switchLang

<?php
switch ($modx->event->name) {
    
    case 'OnHandleRequest':
        if ($modx->context->key == 'mgr') {return;}
        
        if (!isset($_SESSION['lang']) && isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
            if (preg_match('/ru/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
              $_SESSION['lang'] = 'ru';
            }
            else if (preg_match('/fr/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
                $_SESSION['lang'] = 'fr';
            }
        }
        
        if (!empty($_GET['lang']) && $_GET['lang'] != $_SESSION['lang']) {
            if (in_array($_GET['lang'], array('ru','en','fr'))) {
                $_SESSION['lang'] = $_GET['lang'];
                $_GET['reload'] = true;
           }
        }
        
        $modx->setOption('cultureKey', $_SESSION['lang']);
        $modx->setPlaceholder('cultureKey', $_SESSION['lang']);
    break;
    
    case 'OnLoadWebDocument':
        if (!empty($_GET['reload'])) {
            if ($modx->resource->class_key == 'msProduct') {
                $modx->resource->clearCache();
            }
            $modx->sendRedirect($modx->makeUrl($modx->resource->id, '', '', 'full'));
        }
    break;
    
}