php用静态类实现的页面跳转

<?php
/**
 * Miscellaneous utility methods.
 */
final class Utils {
    private function __construct() {   
    }
/**
     * Redirect to the given page.
     * @param type $page target page
     * @param array $params page parameters
     */
    public static function redirect($page, $sub_page = null, array $params = array()) {
        header('Location: ' . self::createLink($page, $sub_page, $params));
        die();
    }

/**
     * Generate link.
     * @param string $page target page
     * @param array $params page parameters
     */
    public static function createLink($page, $sub_page = null, array $params = array()) {
        if ($sub_page) {
            $params = array_merge(array('sub_page' => $sub_page), $params);
        }
        if (!$page) {
            return "#";
        }
        $param_str = http_build_query($params);
        if (trim($param_str) == "") {
            return $page . '.php';
        } else {
            return $page . '.php?' . $param_str;
        }
    }
}
?>

<?php
if (UserLogin::isLogin() && $_COOKIE["user_id"]==1) {
    UserLogin::delUserInfo();
}
else if (UserLogin::isLogin()){
    Utils::redirect('welcome');
}
?>