$str=preg_replace("/\s+/", " ", $str); //过滤多余回车
$str=preg_replace("/[ ]+/si","",$str); //过滤__(""号后面带空格)
$str=preg_replace("/\!–.*?–>/si","",$str); //注释
$str=preg_replace("/(\!.*?)>/si","",$str); //过滤DOCTYPE
$str=preg_replace("/(\/?html.*?)>/si","",$str); //过滤html标签
$str=preg_replace("/(\/?head.*?)>/si","",$str); //过滤head标签
$str=preg_replace("/(\/?meta.*?)>/si","",$str); //过滤meta标签
$str=preg_replace("/(\/?body.*?)>/si","",$str); //过滤body标签
$str=preg_replace("/(\/?link.*?)>/si","",$str); //过滤link标签
$str=preg_replace("/(\/?form.*?)>/si","",$str); //过滤form标签
$str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签
$str=preg_replace("/(applet.*?)>(.*?)(\/applet.*?)>/si","",$str); //过滤applet标签
$str=preg_replace("/(\/?applet.*?)>/si","",$str); //过滤applet标签
$str=preg_replace("/(style.*?)>(.*?)(\/style.*?)>/si","",$str); //过滤style标签
$str=preg_replace("/(\/?style.*?)>/si","",$str); //过滤style标签
$str=preg_replace("/(title.*?)>(.*?)(\/title.*?)>/si","",$str); //过滤title标签
$str=preg_replace("/(\/?title.*?)>/si","",$str); //过滤title标签
$str=preg_replace("/(object.*?)>(.*?)(\/object.*?)>/si","",$str); //过滤object标签
$str=preg_replace("/(\/?objec.*?)>/si","",$str); //过滤object标签
$str=preg_replace("/(noframes.*?)>(.*?)(\/noframes.*?)>/si","",$str); //过滤noframes标签
$str=preg_replace("/(\/?noframes.*?)>/si","",$str); //过滤noframes标签
$str=preg_replace("/(i?frame.*?)>(.*?)(\/i?frame.*?)>/si","",$str); //过滤frame标签
$str=preg_replace("/(\/?i?frame.*?)>/si","",$str); //过滤frame标签
$str=preg_replace("/(script.*?)>(.*?)(\/script.*?)>/si","",$str); //过滤script标签
$str=preg_replace("/(\/?script.*?)>/si","",$str); //过滤script标签
$str=preg_replace("/javascript/si","Javascript",$str); //过滤script标签
$str=preg_replace("/vbscript/si","Vbscript",$str); //过滤script标签
$str=preg_replace("/on([a-z]+)\s*=/si","On\\1=",$str); //过滤script标签
$str=preg_replace("/#/si","＃",$str); //过滤script标签