Spayder,
if (isset($_SERVER['SERVER_NAME']) && isset($_SERVER['REQUEST_URI'])) {
$link = trim($_SERVER['SERVER_NAME'], '/\\') . '/' . trim($_SERVER['REQUEST_URI'], '/\\');
$link = rtrim(str_replace('index.php', '', $link), '/');
echo ($link == 'homeurl.ru') ? 'Is home' : 'Isn\'t home';
}