Can't disable dns-prefetch to s.w.org

[superpoincare]

According to the ticket #34292, dns-prefetch to s.w.org can be disabled with the following code (modified with the actual function):

function trac34292_example_resource_hints( $hints, $relation_type ) {
    if ( 'dns-prefetch' === $relation_type ) {
        return array_diff( $hints, wp_dependencies_unique_hosts() );
    }

    return $hints;
}
 
add_filter( 'wp_resource_hints', 'trac34292_example_resource_hints', 10, 2 );

However this doesn't work. I still see the dns-prefetch in HTML.

[swissspidy]

Hey there,

This code snippet I shared on #34292 was for removing resource hints for scripts and styles, not the s.w.org domain. That's why it doesn't work.

return array_diff( $hints, wp_dependencies_unique_hosts() ); means "keep all but scripts & styles".

Instead, you'd want array_diff( wp_dependencies_unique_hosts(), $hints ), i.e. "keep scripts & styles but nothing else.

[creativeslice]

To remove the s.w.org dns prefix you'll need to do this:

add_filter( 'emoji_svg_url', '__return_false' );

[swissspidy]

@creativeslice That will disable more stuff than just resource hints. I really recommend using the approach I mentioned above for this use case.