Query Builder Select method using array as fieldnames

The documentation mentions you can select fields like this:

PHP Code:

$this->db->select('user_id, user_name, user_email'); 


What it doesn't mention is that this also seems to work:

PHP Code:

$this->db->select( array('user_id', 'user_name', 'user_email') ); 


This is actually really useful when I have a model method which allows you to select whatever fields you require at the time, i.e:

PHP Code:

public function get_user($user_id, $fields = array('*')) {
    $query = $this->db->select( $fields )
                  ->from('user')
                  ->where( array('user_id' => $user_id) )
                  ->get();

    return $query->row_array();
}

$user = $this->user_model->get_user(1); // Get user with all fields
$user = $this->user_model->get_user(1, array('user_email')); // Get just the user's email address 


My question is, is being able to use $this->db->select() in this way intentional, or just a lucky mistake?

Intentional.

Intentional.

That's great to know, thank you!