For this, we will create a simple function to return days in a given month.
Calculate Days In A Month - PHP

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I should mention that PHP also offers a cal_days_in_month function for PHP 4.0.7 and higher, but I prefer using the below function because it is guaranteed to work on all PHP version without any issues because it is based on logic.
get_days_in_month($month, $year)
function get_days_in_month($month, $year){
return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year %400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31);
}
This function provide days in month for all years including leap years.