Checking cookie and session value - php

Question

I am working on a multilingual website, and I have a problem now. When the $_GET['setlang'] is empty, language is set to en_US, even if I had ?setlang=pl opened before (which is working fine - language is changing)
empty($_GET['setlang']) ? $_GET['setlang'] = '' : $_GET['setlang'];
switch ($_GET['setlang']) {
case 'en':
$lang = 'en_US';
putenv('LC_ALL='.$lang);
setlocale(LC_ALL, $lang.'.UTF8');
setcookie('lang', $lang, time()+60*60*24*365);
$_SESSION['lang'] = $lang;
$_config['lang'] = $lang;
break;
case 'pl':
$lang = 'pl_PL';
putenv('LC_ALL='.$lang);
setlocale(LC_ALL, $lang.'.UTF8');
setcookie('lang', $lang, time()+60*60*24*365);
$_SESSION['lang'] = $lang;
$_config['lang'] = $lang;
break;
default:
if((isset($_SESSION['lang']) && $_SESSION['lang'] ='en_US') || (isset($_COOKIE['lang']) && $_COOKIE['lang'] = 'en_US')){
$lang = 'en_US';
putenv('LC_ALL='.$lang);
setlocale(LC_ALL, $lang.'.UTF8');
}
else{
$lang = 'pl_PL';
putenv('LC_ALL='.$lang);
setlocale(LC_ALL, $lang.'.UTF8');
}
$_config['lang'] = $lang;
break;
}
$my_name = 'default';
bindtextdomain($my_name,'./locale');
textdomain($my_name);
I can't get this script to change the language to pl_PL after I run ?setlang=pl action. When this get is empty, cookie value is changing to en_US ;/
How should I check it and avoid this problem?
Also I am working with MVC. Does this code seem to be right or should I put some code into model instead of controller?

Answer 1

if((isset($_SESSION['lang']) && $_SESSION['lang'] =='en_US')
|| (isset($_COOKIE['lang']) && $_COOKIE['lang'] == 'en_US'))
make comparisons with == not = this way you assign 'en_US' whatever the $_SESSION["lang"] or $_COOKIE["lang"] is.

Answer 2

Have you started the session? You cannot set or query session variables if you have not.
Use session_start();

Answer 3

$lang = "";
// Check if lang cookie is set
if(isset($_COOKIE['lang']))
{
$lang = $_COOKIE['lang'];
}
// Cookie is not set
else
{
// Get language GET variable
$set_lang = (empty($_GET['setlang'])) ? '' : $_GET['setlang'];
switch($set_lang)
{
case 'en':
$lang = "en_US";
break;
case 'pl':
$lang = "pl_PL";
break;
default:
$lang = "en_US";
break;
}
// Set language cookie
setcookie('lang', $lang, time()+60*60*24*365);
}
// Set locale
putenv('LC_ALL=' . $lang);
setlocale(LC_ALL, $lang . ".UTF8");