function constrain($events, $gmt_start = null, $gmt_end = null, $limit = null)
{
$repeats = ICalEvents::collapse_repeats($events, $gmt_start, $gmt_end, $limit);
if (is_array($repeats) and count($repeats) > 0) {
$events = array_merge($events, $repeats);
}
$events = ICalEvents::sort_by_key($events, 'StartTime');
if (!$limit) {
$limit = count($events);
}
$constrained = array();
$count = 0;
foreach ($events as $event) {
if (ICalEvents::falls_between($event, $gmt_start, $gmt_end)) {
$constrained[] = $event;
++$count;
}
if ($count >= $limit) {
break;
}
}
return $constrained;
}
