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$url = parse_url($_SERVER['HTTP_REFERER']);
 
if($_GET['lang'] == 'en') {
    $url = 'Location: http://'.$url['host'].'/en'.$url['path'];
    header($url);
} 
if($_GET['lang'] == 'az') {
    $url = 'Location: http://'.$url['host'].$url['path'];
    $url = str_replace('en/', '', $url);
    header($url);
}