php过滤所有HTML标记

function text2html($txt){

$txt = str_replace(" ","　",$txt);

$txt = str_replace("<","&lt;",$txt);

$txt = str_replace(">","&gt;",$txt);

$txt = preg_replace("/[ ]{1,}/isu","<br/> ",$txt);

return $txt;

}

清除html标记,代码如下:

function clearhtml($str){

$str = str_replace('<','&lt;',$str);

$str = str_replace('>','&gt;',$str);

return $str;

}//开源软件:phpfensi.com