Connect wordpress to WordPress to different severs DB

[ Moved to the Fixing WordPress sub-forum. ]

Hi i have a question i am trying to connect few wordpress database together so i can use functions like get_results, get_user etc but my problem is my i can’t use wordpress multisite because it’s on different severs, i did some research and i found the only and simple way is via $wpdb classes in wp-includes/wp-db.php like this
===============================================================================
$mydb = new wpdb('username','password','database','localhost');
$rows = $mydb->get_results("select Name from my_table");
echo "

";
foreach ($rows as $obj) :
echo "
• ".$obj->Name."

";
endforeach;
echo "

";
———————-OR———————————-

/**
* Instantiate the wpdb class to connect to your second database, $database_name
*/
$second_db = new wpdb(DB_USER, DB_PASSWORD, $database_name, DB_HOST);
/**
* Use the new database object just like you would use $wpdb
*/
$results = $second_db->get_results($your_query);

———————————————————-
but i don’t know how i am little new at editing WP files ,can anyone help me please
here the answer i found so far.
https://wordpress.stackexchange.com/questions/1604/using-wpdb-to-connect-to-a-separate-database

https://wordpress.stackexchange.com/questions/181468/how-to-connect-remote-database-in-wordpress