title: Cannot access protected property CI_DB_mysqli_driver::$_protect_identifiers
body: <p>I am getting 
  Cannot access protected property CI_DB_mysqli_driver::$_protect_identifiers
  Code as follows</p>
  
  <pre><code>function xyz($use_protech_identifier = false)
  {
   $this-&gt;db-&gt;_protect_identifiers=$use_protech_identifier;
  }
  </code></pre>