date iteration

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Hi all, I am writing an app that runs a prize draw, wherein the admin
chooses the duration by adding a start date and number of days for the draw
to run. These values are passed into a small function that generates an
array holding the start date, end date and all dates in between as follows:

function generateDates($first, $duration) {

   $dates = array();
   $date = getdate(mktime($first));
   $month = $date['mon'];$day = $date['mday'];$year = $date['year'];

   for ($i = 1;$i <= $duration; $i++) {

       $added = getdate(mktime($day++ . "-" . $month . "-" . $year));
       $dates[] = $added['mday'] . "-" . $added['mon'] . "-" .
$added['year'];

   }
   return $dates;
}


$series = generateDates('23-05-2006', 20);
var_dump($series);

...when I var_dump the array the iteration stops at May 24 - I am looking
into it but does anyone have any ideas why this is sticking ie is my date
arithmetic wrong? Cheers.

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