Codeigniter 4：使用 BaseController 加载的助手 function 在库中不可用，除非助手也在库中加载

Question

Previously I was using Codeigniter 3 and I load all helpers, libraries using the autoload.php . Now migrating to CI4 where I tried the following,

1. I tried loading my helper files in the BaseController.php
2. I tried loading the helper in __construct at my Controller.php as well.

I have a Library say Demo.php and function check_user_logged() . When I called my get_cookie() from the function, it says Call to undefined function App\Libraries\get_cookie() .

This function check_user_logged() when it is called from a controller as,

<?php
use App\Libraries\Demo;

protected $demo;

public function __construct()
{
    helper('cookie');
    $this->demo = new Demo();
}

public function index()
{
    $this->demo->check_user_logged();
}

The Demo.php

<?php
namespace App\Libraries;
Class Demo
{
   public function check_user_logged()
   {
      print_r(get_cookie('name')); // just for simplicity printing the cookie
   }
}

Is it the only way to load the cookie helper in Demo library constructor? Or I am missing something?

Answer 1

I personally prefer loading a helper in a specific function/class that needs it .

Option 1:

Loading the cookie helper in the library's constructor.

<?php

namespace App\Libraries;
class Demo
{
    public function __construct()
    {
        helper('cookie');
    }

    public function check_user_logged()
    {
        print_r(get_cookie('name')); // just for simplicity printing the cookie
    }
}

Option 2:

Loading the cookie helper in the library's method.

The helper function get_cookie() gets the cookie from the current Request object, not from Response . This function checks the $_COOKIE array if that cookie is set and fetches it right away.

<?php

namespace App\Libraries;
class Demo
{
    public function check_user_logged()
    {
        helper('cookie');

        print_r(get_cookie('name')); // just for simplicity printing the cookie
    }
}

Option 3A:

Getting the cookie in the current Response's cookie collection .

<?php

namespace App\Libraries;
class Demo
{
    public function check_user_logged()
    {
        print_r(\Config\Services::response()->getCookie('name')); // just for simplicity printing the cookie
    }
}

Option 3B:

Using the cookies(...) global function. No need to load any helpers.

Fetches the global CookieStore instance held by Response .

<?php

namespace App\Libraries;
class Demo
{
    public function check_user_logged()
    {
        print_r(cookies()->get('name')); // just for simplicity printing the cookie
    }
}

Answer 2

Loading the generic CI4 cookie helper in the BaseController should work.

protected $helpers = ['cookie','my_security_helper' ];

Can you post your original faulty code?