Question

Please help me with php file that must redirect to correct language.
the site architecture is
site.com/en
site.com/fr

my cod:

<?php
$sites = array(
"en" => "/en/index",
);

$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);

if (!in_array($lang, array_keys($sites))){
$lang = 'en';
}
// перенаправление на субдомен
header('Location: ' . $sites[$lang]);
?>

Answer 1

You could to append the $_SERVER['PHP_SELF'] variable, that contains the path relative to the document root, to your language folder.

If your path were site.com/fr/file, this variable would contain /fr/file. When you remove the first part of this part, you get the ‘language-independent’ path of the called script, that you can append to the desired language directory.

If your path is as you described, you could try the following solution (untested!):

<?php
$sites = array(
"en" => "/en",
);

$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);

if (!in_array($lang, array_keys($sites))){
$lang = 'en';
}

$path_to_script = substr($_SERVER['PHP_SELF'], 3);

header('Location: ' . $sites[$lang] . $path_to_script);
?>

EDIT: to clarify the approach:
If the site is site.com/fr/123/index.php, the variable $path_to_script will then contain /123/index.php, the script directory without the leading language dir.
You can then append this to the desired language dir and get the path you wanted: /en/123/index.php