如何创建动态PHP类

我有一个类配置。每当

'localhost'

位于

$\u服务器['HTTP\u HOST']

中时，我希望$db\u主机是

'localhost'

。默认情况下，它应该是

“defaulthost”

class Config {

    public static $db_username = 'username';
    public static $db_password = 'password';
    public static $db_database = 'database';

    public function __construct() {
        $host = 'defaulthost';
    if(stristr($_SERVER['HTTP_HOST'],'localhost')){
        $host = 'localhost';
    };
        self::$db_host = $host;
    }
 }

这个代码给了我一个错误

Fatal error:  Access to undeclared static property: Config::$db_host in /Users/aakilfernandes/Dropbox/Projects/codeharmony/scripts/dev/v02/class/Database.php on line 98

---

您只需要声明属性$db\u host

class Config {
    public static $db_username = 'username';
    public static $db_password = 'password';
    public static $db_database = 'database';
    public static $db_host = 'defaulthost';

    public function __construct() {
        if (stristr($_SERVER['HTTP_HOST'], 'localhost')){
            self::$db_host = 'localhost';
        }
    }
}

---

您应该像使用db_数据库一样初始化db_主机；-）

所以<代码>公共静态$db_主机应该解决这个问题。。。