更新 以下是我原来的问题。看到我的答案，看看我是如何解决它的。
我正在尝试使用来自MySQL数据库表＆churchcal_events＆＃39;的事件来填充我的日历。我可能会为特定日期和周期性事件设置一次性事件，可以设置为每周一，每隔周四或第二个星期五的每个月。
一次性活动没问题。每周活动（每周，每隔一次）都有效。但每个月的活动仅在第一个月显示，而不是在之后的几个月显示。
churchcal_events表 - 排除对此问题不重要的字段
+----+----------------+------------+-----------+------------+------------+
| id | name | recurring | frequency | recur_type | recur_day |
+----+----------------+------------+-----------+------------+------------+
| 1 | Test Weekly | 1 | 1 | W | Sunday |
| 2 | Test Bi-Weekly | 1 | 2 | W | Monday |
| 3 | Test Monthly | 1 | 1 | M | Friday |
+----+----------------+------------+-----------+------------+------------+
php代码 - 在每月的每一天的循环内
//query all events
$get_events = db_query("SELECT * FROM {churchcal_events}
WHERE (MONTH(date) = :month AND YEAR(date) = :year AND DAY(date) = :day) OR
(recurring = :recur AND recur_day LIKE :calendar_day)
ORDER BY starttime",
array(
':month' => $month,
':year' => $year,
':day' => $list_day,
':recur' => '1',
':calendar_day' => '%' . date('l', strtotime($month . '/' . $list_day . '/' . $year)) . '%',
));
foreach($get_events as $event) {
//see if events belong to this calendar
$calendar_assign = db_query("SELECT * FROM {churchcal_assign} WHERE event_id = :event_id AND calendar_id = :cal_id",
array(
':event_id' => $event->id,
':cal_id' => $cal_id,
));
if($calendar_assign->rowCount() > 0) {
//if recurring, see if event should be on this day
if($event->recurring == '1') {
$recur_day = $event->recur_day;
$recur_freq = $event->frequency;
$recur_type = $event->recur_type;
$recur_start = new DateTime(date('Y-m-d', strtotime($event->recur_start)));
$recur_end = new DateTime(date('Y-m-d', strtotime($event->recur_end)));
$recur_start->modify($recur_day);
$recur_interval = new DateInterval("P{$recur_freq}{$recur_type}");
$recur_period = new DatePeriod($recur_start, $recur_interval, $recur_end);
foreach($recur_period as $recur_date) {
if($recur_date->format('Ymd') == date('Ymd', strtotime($month . '/' . $list_day . '/' . $year))) {
$calendar .= calendar_event($event-id, $event->name, $event->starttime);
}
}
}
如何制作ID＆＃39; 3＆＃39;从示例churchcal_events表中显示每个月的第一个星期五？
答案 0 :(得分：10)
如果有人愿意做类似的事情，我会在最近五个小时内发布我编写和测试过的代码。
我决定将我的两个表转换成三个表，将所有重复选项移到第三个表中：
'churchcal_events' - 我还没有包含此事件信息的其他字段
+----+-----------+------------+------------+------------+-----------+
| id | name | date | starttime | endtime | recurring |
+----+-----------+------------+------------+------------+-----------+
| 1 | Event 1 | 2013-04-01 | 10:30:00 | 12:00:00 | 0 |
| 2 | Event 2 | | 14:00:00 | 15:00:00 | 1 |
| 3 | Event 3 | | 09:00:00 | | 1 |
| 4 | Event 4 | | 19:00:00 | 21:00:00 | 1 |
+----+-----------+------------+------------+------------+-----------+
'churchcal_assign' - 将事件路由到适当的日历（因为整个网站的不同部门都会有日历）
+----------+-------------+
| event_id | calendar_id |
+----------+-------------+
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
+----------+-------------+
'churchcal_recur_events' - 以下是每个事件重复发生的规则
+----------+-----------+------------+----------------+------------+-------------+-----------+
| event_id | frequency | recur_type | recur_day_num | recur_day | recur_start | recur_end |
+----------+-----------+------------+----------------+------------+-------------+-----------+
