PHP实现过滤各种HTML标签_php技巧

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

$str=preg_replace("//si","",$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

$str=preg_replace("/(.*?)/si","",$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

$str=preg_replace("/(.*?)/si","",$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")==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); 
}

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。