Monitors the `motion` process because it crashes at certain intervals

motion_watchdog_monitor.php

<?php

$ts = (int)file_get_contents('/tmp/wd_mt');

if (time() - 60 < $ts) {
        exit();
}

do {
        file_put_contents('/tmp/wd_mt', time());
        $std = [];
        $output = exec('ps ax | grep motion | grep -v grep', $std);

        if (empty($std)) {
                exec('/usr/sbin/service motion restart');
        }
        sleep(3);
} while (true);