<?php
//inside helpers/Settings.php class
public function db() {
	if ($this->db == null) {
		$server = "localhost";
		$user = "root";
		$pass = "";
		$dbName = "test";
		$this->db = new mysqli($server, $user, $pass, $dbName);
	}
	return $this->db;
}

//at the bottom of helpers/Settings.php file
function db(){
	global $config;
	return $config->db();
}