WP / inc / wpdb / db.inc.php

<?php

class DBConn implements IDBConn {

   //----------------------------------
   public function connect() {
   }

   //----------------------------------
   public function set($DB_HOST, $DB_USER, $DB_PASSWORD, $DB_NAME) {
   }

   //----------------------------------
   public function get() {

       global $wpdb;
       $wpdb->show_errors();
       return $wpdb;
   }
}

?>