| 2 | 1 | Week | NULL | Sunday | NULL | NULL |
| 3 | 2 | Week | NULL | Wednesday | 2013-04-01 | NULL |
| 4 | 2 | Month | third | Friday | 2013-04-01 | NULL |
+----------+-----------+------------+----------------+------------+-------------+-----------+
新代码（PHP） - 这是一天的循环
//query all events
$get_events = db_query("SELECT * FROM {churchcal_events ce, churchcal_recur_events cre}
WHERE (MONTH(ce.date) = :month AND YEAR(ce.date) = :year AND DAY(ce.date) = :day) OR
(ce.id = cre.event_id AND ce.recurring = :recur AND cre.recur_day = :calendar_day)
ORDER BY starttime",
array(
':month' => $month,
':year' => $year,
':day' => $list_day,
':recur' => '1',
':calendar_day' => date('l', strtotime($month . '/' . $list_day . '/' . $year)),
));
foreach($get_events as $event) {
//see if events belong to this calendar
$calendar_assign = db_query("SELECT * FROM {churchcal_assign} WHERE event_id = :event_id AND calendar_id = :cal_id",
array(
':event_id' => $event->id,
':cal_id' => $cal_id,
));
if($calendar_assign->rowCount() > 0) {
//one-time events
if(($event->recurring != '1') && ($single_event_id != $event->id)) {
$calendar .= calendar_event($event->id, $event->name, $event->starttime);
$single_event_id = $event->id;
//$calendar .= $single_event_id;
}
//monthly recurring events
if(($event->recur_type == 'Month') && ($event->recurring == '1')
//day is on or before end date
&& (($event->recur_end >= date('Y-m-d', strtotime($month . '/' . $list_day . '/' . $year))) || ($event->recur_end == '0000-00-00') || ($event->recur_end == NULL))
//day is on or after start date
&& (($event->recur_start <= date('Y-m-d', strtotime($month . '/' . $list_day . '/' . $year))) || ($event->recur_start == '0000-00-00') || ($event->recur_start == NULL))
//day is equal to date of recurrence, i.e. first friday, third monday, etc
&& ($year . date('m', strtotime($year . '/' . $month . '/' . $list_day)) . $list_day == date('Ymj', strtotime($event->recur_day_num . ' ' . $event->recur_day . ' of ' . date('F', strtotime($month . '/' . $list_day . '/' . $year)) . ' ' . $year)))
//day is in agreement with month frequency, i.e. every month, every other, etc. from start date
&& ($month % $event->frequency == date('m', strtotime($event->recur_start)) % $event->frequency)) {
$calendar .= calendar_event($event->id, $event->name, $event->starttime);
}
//weekly recurring events
if(($event->recur_type == 'Week') && ($event->recurring == '1')
//day is on or before end date
&& (($event->recur_end >= date('Y-m-d', strtotime($month . '/' . $list_day . '/' . $year))) || ($event->recur_end == '0000-00-00') || ($event->recur_end == NULL))
//day is on or after start date
&& (($event->recur_start <= date('Y-m-d', strtotime($month . '/' . $list_day . '/' . $year))) || ($event->recur_start == '0000-00-00') || ($event->recur_start == NULL))
//day is in agreement with week frequency, i.e. every week, every other, etc. from start date
&& (date('W', strtotime($month . '/' . $list_day . '/' . $year)) % $event->frequency == date('W', strtotime($event->recur_start)) % $event->frequency)) {
$calendar .= calendar_event($event->id, $event->name, $event->starttime);
}
}
}
如果您不是像我一样在Drupal模块中创建它，您可以将'db_query（）'替换为您自己的数据库查询函数，如PHP的默认'mysql_query（）';