How to re-create a URL with Accept-Language + split ?

Question

I have a code on PHP created by @Maia, it informs the browser language and returns with a redirecting.

Code

<?php
$lang = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
header("Location: http://meusite.com/$lang" ) ;
?>

It redirects to:

meusite.com/pt-BR,pt;q=0.8,en-US;q=0.6,en;q=0.4

The right thing would be for him to redirect to meusite.com/pt-BR because my browser has the language pt-BR.

Did creating a split would solve?

---

Member @Maia did so:

$lang = split(",", $_SERVER['HTTP_ACCEPT_LANGUAGE'])[0];

In case the URL would only go to the first comma, leaving so only: meusite.com/pt-BR. Only the code seems to be wrong, it doesn’t work.

I would like to do this with the URL, leaving up /pt-BR, or even leave it:

meusite.com/pt

The member suggested that I change the index from [0] to 1 leaving so:

$lang = split(",", $_SERVER['HTTP_ACCEPT_LANGUAGE'])[1];

It just doesn’t work, so I’d like some example of how to get it redirected to /en or how to redirect to /pt

Answer 1

Follows a quick fix ¹:

<?php

$langs = array();
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {

   // Cá entre nós, usar regex pra isso é forçar a amizade, mas lá vai :)
   preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse);

   //Aqui vamos ordenar por preferência do usuário
   if (count($lang_parse[1])) {
      $langs = array_combine($lang_parse[1], $lang_parse[4]);
      foreach ($langs as $lang => $val) {
         if ($val === '') $langs[$lang] = 1;
      }
      arsort($langs, SORT_NUMERIC);
   }
}

// Aqui você põe apenas as linguagens que seu site REALMENTE tem:
foreach ($langs as $lang => $val) {
   if ( strpos($lang, 'pt') === 0) {
      header( "Location: http://meusite.com/pt/" ) ;
      exit();
   } else if (strpos($lang, 'en') === 0) {
      header( "Location: http://meusite.com/en/" ) ;
      exit();
   } 
}
// Se nao achar nenhuma:
header( "Location: http://meusite.com/pt/" ) ;
exit();

?>

No need to put pt-BR, nor en-US, unless you want to separate for example the pt-BR of pt-PT, and so on.

_{1. searched in Duck Duck Go, running.}

_{Source:http://www.thefutureoftheweb.com/blog/use-accept-language-header}