define('BSG_API_DB_HOST', 'localhost');
define('BSG_API_DB_NAME', 'api_db');
define('BSG_API_DB_USER', 'api_db');
define('BSG_API_DB_PASS', '###');
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function wp() in /var/www/vhosts/elitebgs.net/httpdocs/wp-blog-header.php:16
Stack trace:
#0 /var/www/vhosts/elitebgs.net/httpdocs/index.php(17): require()
#1 {main}
  thrown in <b>/var/www/vhosts/elitebgs.net/httpdocs/wp-blog-header.php</b> on line <b>16</b><br />