gistfile1.php

<?php
// app/filters.php
App::before(function($request)
{
    // Set default locale.
    $mLocale = Config::get( 'app.locale' );

    // Has a session locale already been set?
    if ( !Session::has( 'locale' ) )
    {
        // No, a session locale hasn't been set.
        // Was there a cookie set from a previous visit?
        $mFromCookie = Cookie::get( 'locale', null );
        if ( $mFromCookie != null && in_array( $mFromCookie, Config::get( 'app.locales' ) ) )
        {
            // Cookie was previously set and it's a supported locale.
            $mLocale = $mFromCookie;
        }
        else
        {
            // attempt to detect locale from browser.
            $mFromBrowser = substr( Request::server( 'http_accept_language' ), 0, 2 );
            if ( $mFromBrowser != null && in_array( $mFromBrowser, Config::get( 'app.locales' ) ) )
            {
                // browser lang is supported, use it.
                $mLocale = $mFromBrowser;
            } // $mFromBrowser
        } // $mFromCookie

        Session::put( 'locale', $mLocale );
        Cookie::forever( 'locale', $mLocale );
    } // Session?
    else
    {
        // session locale is available, use it.
        $mLocale = Session::get( 'locale' );
    } // Session?

    // set application locale for current session.
    App::setLocale( $mLocale );
});