title: how to check version of codeigniter framework?
body: <p>I recently setup a old Codeigniter framework on my xampp.But i don't know the version of this framework.
   I use the code </p>
  
  <pre><code>&lt;?php echo CI_VERSION; ?&gt; 
  </code></pre>
  
  <p>but its give me error</p>
  
  <pre><code>Notice: Use of undefined constant CI_VERSION - assumed 'CI_VERSION' in /opt/lampp/htdocs/projectname/views/v_header.php on line 57
  CI_VERSION
  </code></pre>
  
  <p>Please guide me, I am new in Codeigniter. </p>