WordPress Multisite With Top Level Domain Names (TLDs)

.htaccess

# BoF WordPress

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ wp/$1 [L]
RewriteRule . index.php [L]

# EoF WordPress

wp-config.php

<?php
/**
 * The base configuration for WordPress
 *
 * The wp-config.php creation script uses this file during the
 * installation. You don't have to use the web site, you can
 * copy this file to "wp-config.php" and fill in the values.
 *
 * This file contains the following configurations:
 *
 * * MySQL settings
 * * Secret keys
 * * Database table prefix
 * * ABSPATH
 *
 * @link https://codex.wordpress.org/Editing_wp-config.php
 *
 * @package WordPress
 */

// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define('DB_NAME', 'hello_world');

/** MySQL database username */
define('DB_USER', 'root');

/** MySQL database password */
define('DB_PASSWORD', '_password_');

/** MySQL hostname */
define('DB_HOST', 'localhost');

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8mb4');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

/**#@+
 * Authentication Unique Keys and Salts.
 *
 * Change these to different unique phrases!
 * You can generate these using the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
 * You can change these at any point in time to invalidate all existing cookies. This will force all users to have to log in again.
 *
 * @since 2.6.0
 */
define('AUTH_KEY',         'zq0`;~pZ#Mh w`#CM.VAG_(i4#l(XsmfBO*m{)@UP%1:ms1oq;^Wun!g;g0avP.^');
define('SECURE_AUTH_KEY',  ',m8 lzNQC~_jCHZ=DY`wz761Y3QH;9-.e#eY+cASpa=qFv]VP,ZP*KSPZ@myRgJ-');
define('LOGGED_IN_KEY',    'vf8Y@,%;.Sg*F;bs8v|;h8>Sy{E4iI%0XMet~Thtmf7]Ef_JyfKn|zS0_O|H]lbP');
define('NONCE_KEY',        'Y>HW4x*p[:$Rjk.F=?s$DU!mPn*Es#f{d8/M<8:$ B`N&:QCOX,%b-){[-sv2XD?');
define('AUTH_SALT',        '#5voQEe7(j=yp$hYk5T;a(19;w M8D2L,cb4Yl)Ucu3QjeqWoA,$.yeO5BwRQ{bG');
define('SECURE_AUTH_SALT', '|RN5?QJm^yYh9=?1-eR6N0hce+P,]{.3?Pcq7,]x7nZe:n Y!osF^8FfcZ$}&l?~');
define('LOGGED_IN_SALT',   '%y8~US]Kt9Dx2x6 i6bo~6R@0v9wIXB+Xe<AD;$en83*,<EJ}3SHby8i[S?L%#d ');
define('NONCE_SALT',       'HcvG},aSZ%tGs59db@0N3:V9ca{1.+qTZH#q`^(x*?yOyfz(nubji].h&A}f}Lzz');

/**#@-*/

/**
 * WordPress Database Table prefix.
 *
 * You can have multiple installations in one database if you give each
 * a unique prefix. Only numbers, letters, and underscores please!
 */
$table_prefix  = 'wp_';

/**
 * For developers: WordPress debugging mode.
 *
 * Change this to true to enable the display of notices during development.
 * It is strongly recommended that plugin and theme developers use WP_DEBUG
 * in their development environments.
 *
 * For information on other constants that can be used for debugging,
 * visit the Codex.
 *
 * @link https://codex.wordpress.org/Debugging_in_WordPress
 */
define('WP_DEBUG', false);

/* That's all, stop editing! Happy blogging. */

/* Multisite */
define( 'WP_ALLOW_MULTISITE', true );

define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'primarydomain.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

define( 'COOKIE_DOMAIN', '' );
define( 'ADMIN_COOKIE_PATH', '/' );
define( 'COOKIEPATH', '/' );
define( 'SITECOOKIEPATH', '/' );


/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');