PHP正则过滤HTML标签、空格、换行符

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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('aabb)

清除空格,换行 
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);}

过滤HTML属性

1、过滤所有html标签的正则表达式:
 
</?[^>]+>
 
2、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>):

</?[^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):

</?[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):

\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):

(\s)alt=[^\s]*  
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