggerInterface) { $this->loggerOrCallback ->info('Received ' . $signalName); } elseif ($this->loggerOrCallback !== null) { ($this->loggerOrCallback)($signalName, $this); } }