PHP实现过滤各种HTML标签

首先分享一些比较常见的

  $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    $str=preg_replace("/on([a-z]+)s*=/si","On1=",$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", "'&#(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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