php function code for filtering html tags

This article provides four function codes for filtering html tags. The first method is the simplest to use PHP's own function strip_tags to filter all html tags. The second method uses regular expressions to filter html tags. The third method is to clear HTML tags. User-defined function, based on the ascii encoding value to determine whether it is a letter and then filter.

The most direct way to filter html, the code is as follows:

strip_tags();

Method 2 uses regular filtering, the code is as follows:

function _filter ( $string ) {

return str_replace(array(" "," "," ",' '),array('
','
','
','  '),strip_tags($string,'

'));

}

Regular 2, the code is as follows: preg_replace('/(< br>){1,}/is','
', $str);

Regular 3, the code is as follows:

function delhtml($str){ //Clear html tag

$st=- 1; //Start

$et=-1; //End

$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;

}

//

$str='

www.phpfensi.com

';

$reg = '/(|)|<.+?>/i';

echo preg_replace($reg,'$1',$str);

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