$descclear = str_replace("\r","",$descclear);//过滤换行

$descclear = str_replace("\n","",$descclear);//过滤换行

$descclear = str_replace("\t","",$descclear);//过滤换行

$descclear = str_replace("\r\n","",$descclear);//过滤换行

$descclear = preg_replace("/\s+/", " ", $descclear);//过滤多余回车

$descclear = preg_replace("//si","",$descclear); //过滤html注释

$descclear = preg_replace("//si","",$descclear); //过滤DOCTYPE

$descclear = preg_replace("//si","",$descclear); //过滤html标签

$descclear = preg_replace("//si","",$descclear); //过滤head标签

$descclear = preg_replace("//si","",$descclear); //过滤meta标签

$descclear = preg_replace("//si","",$descclear); //过滤body标签

$descclear = preg_replace("//si","",$descclear); //过滤link标签

$descclear = preg_replace("//si","",$descclear); //过滤form标签

$descclear = preg_replace("/cookie/si","COOKIE",$descclear); //过滤COOKIE标签

$descclear = preg_replace("/(.*?)/si","",$descclear); //过滤applet标签

$descclear = preg_replace("//si","",$descclear); //过滤applet标签

$descclear = preg_replace("/(.*?)/si","",$descclear); //过滤style标签

$descclear = preg_replace("//si","",$descclear); //过滤style标签

$descclear = preg_replace("/(.*?)/si","",$descclear); //过滤title标签

$descclear = preg_replace("//si","",$descclear); //过滤title标签

$descclear = preg_replace("/(.*?)/si","",$descclear); //过滤object标签

$descclear = preg_replace("//si","",$descclear); //过滤object标签

$descclear = preg_replace("/(.*?)/si","",$descclear); //过滤noframes标签

$descclear = preg_replace("//si","",$descclear); //过滤noframes标签

$descclear = preg_replace("/(.*?)/si","",$descclear); //过滤frame标签

$descclear = preg_replace("//si","",$descclear); //过滤frame标签

$descclear = preg_replace("/(.*?)/si","",$descclear); //过滤script标签

$descclear = preg_replace("//si","",$descclear); //过滤script标签

$descclear = preg_replace("/javascript/si","Javascript",$descclear); //过滤script标签

$descclear = preg_replace("/vbscript/si","Vbscript",$descclear); //过滤script标签

$descclear = preg_replace("/on([a-z]+)\s*=/si","On\\1=",$descclear); //过滤script标签

$descclear = preg_replace("//si","&＃",$descclear); //过滤script标签，如javAsCript:alert();

//使用正则替换

$pat = "/]*?)>/isU";

$descclear = preg_replace($pat,"",$descclear);