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$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,如javAsCript:alert( 
清除空格,换行
function DeleteHtml($str){$str = trim($str);$str = strip_tags($str,"");$str = ereg_replace("	","",$str);$str = ereg_replace("
","",$str);$str = ereg_replace("
","",$str);$str = ereg_replace("
","",$str);$str = ereg_replace(" "," ",$str);return trim($str);}
过滤HTML属性
1,过滤所有html标签的正则表达式:
复制代码 代码如下: 
</?[^>]+>
 
//过滤所有html标签的属性的正则表达式:
 
$html = preg_replace("/<([a-zA-Z]+)[^>]*>/","<\1>",$html);

3,过滤部分html标签的正则表达式的排除式(比如排除<p>,即不过滤<p>):
复制代码 代码如下:
</?[^pP/>]+>

4,过滤部分html标签的正则表达式的枚举式(比如需要过滤<a><p><b>等):
复制代码 代码如下:
</?[aApPbB][^>]*>

5,过滤部分html标签的属性的正则表达式的排除式(比如排除alt属性,即不过滤alt属性):
复制代码 代码如下:
s(?!alt)[a-zA-Z]+=[^s]*

6,过滤部分html标签的属性的正则表达式的枚举式(比如alt属性):
复制代码 代码如下:
(s)alt=[^s]*