blog form

The index() method does not run when you are routed to the blog_form() method. If you want code to run for every method in a controller, you need to create a constructor:

PHP Code:

class Blog extends CI_Controller 
{
    public function __construct()
    {
        parent::__construct();

        $this->load->helper(array('form', 'url'));
        $this->load->library('form_validation');
        $this->load->model('blog_model');
    }

    public function index()
    {
        $data['title']   = $this->blog_model->select_blog();
        $data['content'] = $this->blog_model->select_blog();
        $data['date']    = $this->blog_model->select_blog();
        
        $this->load->view('blog', $data);
    }
    
    public function blog_form()
    {
        $this->load->view('blog_form');
    }
} 


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Practical CodeIgniter 3
CodeIgniter Testing Guide