Php function to get the last day of a month

Here is a function that would get the last day of a given month as a date in format Y-m-d. It first adds 1 month to the 1st date of the given month, then subtracts 1 second from the resulting date which brings back to the last date of the given month.

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/**     Last date of a month of a year           @param[in] $month - Integer. Default = Current Month     @param[in] $year - Integer. Default = Current Year           @return Last date of the month and year in yyyy-mm-dd format */ function last_day($month = '', $year = '') {    if (empty($month))    {       $month = date('m');    }         if (empty($year))    {       $year = date('Y');    }         $result = strtotime("{$year}-{$month}-01");    $result = strtotime('-1 second', strtotime('+1 month', $result));      return date('Y-m-d', $result); }