<?php

class Database extends CI_Controller {

    public $branch_db;

    function __construct($company_name, $branch_name) {

        parent::__construct();

        $branch_db = $this->load->database($company_name.'_db_'.$branch_name);
    }
}
?>

protected function verifyLogin($username, $password) {

        $this->db->trans_start();

        $sql = "SELECT password, company_id, branch_id
                FROM account
                WHERE username = {$username}"; //Prepare statement

        $query = $this->db->query($sql);
        $result_num = $query->num_rows();

        if ($result_num == 1) {
            $first_row = $query->row();
            $stored_password = $first_row->password;

            if (password_verify($password, $stored_password)) {
                //Successful login
                //Get company name
                //Get branch name
                //Set database
                //Pass company_name, branch_name
                //All models must be able to access the dynamically loaded database
            }

        }

        $this->db->trans_complete();

    }