PHP实现过滤各种HTML标签

首先分享一些比较常见的

PHP;"> $str=preg_replace("/]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i","",$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

更简单些的写法：

PHP;"> 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; }

再来一个：

PHP;"> function clear_html_label($html) { $search = array ("']*?>.*?'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); }

以上三种方法均可以实现，不过各有优劣，小伙伴们根据自己的项目需求来选择吧。

PHP实现过滤各种HTML标签

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