mysqli_insert_id() expects exactly 1 parameter, 0 given in CodeIgniter - php

Question

I have a problem, Please Help me. I'm using Code igniter
This is my code.
my Models (M_register.php)
class M_register extends CI_Model {
function __construct()
{
parent::__construct();
}
function add_account($data)
{
$this->load->database();
$this->db->insert('login',$data);
**return mysqli_insert_id();**
}
function changeActiveState($key)
{
$this->load->database();
$data = array(
'active' => 1
);
$this->db->where('md5(id)', $key);
$this->db->update('login', $data);
return true;
}
}
And this is partly code in Controller
$data = array(
'username' => $username,
'password' => $password,
'nama' => $nama,
'email' => $email,
'active' => 0
);
$this->load->model('m_register');
**$id = $this->m_register->add_account($data);**
$encrypted_id = md5($id);
enter code here
And this My error:

Answer 1

The error message is clear :
mysqli_insert_id() expects exactly 1 parameter, 0 given
You must give it the connection in parameter. For example :
$con = mysqli_connect("localhost","my_user","my_password","my_db");
mysqli_query($con,"INSERT INTO Persons (FirstName,LastName,Age) VALUES ('Glenn','Quagmire',33)");
// Here the call to "mysqli_insert_id" takes the output of "mysqli_connect" as parameter
echo "New record has id: " . mysqli_insert_id($con);
mysqli_close($con);
Source: https://www.w3schools.com/php/func_mysqli_insert_id.asp
I don't know in your code where you're doing the connection, but check that your call to $this->load->database() doesn't return the connection resource.

Answer 2

Pass the database connection variable as parameter
$query = $this->db->insert('login',$data);
return mysqli_insert_id($dbconnection);

Answer 3

You are using codeigniter, so it would be better if you use codeigniter functions only to perform database operation.
Definitely you will get result using mysqli_insert_id(db_connection_object)
But it would be better if you use inbuilt function of codeigniter
$this->db->insert_id();