PHP實現過濾各種HTML標簽

2024-05-04 23:35:20

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在做項目的過程中，我們經常需要用到過濾一些html標簽來實現提高數據的安全性，其實就是刪除那些對應用程序有潛在危害的數據。它用于去除標簽以及刪除或編碼不需要的字符。

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<__("<"號后面帶空格)

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

}