Issue for loading language in controller

Hi, i would like compile the meta hreflang tag dynamically and navigate the pages like in Joomla.
My site is in italian and english. Default language should be italian. My code:

Config/App.php

PHP Code:

public $defaultLocale = 'it';
public $negotiateLocale = true;
public $supportedLocales = ['it', 'en']; 


Controller Main.php

PHP Code:

<?php namespace App\Controllers\It;
use App\Controllers\BaseController;

class Main extends BaseController
{
public function index()
  {
    $data['title'] = 'My Site';

    $data['ita'] = lang('App.linkNav01', [], 'it'); // FIRST ITALIAN
    $data['eng'] = lang('App.linkNav01', [], 'en'); // AFTER ENGLISH

    echo view('home', $data);
  }
} 


View main.php

PHP Code:

<link rel="alternate" hreflang="it" href="<?php echo base_url($ita);?>" />
<link rel="alternate" hreflang="en" href="<?php echo base_url($eng);?>" /> 


The meta tag are ok but the site (in italian too) is always translate in english. If i change the order in controller like this:

PHP Code:

<?php namespace App\Controllers\It;
use App\Controllers\BaseController;

class Main extends BaseController
{
public function index()
  {
    $data['title'] = 'My Site';

    $data['eng'] = lang('App.linkNav01', [], 'en'); // FIRTS ENGLISH
    $data['ita'] = lang('App.linkNav01', [], 'it'); // AFTER ITALIAN

    echo view('home', $data);
  }
} 


the site is always translate in italian. What happens? Why i have this behavior?

Thanks for help me! 

Because you need to check to see which language should be displayed first
then add it to the data.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

Thanks for reply. Can you explain better please?

You should have a dropdown and allow the user to select the language or get the local setting.

Read this:

CodeIgniter 4 Language Localization

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )