如何制作动态PHP类

Question

我有一个班级配置。每当'localhost'位于$_SERVER['HTTP_HOST']时，我希望$ db_host为'localhost'。默认情况下，它应为'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;
    }
 }

此代码给我一个错误

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

Answer 1

您只需要声明属性$ db_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';
        }
    }
}

Answer 2

您应该像使用db_database ;-)

一样初始化db_host