Generates Event Occurr for Recurring Events

recurring_events.php

public function generateEventOccurrences()
{
	// Flush all existing occurrences
	foreach ($this->buildEventOccurrences() as $event_occurrence) {
		$event_occurrence->delete();
	}
	// Rebuild based on the new date information

	// Determine start timestamp

	$start_timestamp = $this->prepareStartDate('Y-m-d');

	if ($this->getStartTime() == NULL) {
		$start_timestamp .= ' 00:00:00';
	} else {
		$start_timestamp .= $this->prepareStartTime(' H:i:s');
	}

	$start_timestamp = new fTimestamp($start_timestamp);

	// Determine end timestamp

	if ($this->getEndDate() == NULL) {
		$end_timestamp = $this->prepareStartDate('Y-m-d');
	}

	if ($this->getEndTime() == NULL) {
		$end_timestamp .= ' 11:59:59';
	} else {
		$end_timestamp .= $this->prepareEndTime(' H:i:s');
	}

	$end_timestamp = new fTimestamp($end_timestamp);

	// Determine recurrence until

	if ($this->getRecurrenceUntil() == NULL) {
		$recurrence_until = strtotime('+5 years');
	} else {
		$recurrence_until = $this->prepareRecurrenceUntil('Y-m-d');
	}

	$recurrence_until = new fTimestamp($recurrence_until);
	$recurrence_until->adjust('+1 day')->adjust('-1 second');

	switch ($this->getRecurrence()) {
		case 'Never':
			EventOccurrence::create($this, $start_timestamp, $end_timestamp);
			break;
		case 'Daily':
			while ($start_timestamp->lt($recurrence_until)) {
				EventOccurrence::create($this, $start_timestamp, $end_timestamp);
				$start_timestamp = $start_timestamp->adjust("+{$this->getRecurrenceFrequency()} days");
				$end_timestamp   = $end_timestamp->adjust("+{$this->getRecurrenceFrequency()} days");
			}
			break;
		case 'Weekly':
			// Add the first occurance and set week to week 0
			EventOccurrence::create($this, $start_timestamp, $end_timestamp);
			$week = 0;
			while ($start_timestamp->lt($recurrence_until)) {
				$start_timestamp = $start_timestamp->adjust('+1 day');
				$end_timestamp   = $end_timestamp->adjust('+1 day');
				$current_day     = pow(2, $start_timestamp->format('w'));
				// If we've hit sunday, increment the week
				if ($current_day == 1) {
					$week++;
				}
				// If We're in an active week
				if (($week % $this->getRecurrenceFrequency()) == 0) {
					// If We're on an active day
					if (($current_day & $this->getRecurrenceDays()) == $current_day) {
						EventOccurrence::create($this, $start_timestamp, $end_timestamp);
					}
				}

			}
			break;
		case 'Monthly':
			while ($start_timestamp->lt($recurrence_until)) {
				EventOccurrence::create($this, $start_timestamp, $end_timestamp);
				$start_timestamp = $start_timestamp->adjust("+{$this->getRecurrenceFrequency()} months");
				$end_timestamp   = $end_timestamp->adjust("+{$this->getRecurrenceFrequency()} months");
			}
			break;
		case 'Yearly':
			while ($start_timestapm->lt($recurrence_until)) {
				EventOccurrence::create($this, $start_timestamp, $end_timestamp);
				// fix leapyear
				if ($start_timestamp->format('L') && $start_timestamp->format('m-d') == '02-29') {
					$start_timestamp->adjust("-1 day");
				}
				$start_timestamp = $start_timestamp->adjust("+{$this->getRecurrenceFrequency()} years");
				$end_timestamp   = $end_timestamp->adjust("+{$this->getRecurrenceFrequency()} years");
			}
			break;
	}
}