How to detect current selected language?

If you want to code something special for individual language you can detect the current selected language and write your code based on that.

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Detecting current language for Free version

For GTranslate free version the code of the current selected language is stored in googtrans cookie. It can be something like /en/es, which means that the page is translated from English to Spanish. You can get the code of the current selected language with JavaScript using the following piece of code:

/*
* If original language is selected, then the value of current_language 
* will be empty. Otherwise, it will contain the current selected
* language code.
*
*/
var current_language = gt_get_cookie('googtrans').split('/').pop();

// W3 Schools: https://www.w3schools.com/js/js_cookies.asp
function gt_get_cookie(cname) {
    var name = cname + "=";
    var decodedCookie = decodeURIComponent(document.cookie);
    var ca = decodedCookie.split(';');
    for(var i = 0; i <ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}

Detecting current language for paid versions

For GTranslate paid versions you can find the code of the current selected language from X-GT-Lang request header or from <html> lang attribute.

Below you can see an example of detecting the code of the current selected language with PHP:

/*
* If original language is selected, then the value of $current_language 
* will be empty. Otherwise, it will contain the current selected 
* language code.
*
*/
$current_lang = isset($_SERVER['HTTP_X_GT_LANG']) ? $_SERVER['HTTP_X_GT_LANG'] : '';

// To avoid caching of the original content
header('Cache-Control: no-cache');

Alternatively you can use JavaScript:

/*
* If original language is selected, then the value of current_language
* will be the lang attribute of your original page. Otherwise, it will
* contain the current selected language code.
*
*/
var current_lang = document.getElementsByTagName('html')[0].getAttribute('lang');