PHP实现过滤各种HTML标签_php技巧

$str=preg_replace("/<s*imgs+[^>]*&#63;srcs*=s*('|")(.*&#63;)\1[^>]*&#63;/&#63;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)

$str=preg_replace("/<!--.*&#63;-->/si","",$str); //注释

$str=preg_replace("/<(!.*&#63;)>/si","",$str); //过滤DOCTYPE

$str=preg_replace("/<(/&#63;html.*&#63;)>/si","",$str); //过滤html标签

$str=preg_replace("/<(/&#63;head.*&#63;)>/si","",$str); //过滤head标签

$str=preg_replace("/<(/&#63;meta.*&#63;)>/si","",$str); //过滤meta标签

$str=preg_replace("/<(/&#63;body.*&#63;)>/si","",$str); //过滤body标签

$str=preg_replace("/<(/&#63;link.*&#63;)>/si","",$str); //过滤link标签

$str=preg_replace("/<(/&#63;form.*&#63;)>/si","",$str); //过滤form标签

$str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签

$str=preg_replace("/<(applet.*&#63;)>(.*&#63;)<(/applet.*&#63;)>/si","",$str); //过滤applet标签

$str=preg_replace("/<(/&#63;applet.*&#63;)>/si","",$str); //过滤applet标签

$str=preg_replace("/<(style.*&#63;)>(.*&#63;)<(/style.*&#63;)>/si","",$str); //过滤style标签

$str=preg_replace("/<(/&#63;style.*&#63;)>/si","",$str); //过滤style标签

$str=preg_replace("/<(title.*&#63;)>(.*&#63;)<(/title.*&#63;)>/si","",$str); //过滤title标签

$str=preg_replace("/<(/&#63;title.*&#63;)>/si","",$str); //过滤title标签

$str=preg_replace("/<(object.*&#63;)>(.*&#63;)<(/object.*&#63;)>/si","",$str); //过滤object标签

$str=preg_replace("/<(/&#63;objec.*&#63;)>/si","",$str); //过滤object标签

$str=preg_replace("/<(noframes.*&#63;)>(.*&#63;)<(/noframes.*&#63;)>/si","",$str); //过滤noframes标签

$str=preg_replace("/<(/&#63;noframes.*&#63;)>/si","",$str); //过滤noframes标签

$str=preg_replace("/<(i&#63;frame.*&#63;)>(.*&#63;)<(/i&#63;frame.*&#63;)>/si","",$str); //过滤frame标签

$str=preg_replace("/<(/&#63;i&#63;frame.*&#63;)>/si","",$str); //过滤frame标签

$str=preg_replace("/<(script.*&#63;)>(.*&#63;)<(/script.*&#63;)>/si","",$str); //过滤script标签

$str=preg_replace("/<(/&#63;script.*&#63;)>/si","",$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

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;
}

function clear_html_label($html) 
{ 
$search = array ("'<script[^>]*&#63;>.*&#63;</script>'si", "'<[/!]*&#63;[^<>]*&#63;>'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); 
}