Last day of given month and year and last day of previous month in PHP

gistfile1.txt

        $current_month = 3;
        $current_year = 2020;
        
        //first day of previous month from given month and year
        $firstDayOfLastMonth = date_create($current_year.'-'.$current_month.'-01 first day of last month')->format('Y-m-d');
        
        //last day of previous month from given month and year
        $lastDayOfLastMonth = date_create($current_year.'-'.$current_month.'-01 last day of last month')->format('Y-m-d');
        
        //first day of given month and year
        $firstDayOfCurrentMonth = date("Y-m-d",strtotime($current_year.'-'.$current_month.'-01'));
        
        //last day of given month and year
        $lastDayOfCurrentMonth = date("Y-m-t",strtotime($current_year.'-'.$current_month.'-01'));