function get_freebusy_activities(&$user_focus, &$start_date_time, &$end_date_time)
{
$act_list = array();
$vcal_focus = new vCal();
$vcal_str = $vcal_focus->get_vcal_freebusy($user_focus);
$lines = explode("\n", $vcal_str);
foreach ($lines as $line) {
$dates_arr = array();
if (preg_match('/^FREEBUSY.*?:([^\\/]+)\\/([^\\/]+)/i', $line, $matches)) {
$dates_arr[] = DateTimeUtil::parse_utc_date_time($matches[1]);
$dates_arr[] = DateTimeUtil::parse_utc_date_time($matches[2]);
$act_list[] = new CalendarActivity($dates_arr);
}
}
usort($act_list, 'sort_func_by_act_date');
return $act_list;
}