PHP实现过滤各种HTML标签

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$str=preg_replace("/<s*imgs+[^>]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i","", $str); //过滤img标签

$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

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function delhtml($str){ //清除html标签

$st=-1; //开始

$et=-1; //结束

$stmp=array();

$stmp[]=" ";

$len=strlen($str);

for($i=0;$i<$len;$i++){

$ss=substr($str,$i,1);

if(ord($ss)==60){ //ord("<")==60

$st=$i;

}

if(ord($ss)==62){ //ord(">")==62

$et=$i;

if($st!=-1){

$stmp[]=substr($str,$st,$et-$st+1);

}

}

}

$str=str_replace($stmp,"",$str);

return $str;

}

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function clear_html_label($html)

{

$search = array ("'<script[^>]*?>.*?</script>'si", "'<[/!]*?[^<>]*?>'si", "'([rn])[s]+'", "'&(quot|#34);'i", "'&(amp|#38);'i", "'&(lt|#60);'i", "'&(gt|#62);'i", "'&(nbsp|#160);'i", "'&(iexcl|#161);'i", "'&(cent|#162);'i", "'&(pound|#163);'i", "'&(copy|#169);'i", "'&#(d+);'e");

$replace = array ("", "", "1", """, "&", "<", ">", " ", chr(161), chr(162), chr(163), chr(169), "chr(1)");

return preg_replace($search, $replace, $html);

}