<?php
function ago($time)
{
   $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
   $lengths = array("60","60","24","7","4.35","12","10");
 
   $now = time();
 
       $difference     = $now - $time;
       $tense         = "ago";
 
   for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
       $difference /= $lengths[$j];
   }
 
   $difference = round($difference);
 
   if($difference != 1) {
       $periods[$j].= "s";
   }
 
   return "$difference $periods[$j] 'ago' ";
}
?>

function secondsToString($seconds){
    $bit = array(
        'h' => floor($seconds/3600),
        'm' => floor($seconds/60) % 60,
        's' => $seconds % 60
    );
 
    foreach($bit as $key => $value)
        if ($value > 0) $ret[] = $value . $key;
 
    return join('', $ret);
}