$error=sprintf(__('The server is running PHP version %1$s. The Plugin requires at least PHP version %2$s.','rrze-cache'),PHP_VERSION,RRZE_PHP_VERSION);
$error=sprintf(__('The server is running PHP version %s. The Plugin requires at least PHP version %s.','rrze-multilang'),PHP_VERSION,RRZE_PHP_VERSION);
$error=sprintf(__('The server is running WordPress version %1$s. The Plugin requires at least WordPress version %2$s.','rrze-cache'),$GLOBALS['wp_version'],RRZE_WP_VERSION);
}elseif(!defined('WP_CACHE')||!WP_CACHE){
$error=__('The constant WP_CACHE is not defined or is set to false.','rrze-cache');
$error=sprintf(__('The server is running WordPress version %s. The Plugin requires at least WordPress version %s.','rrze-multilang'),$GLOBALS['wp_version'],RRZE_WP_VERSION);
}elseif(!is_multisite()){
$error=__('The plugin is compatible only with WordPress Multisite.','rrze-multilang');