PHP常用时间戳获取 昨天,明天,上周，本月

//昨天0时时间戳
$yesterday_zero = strtotime(date('Y-m-d')) - 3600 * 24;
//昨天此时时间戳
$yesterday_now = strtotime('-1 day');
//本周一时间戳
$week_this_monday = strtotime('last Monday');
//明天时间戳
$tomorrow = strtotime("+1 day");
//上周一时间戳
$week_last_monday = strtotime('last Monday') - 3600 * 24 * 7;
//上周日时间戳
$week_last_sunday = strtotime('last Monday') - 3600 * 24;
//本月第一天时间戳
$month_first = strtotime(date("Y") . "-" . date("m") . "-1");
//本月最后一天时间戳
$month_last = strtotime(date("Y") . "-" . date("m") . "-" . date("t"));
//获取上个月第一天及最后一天
echo date('Y-m-01', strtotime('-1 month'));
echo "<br/>";
echo date('Y-m-t', strtotime('-1 month'));