WordPress snippet: Remove default DNS prefetch for s.w.org

functions.php

<?php
add_filter(
    'wp_resource_hints',
    function( $hints, $relation_type ) {
        foreach( $hints as $k => $v ) {
            if ( strpos( $v, '//s.w.org/' ) ) {
                unset( $hints[$k] );
            }
        }
        return $hints;
    },
    10,
    2
);