獲取今天的起始時間
~~~
$dayStart = strtotime(date('Y-m-d'));
$dayEnd = strtotime(date('Y-m-d') . ' + 1 days');
~~~
獲取本周起始時間
~~~
$weekStart = strtotime(date('Y-m-d') . '-' . (date('w') ? date('w') - 1 : 6) . ' days');
$weekEnd = strtotime(date('Y-m-d', $weekStart) . ' + 6 days');
~~~
獲取本月起始時間
~~~
$monthStart = strtotime(date('Y-m') . '-01 00:00:00');
$monthEnd = strtotime(date('Y-m', $monthStart) . '+ 1 months - 1 days');
~~~
獲取本年起始時間
~~~
$yearStart = strtotime(date('Y') . '-01-01 00:00:00');
$yearend = strtotime(date('Y', $yearStart) . '+ 1 years - 1 days');
~~~
