Detecting system signals to gracefully stop PHP script

BreakSignalDetector.php

/**
 * Usage:
 * 
 * $breakSignalDetector = new BreakSignalDetector();
 * $breakSignalDetector->registerSignalHandler();
 * 
 * while (...) // Some long running cycle
 * {
 *     ...
 *     if ($breakSignalDetector->isTerminated()) {
 *         break;
 *     }
 * }
 */
class BreakSignalDetector
{
    /** @var bool */
    private $isTerminated = false;

    public function registerSignalHandler(): void
    {
        pcntl_async_signals(true);
        pcntl_signal(SIGINT, [$this, 'terminate']);
        pcntl_signal(SIGTERM, [$this, 'terminate']);
    }

    public function terminate(): void
    {
        $this->isTerminated = true;
    }

    public function isTerminated(): bool
    {
        return $this->isTerminated;
    }
}