打开附件详细页时跳转到首页

function redirect_attachment_page()
{
    if (is_attachment()) {
        global $post;
        if ($post && $post->post_parent) {
            wp_redirect(esc_url(get_permalink($post->post_parent)), 301);
            exit;
        } else {
            wp_redirect(esc_url(home_url('/')), 301);
            exit;
        }
    }
}
add_action('template_redirect', 'redirect_attachment_page');