// Remove media/attachment permalink
if ( !function_exists( 'ff_cleanup_attachment_permalink' ) ) {
	function ff_cleanup_attachment_permalink( $rules ) {
		foreach ( $rules as $regex => $query ) {
			if ( strpos( $regex, 'attachment' ) || strpos( $query, 'attachment' ) ) {
				unset( $rules[ $regex ] );
			}
		}
		return $rules;
	}
	add_filter( 'rewrite_rules_array', 'ff_cleanup_attachment_permalink' );
}

if ( !function_exists( 'ff_cleanup_attachment_link' ) ) {
	function ff_cleanup_attachment_link( $link ) {
		return;
	}
	add_filter( 'attachment_link', 'ff_cleanup_attachment_link' );
}