Helps view rendering for CodeIgniter 3.

view_helper.php

<?php
  function showView($view, $data = null)
  {
    $CI = get_instance();
    $CI->load->view('commons/layouts/header', $data);
    $CI->load->view($view, $data);
    $CI->load->view('commons/layouts/footer', $data);
  }
  function showJsonView($data, $status = 200)
  {
    exit($this->output
      ->set_status_header($status)
      ->set_content_type('application/json')
      ->set_output(json_encode($data))
      ->_display());
  }