note 102813 added to dateinterval.format

This is a modification and re-post of kuzb posts http://www.php.net/manual/en/dateinterval.format.php#102271. 

Fix: to_seconds function to include minutes.

Here is the complete post with modifications:

Quick class to allow you to input a time in any unit, and have it recalculate in to different denominations (for example, seconds to hours, minutes and seconds):

<?php
    class DateIntervalEnhanced extends DateInterval
    {

      /* Keep in mind that a year is seen in this class as 365 days, and a month is seen as 30 days.        
         It is not possible to calculate how many days are in a given year or month without a point of 
         reference in time.*/
      public function to_seconds()
      {
        return ($this->y * 365 * 24 * 60 * 60) +
               ($this->m * 30 * 24 * 60 * 60) +
               ($this->d * 24 * 60 * 60) +
               ($this->h * 60 * 60) +
               ($this->i * 60) +
               $this->s;
      }
     
      public function recalculate()
      {
        $seconds = $this->to_seconds();
        $this->y = floor($seconds/60/60/24/365);
        $seconds -= $this->y * 31536000;
        $this->m = floor($seconds/60/60/24/30);
        $seconds -= $this->m * 2592000;
        $this->d = floor($seconds/60/60/24);
        $seconds -= $this->d * 86400;
        $this->h = floor($seconds/60/60);
        $seconds -= $this->h * 3600;
        $this->i = floor($seconds/60);
        $seconds -= $this->i * 60;
        $this->s = $seconds;
      }
    }

    // Example usage
    $di = new DateIntervalEnhanced('PT3600S');
    $di->recalculate();
    // outputs 1:0:0 instead of 0:0:3600 now!
    echo $di->format('%H:%i:%s');
?>
----
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Manual Page -- http://www.php.net/manual/en/dateinterval.format.php
Edit        -- https://master.php.net/note/edit/102813
Del: integrated  -- https://master.php.net/note/delete/102813/integrated
Del: useless     -- https://master.php.net/note/delete/102813/useless
Del: bad code    -- https://master.php.net/note/delete/102813/bad+code
Del: spam        -- https://master.php.net/note/delete/102813/spam
Del: non-english -- https://master.php.net/note/delete/102813/non-english
Del: in docs     -- https://master.php.net/note/delete/102813/in+docs
Del: other reasons-- https://master.php.net/note/delete/102813
Reject      -- https://master.php.net/note/reject/102813
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