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我已经安装了一个 Worldpay 库，它在核心 PHP 中工作，但我尝试在 CodeIgniter 中使用我收到错误
Class 'Worldpay' not found
因为我没用
命名空间 Worldpay
如果我在 ci 中使用命名空间，那么它会给出错误。
Class 'Worldpay\CI_Controller' not found