Convert UNIX timestamp to days hours minute seconds

GetTimeDiff.php

<?php
function GetTimeDiff($timestamp) 
{
    $how_log_ago = '';
    $seconds = time() - $timestamp; 
    $minutes = (int)($seconds / 60);
    $hours = (int)($minutes / 60);
    $days = (int)($hours / 24);
    if ($days >= 1) {
      $how_log_ago = $days . ' day' . ($days != 1 ? 's' : '');
    } else if ($hours >= 1) {
      $how_log_ago = $hours . ' hour' . ($hours != 1 ? 's' : '');
    } else if ($minutes >= 1) {
      $how_log_ago = $minutes . ' minute' . ($minutes != 1 ? 's' : '');
    } else {
      $how_log_ago = $seconds . ' second' . ($seconds != 1 ? 's' : '');
    }
    return $how_log_ago;
}
?>