PHP清除html格式的代码

$descclear = str_replace("\r","",$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);