symfony-process/Tests/SignalListener.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

pcntl_signal(\SIGUSR1, function () {
    echo 'SIGUSR1';
    exit;
});

echo 'Caught ';

$n = 0;

while ($n++ < 400) {
    usleep(10000);
    pcntl_signal_dispatch();
}