<?php
          function time_since($since) 
          {
                  $chunks = array(
                          array(60 * 60 * 24 * 365 , 'year'),
                          array(60 * 60 * 24 * 30 , 'month'),
                          array(60 * 60 * 24 * 7, 'week'),
                          array(60 * 60 * 24 , 'day'),
                          array(60 * 60 , 'hour'),
                          array(60 , 'minute'),
                          array(1 , 'second')
                  );
 
                  for ($i = 0, $j = count($chunks); $i < $j; $i++) {
                          $seconds = $chunks[$i][0];
                          $name = $chunks[$i][1];
                          if (($count = floor($since / $seconds)) != 0) {
                                  break;
                          }
                  }
 
                  $print = ($count == 1) ? '1 '.$name : "$count {$name}s";
                  return $print;
          }
           $DT = strtotime("2013-04-10");
           echo time_since(time()-$DT);
 
          ?>

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