What is the best way to determine the number of days in a past month using PHP?

To determine the number of days in a past month using PHP, you can use the `cal_days_in_month` function. This function takes the year and month as parameters and returns the number of days in that month. By subtracting 1 from the current month, you can get the previous month and then use `cal_days_in_month` to find the number of days in that month. 

$year = date('Y');
$prev_month = date('n') - 1;
$days_in_prev_month = cal_days_in_month(CAL_GREGORIAN, $prev_month, $year);

echo "Number of days in the previous month: " . $days_in_prev_month;

Keywords

PHP date function number of days past month

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