function humanizeDuration ($secs) {
    $secs = ($secs<1)? 1 : $secs;
    $tokens = array (
      31536000 => 'year',
      2592000 => 'month',
      604800 => 'week',
      86400 => 'day',
      3600 => 'hour',
      60 => 'minute',
      1 => 'second'
    );
    foreach ($tokens as $unit => $text) {
      if ($secs < $unit) continue;
      $numberOfUnits = floor($secs / $unit);
      return $numberOfUnits.' '.$text.(($numberOfUnits>1)?'s':'');
    }
  }