PHP strtotime +1 month behaviour

Question

I know about the unwanted behaviour of PHP\'s function

strtotime

For example, when adding a month (+1

Answer 1

Here's the algorithm you can use. It should be simple enough to implement yourself.

• Have the original date and the +1 month date in variables
• Extract the month part of both variables
• If the difference is greater than 1 month (or if the original is December and the other is not January) change the latter variable to the last day of the next month. You can use for example t in date() to get the last day: date( 't.m.Y' )

Answer 2

function ldom($m,$y){

     //return tha last date of a given month based on the month and the year 
    //(factors in leap years)

    $first_day= strtotime (date($m.'/1/'.$y));
    $next_month = date('m',strtotime ( '+32 day' , $first_day)) ;   
    $last_day= strtotime ( '-1 day' , strtotime (date($next_month.'/1/'.$y)) ) ;
    return $last_day;       

}