PHP实现过滤各种HTML标签

2020-03-22 18:23:07

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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","&＃",$str); //过滤script标签更简单些的写法：function delhtml($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 $str;}再来一个：function clear_html_label($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", "' '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教程

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