Laravel Artisan Queue Ensurer - Set a cron job to run this file periodically to ensure that Laravel's queue is processing all the time. If the queue listener was down, it would restart it!

queue-ensure.php

<?php

function runCommand ()
{
    $command = 'php artisan queue:listen > /dev/null & echo $!';
    $number = exec($command);
    file_put_contents(__DIR__ . '/queue.pid', $number);
}

if (file_exists(__DIR__ . '/queue.pid')) {
    $pid = file_get_contents(__DIR__ . '/queue.pid');
    $result = exec('ps | grep ' . $pid);
    if ($result == '') {
        runCommand();
    }
} else {
    runCommand();
}