我不能说我会建议在高负载系统上使用它，如果这些系统应该在HTAccess中使用301\'d或有自己的自定义表来关联的话。下面是一个解决方案，它将获取请求的URL并尝试查找具有匹配元的帖子：

/**
 * Redirect 404s based on requested url
 *
 * @return void
 */
function wpse_226378() {
    global $wp;

    if( is_404() ) {
        $current_url = add_query_arg( $_REQUEST,$wp->request );     // Get current requested URL ( minus the domain )
        $page = get_posts( array(                                   // Get a single post that has that URL as a post meta
            \'post_type\'         => \'page\',
            \'posts_page_page\'   => 1,
            \'meta_key\'          => \'old_url\',
            \'meta_value\'        => sanitize_text_field( $current_url ),
            \'fields\'            => \'ids\',
        ) );

        if( ! empty( $page ) ) {                                    // IF it\'s found
            wp_safe_redirect( get_permalink( $page[0] ), 301 );     // 301 redirect it
            exit;                                                   // Exit script entirely
        }
    }
}
add_action( \'template_redirect\', \'wpse_226378\' );