Handle signals gracefully in long running workers

signals.php

<?php

echo 'My PID = ' . posix_getpid() . "\n";

abstract class AbstractWorker
{

    private $loopNumber = 0;
    private $shouldRun = true;

    public function __construct()
    {
        pcntl_signal(SIGTERM, function($signum) {
            $this->shouldRun = false;
        });
    }

    protected function getJob()
    {
        return $this->loopNumber++;
    }

    public function start()
    {
        while ($this->shouldRun) {
            $this->doWork($this->getJob());
            pcntl_signal_dispatch();
        }
    }

    abstract public function doWork($job);
}


class Worker extends AbstractWorker
{

    public function doWork($job)
    {
        for ($i = 0; $i < 5; $i++) {
            // simulate stuff
            print "{$job} {$i}\n";
            sleep(1);
        }
    }

}

(new Worker)->start();

$ kill $PID

will wait for the inner loop to complete