My function returns same data without do the jobs-CodePudding

I have made function like below to remove html tags and special characters from the string.

function input_filter_data($data) {
        $data= trim($data);
        $data= stripslashes($data);
        $data= htmlspecialchars($data);
        $data= strip_tags($data);
        return $data;
}

and I am trying to use it like below

$affiliate_id =input_filter_data("Hello <b><i>world!</i></b>","<i>");

echo $affiliate_id;

But its giving me same result like

Hello <b><i>world!</i></b>","<i>

But if I use simple like

echo strip_tags("Hello <b><i>world!</i></b>","<i>");

then its removing all html tags from string.

I am not getting idea why its happening like this, let me know if anyone here can help me for solve the puzzle.

Thanks!

CodePudding user response：

It could help to debug what each step of input_filter_data does: after calling htmlspecialchars, the string does not contain any markup, but solely escaped markup. strip_tags won't perform any change on such a input