Auto select language based on browser language

I have a site made in 4 languages. I need to select automatically based on browser language (better than country, I imagine). Any idea? Thanks

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PHP Code:

<?php
/**
 * Get browser language, given an array of avalaible languages.
 * 
 * @param  [array]   $available  Avalaible languages for the site
 * @param  [string]  $default    Default language for the site
 * @return [string]              Language code/prefix
 */

if ( ! function_exists('getBrowserLanguage'))
{
    function getBrowserLanguage($available = [], $default = 'en')
    {
        if ( ! empty($_SERVER['HTTP_ACCEPT_LANGUAGE']))
        {
            $langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);

            if (empty($available))
            {
                return substr($lang, 0, 2);
            }

            foreach ($langs as $lang)
            {
                $lang = substr($lang, 0, 2);

                if (in_array($lang, $available))
                {
                    return $lang;
                }
            }
        }
    
        return $default;
    }
} 


Detects the web browsers languages.

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

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well, you can use agent --> accept_lang to check what language is accepted
https://codeigniter.com/user_guide/libra...agent.html