php正則過濾HTML

$str=preg_replace("/\s+/", " ", $str); //過濾多餘回車
$str=preg_replace("/<[ ]+/si","<",$str); //過濾<__("<"號後面帶空格)

$str=preg_replace("/<\!--.*?-->/si","",$str); //註釋
$str=preg_replace("/<(\!.*?)>/si","",$str); //過濾DOCTYPE
$str=preg_replace("/<(\/?html.*?)>/si","",$str); //過濾html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( 

 清除空格，換行

function DeleteHtml($str)
{
$str = trim($str);
$str = strip_tags($str,"");
$str = ereg_replace("\t","",$str);
$str = ereg_replace("\r\n","",$str);
$str = ereg_replace("\r","",$str);
$str = ereg_replace("\n","",$str);
$str = ereg_replace(" "," ",$str);
return trim($str);
}

 過濾HTML屬性

1，過濾全部html標籤的正則表達式：

</?[^>]+>

//過濾全部html標籤的屬性的正則表達式：

$html = preg_replace("/<([a-zA-Z]+)[^>]*>/","<\\1>",$html);

3，過濾部分html標籤的正則表達式的排除式（好比排除<p>，即不過濾<p>）：

</?[^pP/>]+>

4，過濾部分html標籤的正則表達式的枚舉式（好比須要過濾<a><p><b>等）：

</?[aApPbB][^>]*>

5，過濾部分html標籤的屬性的正則表達式的排除式（好比排除alt屬性，即不過濾alt屬性）：

\s(?!alt)[a-zA-Z]+=[^\s]*

6，過濾部分html標籤的屬性的正則表達式的枚舉式（好比alt屬性）：

(\s)alt=[^\s]*