首先分享一些比较常见的

$str=preg_replace("/<s*imgs+[^>]*")(.*?)1[^>]*","", $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) $str=preg_replace("/<!--.*",$str); //注释 $str=preg_replace("/<(!.*",$str); //过滤DOCTYPE $str=preg_replace("/<(/?html.*",$str); //过滤html标签 $str=preg_replace("/<(/?head.*",$str); //过滤head标签 $str=preg_replace("/<(/?meta.*",$str); //过滤meta标签 $str=preg_replace("/<(/?body.*",$str); //过滤body标签 $str=preg_replace("/<(/?link.*",$str); //过滤link标签 $str=preg_replace("/<(/?form.*",$str); //过滤form标签 $str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签 $str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*",$str); //过滤applet标签 $str=preg_replace("/<(/?applet.*",$str); //过滤applet标签 $str=preg_replace("/<(style.*?)>(.*?)<(/style.*",$str); //过滤style标签 $str=preg_replace("/<(/?style.*",$str); //过滤style标签 $str=preg_replace("/<(title.*?)>(.*?)<(/title.*",$str); //过滤title标签 $str=preg_replace("/<(/?title.*",$str); //过滤title标签 $str=preg_replace("/<(object.*?)>(.*?)<(/object.*",$str); //过滤object标签 $str=preg_replace("/<(/?objec.*",$str); //过滤object标签 $str=preg_replace("/<(noframes.*?)>(.*?)<(/noframes.*",$str); //过滤noframes标签 $str=preg_replace("/<(/?noframes.*",$str); //过滤noframes标签 $str=preg_replace("/<(i?frame.*?)>(.*?)<(/i?frame.*",$str); //过滤frame标签 $str=preg_replace("/<(/?i?frame.*",$str); //过滤frame标签 $str=preg_replace("/<(script.*?)>(.*?)<(/script.*",$str); //过滤script标签 $str=preg_replace("/<(/?script.*",$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 $str=preg_replace("/",$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", "'<[/!]*?[^<>]*"'([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", "'"); $replace = array ("", "", "1", """, "&", "<", ">", " ", chr(161), chr(162), chr(163), chr(169), "chr(1)"); return preg_replace($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。