/**
* Return true if $date is an occurrence.
*
* @param mixed $date
* @return bool
*/
public function occursAt($date)
{
$date = RRule::parseDate($date);
if (in_array($date, $this->cache)) {
// in the cache (whether cache is complete or not)
return true;
} elseif ($this->total !== null) {
// cache complete and not in cache
return false;
}
// test if it *should* occur (before exclusion)
$occurs = false;
foreach ($this->rdates as $rdate) {
if ($rdate == $date) {
$occurs = true;
break;
}
}
if (!$occurs) {
foreach ($this->rrules as $rrule) {
if ($rrule->occursAt($date)) {
$occurs = true;
break;
}
}
}
// if it should occur, test if it's excluded
if ($occurs) {
foreach ($this->exdates as $exdate) {
if ($exdate == $date) {
return false;
}
}
foreach ($this->exrules as $exrule) {
if ($exrule->occursAt($date)) {
return false;
}
}
}
return $occurs;
}
