WordPress Multisite Local/Staging/Live Dev Setup

sunrise.php

<?php
/**
 * File wp-content/sunrise.php
 *
 * This allows us to copy the production multisite database to staging/local and still use 
 * it directly without altering domains
 *
 * This file can be present on all copies of the site, but it should only be added to the
 * wp-config file of local/staging (via `define( 'SUNRISE', true )`)
 *
 * @author Cory Hughart <cory@coryhughart.com>
 */

/**
 * Filter /wp-includes/ms-load.php::get_site_by_path()
 * and /wp-includes/class-wp-network.php::get_by_path()
 **/
function dev_get_site_by_path( $_site, $_domain, $_path, $_segments, $_paths ) {
	global $wpdb, $path;

	// Get our actual domain in the database (should be set to production domain)
	// The domain coming in should be the request domain
	$domain = str_replace( WP_DEV_TLD, WP_PROD_TLD, $_domain);

	// Search for a site matching the domain and first path segment
	$site = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE domain = %s and path = %s", $domain, $_paths[0] ) );
	$current_path = $_paths[0];

	if ($site === null) {
	// Specifically for the main blog - if a site is not found then load the main blog
		$site = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE domain = %s and path = %s", $domain, '/' ) );
		$current_path = '/';
	}

	// Set path to match the first segment
	$path = $current_path;

	return $site;
}
add_filter( 'pre_get_site_by_path', 'dev_get_site_by_path', 1, 5 );
add_filter( 'pre_get_network_by_path', 'dev_get_site_by_path', 1, 5 );

/**
 * Filter the site_url and home options for each site, and
 * filter /wp-includes/link-template.php::network_site_url()
 * and /wp-includes/link-template.php::network_home_url()
 * so that our network site link is correct in the admin menu
 */
function dev_network_url( $_url = '' ) {
	return str_replace( WP_PROD_TLD, WP_DEV_TLD, $_url );
}
add_filter( 'network_site_url', 'dev_network_url' );
add_filter( 'network_home_url', 'dev_network_url' );
add_filter( 'option_siteurl', 'dev_network_url' );
add_filter( 'option_home', 'dev_network_url' );

wp-config-live.php

<?php
/**
 * Excerpt fron LIVE wp-config
 */

// ...

define('WP_DEBUG', false);

/** Set this to your LIVE tld setup */
define( 'WP_HOME', 'https://mysite.com');
define( 'WP_SITEURL', 'https://mysite.com');

/** Do NOT include wp-content/sunrise.php */
// define( 'SUNRISE', false );
/** This should be the TLD in the database */
// define( 'WP_PROD_TLD', '.com' );
/** This should be the tld of this server */
// define( 'WP_DEV_TLD', '.stagingsite.com');

/** Multisite config */
define( 'WP_ALLOW_MULTISITE', true );
define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true ); // false if sub-folder install
define( 'DOMAIN_CURRENT_SITE', 'mysite.com' ); // LIVE domain
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );
define('COOKIE_DOMAIN', $_SERVER['HTTP_HOST']);
//define('WP_DEFAULT_THEME', 'default'); // apply a theme by default to all newly created sites

// ...

wp-config-local.php

<?php
/**
 * Excerpt fron LOCAL wp-config
 */

// ...

define('WP_DEBUG', true);

/** Set this to your LOCAL tld setup */
define( 'WP_HOME', 'http://mysite.local');
define( 'WP_SITEURL', 'http://mysite.local');

/** Include wp-content/sunrise.php */
define( 'SUNRISE', true );
/** This should be the TLD in the database */
define( 'WP_PROD_TLD', '.com' );
/** This should be the tld of this server */
define( 'WP_DEV_TLD', '.local');

/** Multisite config */
define( 'WP_ALLOW_MULTISITE', true );
define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true ); // false if sub-folder install
define( 'DOMAIN_CURRENT_SITE', 'mysite.com' ); // LIVE domain
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );
define('COOKIE_DOMAIN', $_SERVER['HTTP_HOST']);
//define('WP_DEFAULT_THEME', 'default'); // apply a theme by default to all newly created sites

// ...

wp-config-staging.php

<?php
/**
 * Excerpt fron STAGING wp-config
 */

// ...

define('WP_DEBUG', true);

/** Set this to your STAGING tld setup */
define( 'WP_HOME', 'http://mysite.stagingserver.com');
define( 'WP_SITEURL', 'http://mysite.stagingserver.com');

/** Include wp-content/sunrise.php */
define( 'SUNRISE', true );
/** This should be the TLD in the database */
define( 'WP_PROD_TLD', '.com' );
/** This should be the tld of this server */
define( 'WP_DEV_TLD', '.stagingserver.com');

/** Multisite config */
define( 'WP_ALLOW_MULTISITE', true );
define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true ); // false if sub-folder install
define( 'DOMAIN_CURRENT_SITE', 'mysite.com' ); // LIVE domain
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );
define('COOKIE_DOMAIN', $_SERVER['HTTP_HOST']);
//define('WP_DEFAULT_THEME', 'default'); // apply a theme by default to all newly created sites

// ...