<?php
/*
* WebIcqLite: ICQ messages sender.
* (C) 2006 Grechishkin Alexey, http://snet-group.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* See http://www.gnu.org/copyleft/lesser.html
*
*/
    $START_TIME = time();
    
    function TimeAgo($timestamp)
    {
      
       // Store the current time
       $current_time = time();
  
       // Determine the difference, between the time now and the timestamp
       $difference = $current_time - $timestamp;
      
       // Set the periods of time
       $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
      
       // Set the number of seconds per period
       $lengths = array(1, 60, 3600, 86400, 604800, 2630880, 31570560, 315705600);

       // Determine which period we should use, based on the number of seconds lapsed.
       // If the difference divided by the seconds is more than 1, we use that. Eg 1 year / 1 decade = 0.1, so we move on
       // Go from decades backwards to seconds       
       for ($val = sizeof($lengths) - 1; ($val >= 0) && (($number = $difference / $lengths[$val]) <= 1); $val--);

       // Ensure the script has found a match
       if ($val < 0) $val = 0;
      
       // Determine the minor value, to recurse through
       $new_time = $current_time - ($difference % $lengths[$val]);
      
       // Set the current value to be floored
       $number = floor($number);
      
       // If required create a plural
       if($number != 1) $periods[$val].= "s";
  
       // Return text
       $text = sprintf("%d %s ", $number, $periods[$val]);   

       // Ensure there is still something to recurse through, and we have not found 1 minute and 0 seconds.
       if (($val >= 1) && (($current_time - $new_time) > 0)){
           $text .= TimeAgo($new_time);
       }
          
       return $text;
   }
?>