[WordPress]wp_head()のlink rel=”dns-prefetch”を削除

functions.php

add_filter( 'wp_resource_hints', 'remove_dns_prefetch', 10, 2 );
function remove_dns_prefetch( $hints, $relation_type ) {
	if ( 'dns-prefetch' === $relation_type ) {
		return array_diff( wp_dependencies_unique_hosts(), $hints );
	}
	return $hints;
}