PHP 프로그래밍에서 일반적인 CodeIgniter 프레임워크 작업은 무엇입니까?

Class My_Controller extends CI_Controller {
  //控制器构造器，此函数会在控制器实例化前自动调用
  function __construct()
  {
    parent::__construct();
    $this->load->model('user_model');
    $this->load->helper('url');
    $this->load->library('session');
  }
}

Class My_Controller extends CI_Controller {
  function index()
  {
    $data['users'] = $this->user_model->all_users();
    $this->load->view('user_list', $data);
  }

  function add()
  {
    // 处理添加用户的逻辑
  }

   function delete()
  {
    // 处理删除用户的逻辑
  }
}

class My_Controller extends CI_Controller {
  function disp_users()
  {
    $data['users'] = $this->user_model->all_users();
    $this->load->view('header');
    $this->load->view('user_list', $data);
    $this->load->view('footer');
  }
}

class User_model extends CI_Model {
  function all_users()
  {
    $query = $this->db->query('SELECT * FROM users');
    return $query->result_array();
  }

  function add_user($data)
  {
    $this->db->insert('users', $data);
  }

  function delete_user($id)
  {
    $this->db->where('id', $id);
    $this->db->delete('users');
  }
}

  function date_to_string($date, $format='Y-m-d')
  {
    $d = DateTime::createFromFormat('Y-m-d', $date);
    return $d->format($format);
  }

$route['默认 URL'] = 'Controller/Method';
$route['users/(:num)'] = 'user/view/$1';
$route['api/(:any)'] = 'api/$1';

class User_model extends CI_Model {
  function add_user($data)
  {
    $this->load->library('form_validation');

    $this->form_validation->set_rules('username', 'Username', 'required');
    $this->form_validation->set_rules('email', 'Email', 'required|valid_email');
    $this->form_validation->set_rules('password', 'Password', 'required|matches[password_confirm]');

    if ($this->form_validation->run() == FALSE)
    {
      echo validation_errors();
    }
    else
    {
      $this->db->insert('users', $data);
    }
  }
}