如何在Codeigniter中加载视图或在多个环境中使用redirect（）？

Want to check Environment and if matches some case then want to redirect or load some view. get_instance(); not working inside index.php where environment check
what i'm looking something like below:

if (ENVIRONMENT === "production")
{

    /*if(error ="db error")
    redirect("/someview","refresh");
    or load view header and footer
    */

}

i just confused about error handling mechanism in CI. By the help of stackoverflow users i found steps to turn off the errors . but now i can't handle those errors.

If you want to handle a certain error, You can redirect it to a certain view in the process as what you have mentioned in your question.

 // Assuming you have a [Home] Controller that extends to your [Common] parent class
 class Home extends Common {
    public function index()
    {
        $this->load->helper('url');
        $bCheck = false;
        if ($bCheck !== true) {
            $this->handleRedirectMethod('path/to/your/controller');
        }
    }
}

Then on your parent [Common] controller. (e.g Common.php)

class Common extends CI_Controller
{
    public function handleRedirectMethod($sUrl, $sMethodName = 'refresh', $sStatusCode = '302')
    {
        $sServerName = $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['HTTP_HOST'];
        redirect($sServerName . '/' . $sUrl, $sMethodName, $sStatusCode);
    }
}

Hope this makes you understand how you can handle those errors