validate($xhtml) === true){ $pagerank *= .5; } // Sergey said good news sites have // lots of nested tables reg_match_all("//", $xhtml, $tablesOnPage); if ($tablesOnPage >= 50) { $pagerank += 2; } if ($pagerank >= 5) { $pagerank = 4; // helps selling AdWords } $url3 = parse_url($_SERVER['http_referer']); if (strpos(strtolower($url3['host']), "mattcutts.com")) { // I link to "clean" sites only // – Matt, Feb 2006 $pagerank += 2; }