在做项目的过程中，我们经常需要用到过滤一些html标签来实现提高数据的安全性，其实就是删除那些对应用程序有潜在危害的数据。它用于去除标签以及删除或编码不需要的字符。
首先分享一些比较常见的
$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 $str=preg_replace("/$str); //过滤<__ style="color: #000000">号后面带空格) $str=preg_replace("//si","",$str); //注释 $str=preg_replace("//si","",$str); //过滤DOCTYPE $str=preg_replace("//si","",$str); //过滤html标签 $str=preg_replace("//si","",$str); //过滤head标签 $str=preg_replace("//si","",$str); //过滤meta标签 $str=preg_replace("//si","",$str); //过滤body标签 $str=preg_replace("//si","",$str); //过滤link标签 $str=preg_replace("//si","",$str); //过滤form标签 $str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签 // http://www.manongjc.com/article/1345.html $str=preg_replace("/(.*?)/si","",$str); //过滤applet标签 $str=preg_replace("//si","",$str); //过滤applet标签 $str=preg_replace("/(.*?)/si","",$str); //过滤style标签 $str=preg_replace("//si","",$str); //过滤style标签 $str=preg_replace("/(.*?)/si","",$str); //过滤title标签 $str=preg_replace("//si","",$str); //过滤title标签 $str=preg_replace("/object.*?)>(.*?)object.*?)>/si","",$str); //过滤object标签 $str=preg_replace("//si","",$str); //过滤object标签 $str=preg_replace("/(.*?)/si","",$str); //过滤noframes标签 $str=preg_replace("//si","",$str); //过滤noframes标签 $str=preg_replace("/(.*?)/si","",$str); //过滤frame标签 $str=preg_replace("//si","",$str); //过滤frame标签 $str=preg_replace("/(.*?)/si","",$str); //过滤script标签 $str=preg_replace("//si","",$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(" $st=$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 ("''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); }
