WordPress: Connect To Two Databases

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Sometimes you need to connect to two databases in WordPress. Maybe it's a remote database, a slave database, or two instances of WordPress so that you can manipulate data between them.
The first (current, local) database is already available to you in variable $wpdb. You can assign it a variable, if you'd like.
The second database connection can be created using the wpdb class. Simply do:
$db2 = new wpdb('db_user', 'db_user_pass', 'db_name', 'db_host')