How to create functions in model in Codeigniter?

 Create functions in the model in Codeigniter

 Delete, Fetch, Insert and Update functions in Codeigniter

<?php 

class Customer_model extends CI_Model {

 

    /**

    * Responsable for auto load the database

    * @return void

    */

    public function __construct()

    {

        $this->load->database();

        $this->load->helper('url');

    }

    /**

    * Get product by his is

    * @param int $product_id 

    * @return array

    */

   

   public function get_login_data()

    {

$this->db->select('*');

$this->db->from('login_form');

$query = $this->db->get();

return $query->result_array(); 

    }

public function login_detail($email,$password)

    {

$this->db->select('*');

$this->db->from('login_form');

$this->db->where('email',$email);

$this->db->where('password',$password);

$query = $this->db->get();

return $query->result_array(); 

    }

public function get_single_user_detail($user_id)

    {

$this->db->select('*');

$this->db->from('login_form');

$this->db->where('ID',$user_id);

$query = $this->db->get();

return $query->result_array(); 

    }

function register_user($name,$phone,$email,$password){

$data = array(

'name' => $name,

'phone' => $phone,

'email ' => $email,

'password ' => $password

);

$this->db->insert('login_form', $data);

}

function delete_user($user_id){

$this -> db -> where('ID', $user_id);

$this -> db -> delete('login_form');

}

function update_user($user_id,$name,$phone,$email,$password){

$data = array(

'name' => $name,

'phone' => $phone,

'email ' => $email,

'password ' => $password

);

$this->db->update('login_form', $data);

$this -> db -> where('ID', $user_id);

}

}