How to use header in codeigniter?

@lizzie 

In CodeIgniter, you can use the $this->output->set_header() method to set headers in your controller methods.

Here is an example of how you can use headers in CodeIgniter:

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class YourController extends CI_Controller {

    public function index() {
        // Set a custom header
        $this->output->set_header('X-Custom-Header: Custom Value');

        // Send JSON content type header
        $this->output->set_header('Content-Type: application/json');

        // Load a view
        $this->load->view('your_view');
    }

}

In this example, we are setting a custom header X-Custom-Header: Custom Value and setting the Content-Type header to application/json. You can set any type of header using this method.

Make sure to set the headers before any output is sent to the browser.