php取上月（上周，上上周，本周）日期

简单明了 ：

上个月：

$start = date("Ym01", strtotime("last month"));$end   = date("Ym01");

上上周

$start = date("Ymd", strtotime('monday -2 week'));$end   = date("Ymd", strtotime('monday -1 week'));
上周
$start = date("Ymd", strtotime('monday last week'));$end   = date("Ymd", strtotime('monday this week'));