require_wp_db example

        define( 'DB_NAME', $dbname );
        define( 'DB_USER', $uname );
        define( 'DB_PASSWORD', $pwd );
        define( 'DB_HOST', $dbhost );
        /**#@-*/

        // Re-construct $wpdb with these new values.         unset( $wpdb );
        require_wp_db();

        /* * The wpdb constructor bails when WP_SETUP_CONFIG is set, so we must * fire this manually. We'll fail here if the values are no good. */
        $wpdb->db_connect();

        if ( ! empty( $wpdb->error ) ) {
            wp_die( $wpdb->error->get_error_message() . $tryagain_link );
        }

        

require ABSPATH . WPINC . '/class-wp-matchesmapregex.php';
require ABSPATH . WPINC . '/class-wp.php';
require ABSPATH . WPINC . '/class-wp-error.php';
require ABSPATH . WPINC . '/pomo/mo.php';

/** * @global wpdb $wpdb WordPress database abstraction object. * @since 0.71 */
global $wpdb;
// Include the wpdb class and, if present, a db.php database drop-in. require_wp_db();

// Set the database table prefix and the format specifiers for database table columns. $GLOBALS['table_prefix'] = $table_prefix;
wp_set_wpdb_vars();

// Start the WordPress object cache, or an external object cache if the drop-in is present. wp_start_object_cache();

// Attach the default filters. require ABSPATH . WPINC . '/default-filters.php';