php過濾html

$str=preg_replace("/s+/", " ", $str); //過濾多餘斷行符號
$str=preg_replace("/<[ ]+/si","<",$str); //過濾<__("<"號後面帶空格)
   
$str=preg_replace("/<!--.*?-->/si","",$str); //注釋
$str=preg_replace("/<(!.*?)>/si","",$str); //過濾DOCTYPE
$str=preg_replace("/<(/?html.*?)>/si","",$str); //過濾html標籤

$str=preg_replace("/(?=href=)([^>]*)(?=>)/i","",$str); //過濾a標籤
$str=preg_replace("/<(/?head.*?)>/si","",$str); //過濾head標籤
$str=preg_replace("/<(/?meta.*?)>/si","",$str); //過濾meta標籤
$str=preg_replace("/<(/?body.*?)>/si","",$str); //過濾body標籤
$str=preg_replace("/<(/?link.*?)>/si","",$str); //過濾link標籤
$str=preg_replace("/<(/?form.*?)>/si","",$str); //過濾form標籤
$str=preg_replace("/cookie/si","COOKIE",$str); //過濾COOKIE標籤
   
$str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*?)>/si","",$str); //過濾applet標籤
$str=preg_replace("/<(/?applet.*?)>/si","",$str); //過濾applet標籤
   
$str=preg_replace("/<(style.*?)>(.*?)<(/style.*?)>/si","",$str); //過濾style標籤
$str=preg_replace("/<(/?style.*?)>/si","",$str); //過濾style標籤
   
$str=preg_replace("/<(title.*?)>(.*?)<(/title.*?)>/si","",$str); //過濾title標籤
$str=preg_replace("/<(/?title.*?)>/si","",$str); //過濾title標籤
   
$str=preg_replace("/<(object.*?)>(.*?)<(/object.*?)>/si","",$str); //過濾object標籤
$str=preg_replace("/<(/?objec.*?)>/si","",$str); //過濾object標籤
   
$str=preg_replace("/<(noframes.*?)>(.*?)<(/noframes.*?)>/si","",$str); //過濾noframes標籤
$str=preg_replace("/<(/?noframes.*?)>/si","",$str); //過濾noframes標籤
   
$str=preg_replace("/<(i?frame.*?)>(.*?)<(/i?frame.*?)>/si","",$str); //過濾frame標籤
$str=preg_replace("/<(/?i?frame.*?)>/si","",$str); //過濾frame標籤
   
$str=preg_replace("/<(script.*?)>(.*?)<(/script.*?)>/si","",$str); //過濾script標籤
$str=preg_replace("/<(/?script.*?)>/si","",$str); //過濾script標籤
$str=preg_replace("/javascript/si","Javascript",$str); //過濾script標籤
$str=preg_replace("/vbscript/si","Vbscript",$str); //過濾script標籤
$str=preg_replace("/on([a-z]+)s*=/si","On/1=",$str); //過濾script標籤
$str=preg_replace("/&#/si","&＃",$str); //過濾script標籤，如javAsCript:alert(）