Convert second to word [RU][PHP]

<?php
/*
* Функция ConvertSecToWord($sec) позволяет получить
* лексически-грамотные предложения о оставшемся времени.
* Пример: ConvertSecToWord(123456789) выведет:
* 3 года 11 месяцев 3 дня 21 час 33 минуты 9 секунд
* !!!Внимание, обратите внимание на $this && public (ООП)
*/

 public function ConvertSecToWord($sec){
     $mes = '';
     $SecOnYear   = 31536000;
     $SecOnMonth  = 2592000;
     $SecOnWeek   = 604800;
     $SecOnDay    = 86400;
     $SecOnHour   = 3600;
     $SecOnMin    = 60;
     if (intval($sec / $SecOnYear) > 0){
         $year = intval($sec / $SecOnYear);
         $sec  = $sec - ($year * $SecOnYear);
         $mes  = $this->CorrectString($year,'year');
     }
     if (intval($sec / $SecOnMonth) > 0){
         $month = intval($sec / $SecOnMonth);
         $sec   = $sec - ($month * $SecOnMonth);
         $mes  .= $this->CorrectString($month,'month');
     }
     if (intval($sec / $SecOnWeek) > 0){
         $week = intval($sec / $SecOnWeek);
         $sec  = $sec - ($week * $SecOnWeek);
         $mes .= $this->CorrectString($week,'week');
     }
     if (intval($sec / $SecOnDay) > 0){
         $day  = intval($sec / $SecOnDay);
         $sec  = $sec - ($day * $SecOnDay);
         $mes .= $this->CorrectString($day,'day');
     }
     if (intval($sec / $SecOnHour) > 0){
         $hour = intval($sec / $SecOnHour);
         $sec  = $sec - ($hour * $SecOnHour);
         $mes .= $this->CorrectString($hour,'hour');
     }
     if (intval($sec / $SecOnMin) > 0){
         $min = intval($sec / $SecOnMin);
         $sec  = $sec - ($min * $SecOnMin);
         $mes .= $this->CorrectString($min,'min');
     }

     if ($sec > 0) $mes .= $this->CorrectString($sec,'sec');
     return $mes;
 }

 public function CorrectString($number, $type){
     $word = array('year'  => array('год'    ,'года'    ,'лет'   ),
                   'month' => array('месяц'  ,'месяца' ,'месяцев'),
                   'week'  => array('неделя' ,'недели' ,'недель' ),
                   'day'   => array('день'   ,'дня'    ,'дней'   ),
                   'hour'  => array('час'    ,'часа'   ,'часов'  ),
                   'min'   => array('минута' ,'минуты' ,'минут'  ),
                   'sec'   => array('секунда','секунды','секунд' ));
     $number = (string) $number;
     if (strlen($number) > 1){
         if ($number[strlen($number)-2].$number[strlen($number)-1] == '11'){
             $LastNum = '10';
         }else{
             $LastNum = $number[strlen($number)-1];
         }
     }else{
         $LastNum = $number[strlen($number)-1];
     }
     if ($LastNum == 1){
         $str = 0;
     }elseif($LastNum == 2 || $LastNum == 3 || $LastNum == 4){
         $str = 1;
     }else{
         $str = 2;
     }
     return ($number.' '.$word[$type][$str].' ');
 }
?>