Call file / class from ThirdParty folder

That's the correct way to call it, so you probably don't have it loaded. Read up on autoloading if you'd like the framework to handle it for you:
https://codeigniter4.github.io/userguide...oader.html

For example, if you wanted to use your code above, app/Config/Autoload.php might look like this:

PHP Code:

$psr4 = [
    'Config'      => APPPATH . 'Config',
    APP_NAMESPACE => APPPATH,                // For custom namespace
    'App'         => APPPATH,                // To ensure filters, etc still found,
    'TP\Tools'    => APPPATH . 'ThirdParty/TpTools',
]; 


(You might want to use the classmap instead, depending on what the library looks like.)

Hi MGatner,

sorry for my late reply, thankyou so much for your help,
i try your solution but still not work yet,
and i try using classmap too.. but not work too..

updating my autoload.php 

PHP Code:

        $psr4 = [
            'Config'      => APPPATH . 'Config',
            APP_NAMESPACE => APPPATH,                // For custom namespace
            'App'         => APPPATH,               // To ensure filters, etc still found,
            'TP\Tools' => APPPATH . 'ThirdParty/Foo.php'
        ]; 


Foo.php ( locate at ThirdParty folder) look like this 

PHP Code:

<?php namespace TP\Tools;

/**
 * 
 */
class Foo
{
    public static function check1(){
        echo "string";
    }
}

?>

User controller

PHP Code:

<?php namespace App\Controllers;

use CodeIgniter\Controller;
use App\Models\UserModel;
use TP\Tools;

class User extends BaseController
{
    private $usermodel;

    public function __construct()
    {
        $this->usermodel = new UserModel();
    }

    public function index(){
        Foo::check1();
    }