Question

I am wanting to have the EXACT same data across two WordPress sites that are on different domains e.g. blog.company.com and blog.business.com BUT are on the same server etc. Each have their own theme but share the same data. So if I post on one the other has also has that post.

Is this possible? It’s a client request, so please bear with the idea

Answer 1

I would setup 1 database for both sites. @Wyck has a concern about links stored in the database, which is valid, but a quick header.php and functions.php modification can fix that for you.

To setup the sites to use the same data, configure the wp-config.php file to use the same database information for both.

WP-CONFIG

<?php 
define('DB_NAME', 'db_name');
define('DB_USER', 'db_user');
define('DB_PASSWORD', 'db_password');

// I'm not sure if you'll need a condition or not. If your database host URL is the same or not.

$site1 = ( $_SERVER['HTTP_HOST'] != 'site1.company.com' );

if ( $site1 ) {
    // site1
    define('DB_HOST', 'external-db.company.com');

} else {
    // site2
    define('DB_HOST', 'internal-db.company.com');
    // define('DB_HOST', 'localhost');

}
?>

Header

<?php ob_start('fix_links'); ?>

Functions

<?php 
function fix_links($input) {
    // create absolute URL fixes for both domains - this only fixes the current domain. You might have to modify it being that it seems based on the subdomain as well. 
    return preg_replace('!http(s)?://(www.)?' . $_SERVER['SERVER_NAME'] . '/!', '/', $input);
}
?>