No index code issue | WordPress.org

Hi

For some reason google is indexing pages with this url ending:

/?pp=1

/feed/

Searching through internet I found similar cases that you helped fixing by using this code:

add_filter( 'rank_math/frontend/robots', function( $robots ) {
	$url = home_url( $_SERVER['REQUEST_URI'] );
	if( (strpos($url,"?pp=") !== false) )  {
		$robots["index"] = 'noindex';
		$robots["follow"] = 'nofollow';
	}
	return $robots;
});

add_action( 'template_redirect', 'noindex_feeds' );
function noindex_feeds() {
    if ( ! is_feed() ) {
        return;
    }
header( 'X-Robots-Tag: noindex', true );

I put this code in a rank-math.php file that I created in my child theme folder. But after saving, it puts all this code at the top of my page. And when I go to wp-admin to login I get a white page and the code at top.

You can see this problem in these screenshots:

https://privatebin.support-tools.com/?05d7ec9548deadbf#wcQ0H8OOS7MPUI9MABJyizoz2PQHVxBurl7VPHbK9ns=

https://privatebin.support-tools.com/?7d56a55baa25eb27#+9BLW7TAK/DxK01MH2HeeLoHw5rWeUvURdDLkDC60cc=

I removed the code for the moment because its affecting negatively my site.

The page I need help with: [log in to see the link]