今日 昨日 本月
if ($kind == 'today') {
$begin = strtotime(date('Y-m-d', TIMESTAMP));
$end = TIMESTAMP;
} else if ($kind == 'yesterday') {
$end = strtotime(date('Y-m-d', TIMESTAMP));
$begin = $end - 86400;
} else if ($kind == 'month') {
$begin = mktime(0, 0, 0, date('n', TIMESTAMP), 1, date('Y', TIMESTAMP));
$end = TIMESTAMP;
}前几天
$begin = strtotime(date('Ymd', TIEMSTAMP)) - ($day - 1) * 86400;
