elapsed time r1

<?php
/*---
  time_dif  elapsed time function
  SYNOPSIS elapsed_time = time_diff(time1,time2,lang)
  INPUT
        time1          : start time; time on unix timestamp format
        time2          : end time; time on unix timestamp format
        lang (otional) : language; string 'id' bahasa indonesia, 'en' english ; default 'id'
  OUTPUT
        elapsed_time   : elapsed time between time1 and time2, string
  --- */
function time_diff($time1,$time2,$lang='id')
{
  $text=Array(
    'id'=>Array('hari','jam','menit','detik'),
    'en'=>Array('day[s]','hour[s]','minute[s]','second[s]')
    );
  $ret='';
  $tokens = Array(86400,3600,60,1);
  $difference = $time2 - $time1;
  foreach ($tokens as $id => $value) {
    if ($difference < $value) continue;
    $numberOfUnits = floor($difference / $value);
    $difference %= $value;
    $ret.=$numberOfUnits.' '.$text[$lang][$id].' ';
  }
  return $ret;
}