Contao\FrontendCron::run PHP Method

    public function run()
    {
        $objResponse = new Response();
        // Do not run if there is POST data or the last execution was less than a minute ago
        if (!empty($_POST) || $this->hasToWait()) {
            return $objResponse;
        }
        $arrLock = array();
        $arrIntervals = array('monthly', 'weekly', 'daily', 'hourly', 'minutely');
        // Store the current timestamps
        $arrCurrent = array('monthly' => date('Ym'), 'weekly' => date('YW'), 'daily' => date('Ymd'), 'hourly' => date('YmdH'), 'minutely' => date('YmdHi'));
        // Get the timestamps from tl_cron
        $objLock = $this->Database->query("SELECT * FROM tl_cron WHERE name !='lastrun'");
        while ($objLock->next()) {
            $arrLock[$objLock->name] = $objLock->value;
        }
        // Create the database entries
        foreach ($arrIntervals as $strInterval) {
            if (!isset($arrLock[$strInterval])) {
                $arrLock[$strInterval] = 0;
                $this->Database->query("INSERT INTO tl_cron (name, value) VALUES ('{$strInterval}', 0)");
            }
        }
        // Run the jobs
        foreach ($arrIntervals as $strInterval) {
            $intCurrent = $arrCurrent[$strInterval];
            // Skip empty intervals and jobs that have been executed already
            if (empty($GLOBALS['TL_CRON'][$strInterval]) || $arrLock[$strInterval] == $intCurrent) {
                continue;
            }
            // Update the database before the jobs are executed, in case one of them fails
            $this->Database->query("UPDATE tl_cron SET value={$intCurrent} WHERE name='{$strInterval}'");
            // Add a log entry if in debug mode (see #4729)
            if (\Config::get('debugMode')) {
                $this->log('Running the ' . $strInterval . ' cron jobs', __METHOD__, TL_CRON);
            }
            foreach ($GLOBALS['TL_CRON'][$strInterval] as $callback) {
                $this->import($callback[0]);
                $this->{$callback[0]}->{$callback[1]}();
            }
            // Add a log entry if in debug mode (see #4729)
            if (\Config::get('debugMode')) {
                $this->log(ucfirst($strInterval) . ' cron jobs complete', __METHOD__, TL_CRON);
            }
        }
        return $objResponse;
    }

 /**
  * Runs the command scheduler.
  *
  * @return Response
  *
  * @Route("/_contao/cron", name="contao_frontend_cron")
  */
 public function cronAction()
 {
     $this->container->get('contao.framework')->initialize();
     $controller = new FrontendCron();
     return $controller->run();
 }