codeigniter

composer create-project codeigniter4/appstarter project-root
This is default database :

$db['default'] = array(
    ....
  	....
    'database' => 'mydatabase',
    ....
);
Add another database at the bottom of database.php file

$db['second'] = array(
    ....
  	....
    'database' => 'mysecond',
    ....
);

In autoload.php config file

$autoload['libraries'] = array('database', 'email', 'session');

The default database is worked fine by autoload the database library but second database load and connect by using constructor in model and controller...

<?php
    class Seconddb_model extends CI_Model {
        function __construct(){
            parent::__construct();
            //load our second db and put in $db2
            $this->db2 = $this->load->database('second', TRUE);
        }

        public function getsecondUsers(){
            $query = $this->db2->get('members');
            return $query->result(); 
        }

    }
?>composer create-project codeigniter4/appstarter --no-dev
<h2><?php echo $title; ?></h2>

<?php echo validation_errors(); ?>

<?php echo form_open('news/create'); ?>

    <label for="title">Title</label>
    <input type="text" name="title" /><br />

    <label for="text">Text</label>
    <textarea name="text"></textarea><br />

    <input type="submit" name="submit" value="Create news item" />

</form>
composer update
composer create-project codeigniter4/appstarter project-root