PHP實現過濾各種HTML標簽

首先分享一些比較常見的

$str=preg_replace("/<s*imgs+[^>]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i","", $str); //過濾img標簽

$str=preg_replace("/s+/","", $str); //過濾多余回車

$str=preg_replace("/<[ ]+/si","<",$str); //過濾<__("<"號後面帶空格)

$str=preg_replace("/<!--.*?-->/si","",$str); //注釋

$str=preg_replace("/<(!.*?)>/si","",$str); //過濾DOCTYPE

$str=preg_replace("/<(/?html.*?)>/si","",$str); //過濾html標簽

$str=preg_replace("/<(/?head.*?)>/si","",$str); //過濾head標簽

$str=preg_replace("/<(/?meta.*?)>/si","",$str); //過濾meta標簽

$str=preg_replace("/<(/?body.*?)>/si","",$str); //過濾body標簽

$str=preg_replace("/<(/?link.*?)>/si","",$str); //過濾link標簽

$str=preg_replace("/<(/?form.*?)>/si","",$str); //過濾form標簽

$str=preg_replace("/cookie/si","COOKIE",$str); //過濾COOKIE標簽

$str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*?)>/si","",$str); //過濾applet標簽

$str=preg_replace("/<(/?applet.*?)>/si","",$str); //過濾applet標簽

$str=preg_replace("/<(style.*?)>(.*?)<(/style.*?)>/si","",$str); //過濾style標簽

$str=preg_replace("/<(/?style.*?)>/si","",$str); //過濾style標簽

$str=preg_replace("/<(title.*?)>(.*?)<(/title.*?)>/si","",$str); //過濾title標簽

$str=preg_replace("/<(/?title.*?)>/si","",$str); //過濾title標簽

$str=preg_replace("/<(object.*?)>(.*?)<(/object.*?)>/si","",$str); //過濾object標簽

$str=preg_replace("/<(/?objec.*?)>/si","",$str); //過濾object標簽

$str=preg_replace("/<(noframes.*?)>(.*?)<(/noframes.*?)>/si","",$str); //過濾noframes標簽

$str=preg_replace("/<(/?noframes.*?)>/si","",$str); //過濾noframes標簽

$str=preg_replace("/<(i?frame.*?)>(.*?)<(/i?frame.*?)>/si","",$str); //過濾frame標簽

$str=preg_replace("/<(/?i?frame.*?)>/si","",$str); //過濾frame標簽

$str=preg_replace("/<(script.*?)>(.*?)<(/script.*?)>/si","",$str); //過濾script標簽

$str=preg_replace("/<(/?script.*?)>/si","",$str); //過濾script標簽

$str=preg_replace("/javascript/si","Javascript",$str); //過濾script標簽

$str=preg_replace("/vbscript/si","Vbscript",$str); //過濾script標簽

$str=preg_replace("/on([a-z]+)s*=/si","On\1=",$str); //過濾script標簽

$str=preg_replace("/&#/si","&＃",$str); //過濾script標簽

更簡單些的寫法：

function delhtml($str){  //清除html標簽
$st=-1; //開始
$et=-1; //結束
$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;
}

再來一個：

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); 
}

以上三種方法均可以實現，不過各有優劣，小伙伴們根據自己的項目需求來選擇吧。