Changing attachment urls?

How can I change the format of attachment page urls from /[post-url]/[attachment-name]/ to /media/[attachment-name]/? I understand that I can override the output of get_attachment_link via the attachment_link filter, but I guess I need to change the redirect structure so WordPress knows how to handle these urls?

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  1. You can do the following:

    /* add new rewrite rule */
    function attachment_rewrite( $wp_rewrite ) {
        $rule = array(
            'media/(.+)' => 'index.php?attachment=' . $wp_rewrite->preg_index(1)
        );
    
        $wp_rewrite->rules = $rule + $wp_rewrite->rules;
    }
    add_filter( 'generate_rewrite_rules', 'attachment_rewrite' );
    
    /* redirect standard wordpress attachments urls to new format */
    function redirect_old_attachment() {
        global $wp;
    
        if( !preg_match( '/^media/(.*)/', $wp->request ) && isset( $wp->query_vars['attachment'] ) ) {
            wp_redirect( site_url( '/media/' . $wp->query_vars['attachment'] ) , 301 );
        }
    }
    add_filter( 'template_redirect', 'redirect_old_attachment' );