[PHP] Dashboard 開發筆記 - 透過 date 和 strtotime 產生日期變化

開發 Dashboard 時，需要一些時間變化，這時可以靠 strtotime 來幫忙轉，十分方便

$ cat /tmp/t.php
<?php

echo date("Y/m/d")."\n";
echo date("Y/m/d", strtotime(date("Y/m/d")." -1 day"))."\n";
echo date("Y/m/d", strtotime(date("Y/m/d")." -2 day"))."\n";
echo date("Y/m/d", strtotime(date("Y/m/d")." -7 day"))."\n";
echo date("Y/m/d", strtotime(date("Y/m/d")." -8 day"))."\n";
echo date("Y/m/d", strtotime(date("Y/m/d")." -30 day"))."\n";
echo date("Y/m/d", strtotime(date("Y/m/d")." -31 day"))."\n";
echo date("Y/m/d", strtotime(date("Y/m/d")." -60 day"))."\n";


$ php /tmp/t.php
2018/10/22
2018/10/21
2018/10/20
2018/10/15
2018/10/14
2018/09/22
2018/09/21
2018/08/23