php slash to not slashes

			    $url = strtok($_SERVER['REQUEST_URI'], '?');
$last_char = substr($url, -1);
if ($last_char == '/' && $url != '/') {
    $url = substr($url, 0, strlen($url) - 1);
    if (!empty($_GET)) {
        $url .= '?' . http_build_query($_GET);
    }
    header('Location: ' . $url, 301);
        exit;
}