phpはHTMLタグコードを削除します

function Text2Html($txt){
        $txt = str_replace("  ","　",$txt);
        $txt = str_replace("<","<",$txt);
        $txt = str_replace(">",">",$txt);
        $txt = preg_replace("/[rn]{1,}/isU","
rn",$txt);
        return $txt;
}

?>

php, html