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If what you want is a dropdown that shows values in the language you're using here is some sample code:

PHP Code:

<?php

$options = [
    'en'  => lang('Choice.en'),
    'es'    => lang('Choice.es'),
];

echo form_dropdown('language', $options); 


Then in your app/Languages you would create subdirectories for each of your languages let's say your supportedLocales was en, es. You would then create a file called Language.php in each directory.

In app/Languages/en/Language.php

PHP Code:

<?php
return [
    'en' => 'English',
    'es' => 'Spanish',
]; 


In app/Languages/es/Language.php

PHP Code:

<?php
return [
    'en' => 'Ingles',
    'es' => 'Español',
]; 


CodeIgniter takes care of determining the language you want displayed (based on user's browser settings) and substitutes accordingly.

Then you submit/validate however you feel appropriate, push into your session, and your code in your BaseController's initController method for setting the language becomes:

PHP Code:

public function initController(RequestInterface $request, ResponseInterface $response, LoggerInterface $logger)
    {
        $request->setLocale(session('language'));
        // Do Not Edit This Line
        parent::initController($request, $response, $logger);

        // Preload any models, libraries, etc, here.

        // E.g.: $this->session = service('session');
    } 


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