$output = str_replace('</body>', '<center><span class="smallfont">[Output: ' . $page_kilobyte . ' Kb. compressed to <b>' . $pagenew_kilobyte . '</b> Kb. by saving <b>' . $pagesaved_kilobyte . '</b> Kb. (' . $pagesaved_perc . '%)]</span></center></body>', $output);