function posts($category = 0) {
      if ($this->session->userdata('student_login') != 1)
        redirect(base_url(), 'refresh');

      $page_data['category_filter'] = $category;
      $page_data['page_name']         = 'posts';
      $page_data['page_title']        = 'Postagens';
      $this->load->view('backend/index', $page_data);
    }
     function create_comment($post) {
      if ($this->session->userdata('student_login') != 1)
        redirect(base_url(), 'refresh');
        $data['content'] = $this->input->post('comment');
       $data['post_id'] = $post;
       $data['created_by_student'] = $this->session->userdata('student_id');
       $data['created_by'] = 'student';
       $data['created_at'] = date('d/m/Y H:m');
        $this->db->insert('post_comments', $data);
        $this->session->set_flashdata('flash_message', 'Enviado com sucesso');
       redirect(site_url('student/posts'), 'refresh');
     }
      function delete_comment($comment) {
      if ($this->session->userdata('student_login') != 1)
        redirect(base_url(), 'refresh');
       $this->db->where('id', $comment);
      $this->db->delete('post_comments');
      $this->session->set_flashdata('flash_message', 'Removido com sucesso');
      redirect(site_url('student/posts'), 'refresh');
    }