echo date("Y-m-d", strtotime("last month", strtotime("2018-12-31"))) this output 12-01
echo date("Y-m-d", strtotime("last month", strtotime("2018-12-31"))) this output 12-01
Internal processing logic:
Brother Bird made it very clear: http://www.laruence.com/2018/...
as mentioned above, this problem is due to the overflow of the date after rigid subtraction. So I added it directly to next month. The same problem occurs many times in the user's notes under the official documentation strtotime method, but few provide solutions, so turn to one of them.
attached by the way Obtaining the next month in PHP
because there is no November 31
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