get the duration of a timestamp

gistfile1.inc

<?php

  function duration($seconds, $max_periods = 3)
  {
    $periods = array("year" => 31536000, "month" => 2419200, "week" => 604800, "day" => 86400, "hour" => 3600, "minute" => 60, "second" => 1);
    $i = 1;
    foreach ( $periods as $period => $period_seconds )
    {
        $period_duration = floor($seconds / $period_seconds);
        $seconds = $seconds % $period_seconds;
        if ( $period_duration == 0 )
        {
            continue;
        }
        $duration[] = "{$period_duration} {$period}" . ($period_duration > 1 ? 's' : '');
        $i++;
        if ( $i >  $max_periods )
        {
            break;
        }
    }

    return implode(' ', $duration);
  }