Useful for cronjobs, to run only once at the same time.

runonce_helper.php

<?php
function runonce($name, Closure $closure)
{
    $lockname = $name . '.pid';
    try {
        if(!Cache::has($lockname)) {
            Cache::forever($lockname, getmypid());

            if ($closure instanceof Closure) {
                $closure = call_user_func($closure);
            }

            Cache::forget($lockname);
        } else {
            Log::info($lockname.' is already running');
        }
    } catch (Exception $e) {
        Cache::forget($lockname);
        Log::error($e->getMessage());
    }
}