public function CronRule::getNextSchedule in Ultimate Cron 7.2

Get next schedule time of rule in UNIX timestamp format.

Return value

int UNIX timestamp of next schedule time.

File

./CronRule.class.php, line 380

This class parses cron rules and determines last execution time using least case integer comparison.

Class

CronRule

@file This class parses cron rules and determines last execution time using least case integer comparison.

Code

public function getNextSchedule() {
  $time = $this->time;
  $last_schedule = $this
    ->getLastSchedule();
  $next_schedule = NULL;

  // If the rule can't be parsed we don't proceed as this could lead to an
  // infinite loop.
  if (!$this
    ->parseRule()) {
    return $next_schedule;
  }

  // Do a binary search for the next schedule.
  $interval = 86400 * 30;
  $offset = $interval;
  do {
    $test = new CronRule($this->rule, $time + (int) $offset, $this->skew);
    $schedule = $test
      ->getLastSchedule();
    $interval /= 2;
    if ($schedule > $last_schedule) {
      $next_schedule = $schedule;
      $offset -= $interval;
    }
    elseif ($next_schedule) {
      $offset += $interval;
    }
    else {

      // Increase interval by doubling up.
      // (we've already halved it, so now we quadrouple it).
      $offset = $interval *= 4;
    }
  } while ($interval > 30);
  return $next_schedule;
}