Convert timestamp to "X hours since"

get-human-time.php

<?php
function get_human_time($timestamp) {
  $since = time() - $timestamp;

  $chunks = array(
    array(60 * 60 * 24 * 365, 'year', 'years'),
    array(60 * 60 * 24 * 30, 'month', 'months'),
    array(60 * 60 * 24 * 7, 'week', 'weeks'),
    array(60 * 60 * 24, 'day', 'days'),
    array(60 * 60, 'hour', 'hours'),
    array(60, 'minute', 'minutes'),
    array(1, 'second', 'seconds')
  );

  for ($i = 0, $j = count($chunks); $i < $j; $i++) {
    $seconds = $chunks[$i][0];
    $name = $chunks[$i][1];
    $names = $chunks[$i][2];
    if (($count = floor($since / $seconds)) != 0)
      break;
  }

  $print = ($count == 1) ? '1 '.$name : $count.' '.$names;
  return $print.' ago';
}