php common functions

Get the time from the 1st to the last day of the previous month:

echo date('Y-m-01', strtotime('-1 month'));
echo '
';
echo date('Y-m-t ', strtotime('-1 month'));

and the following

echo date('Y-m-01 00:00:00', strtotime('-1 month'));
echo 'echo date('Y-m-t 23:59:59', strtotime('-1 month'));

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The above has introduced the commonly used functions of PHP, including related content. I hope it will be helpful to friends who are interested in PHP tutorials.