YN string to dates

gistfile1.aw

/**
 * YN string to dates
 *
 * @param string $from
 * @param string $to
 * @param string $yn
 *
 * @return array $dates
 */
function ynToDates($from, $to, $yn)
{
    $from = strtotime($from);
    $to = strtotime($to);
    $days = (int)round(($to - $from) / 86400) + 1;

    // Validate YN string length to date range
    if($days != strlen($yn)) {
        return false;
    }
    else {
        $yn = strrev($yn);
        $dates = array();

        while($days) {
            if($yn[$days-1] == 'Y') {
                $dates[] = date('c', $to - ($days-1)*86400);
            }
            $days--;
        }

        return $dates;
    }
}

var_dump(ynToDates('2011-12-11', '2012-12-08', 'NNNNNNNNYYYYYNNNYYYYNNYYYYNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNYNNNNNNNNNNNNNNNNNNNNNNNNYNNNNNNNNNNNNNNNNNYNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNYYYYYNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN'));

Output:

array(21) {
  [0]=>
  string(25) "2011-12-19T00:00:00+01:00"
  [1]=>
  string(25) "2011-12-20T00:00:00+01:00"
  [2]=>
  string(25) "2011-12-21T00:00:00+01:00"
  [3]=>
  string(25) "2011-12-22T00:00:00+01:00"
  [4]=>
  string(25) "2011-12-23T00:00:00+01:00"
  [5]=>
  string(25) "2011-12-27T00:00:00+01:00"
  [6]=>
  string(25) "2011-12-28T00:00:00+01:00"
  [7]=>
  string(25) "2011-12-29T00:00:00+01:00"
  [8]=>
  string(25) "2011-12-30T00:00:00+01:00"
  [9]=>
  string(25) "2012-01-02T00:00:00+01:00"
  [10]=>
  string(25) "2012-01-03T00:00:00+01:00"
  [11]=>
  string(25) "2012-01-04T00:00:00+01:00"
  [12]=>
  string(25) "2012-01-05T00:00:00+01:00"
  [13]=>
  string(25) "2012-04-05T01:00:00+02:00"
  [14]=>
  string(25) "2012-04-30T01:00:00+02:00"
  [15]=>
  string(25) "2012-05-18T01:00:00+02:00"
  [16]=>
  string(25) "2012-06-25T01:00:00+02:00"
  [17]=>
  string(25) "2012-06-26T01:00:00+02:00"
  [18]=>
  string(25) "2012-06-27T01:00:00+02:00"
  [19]=>
  string(25) "2012-06-28T01:00:00+02:00"
  [20]=>
  string(25) "2012-06-29T01:00:00+02:00"
}