title: i use a variable to echo the different title of different pages but i got an error
body: <p>[i got an error on using a variable ( $page_title ) for echo the page title but it does not work and show me an error ]
  [here is the code of header.php file]</p>
  
  <pre><code>&lt;head&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;title&gt;&lt;?php echo $page_title; ?&gt;&lt;/title&gt;
      &lt;meta name="description" content="sodalitesolutions"&gt;
      &lt;meta name="author" content="sodalitesolutions"&gt;
      &lt;meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"&gt;
      &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
      &lt;link rel="stylesheet" type="text/css" href="&lt;?php echo base_url('assets/bootstrap/css/bootstrap.css'); ?&gt;"&gt;
      &lt;link rel="stylesheet" type="text/css" href="&lt;?php echo base_url('assets/font-awesome/css/font-awesome.css'); ?&gt;"&gt;
      &lt;link rel="stylesheet" type="text/css" href="&lt;?php echo base_url('assets/style/slider.css'); ?&gt;"&gt;
      &lt;link rel="stylesheet" type="text/css" href="&lt;?php echo base_url('assets/style/mystyle.css'); ?&gt;"&gt;
  &lt;/head&gt;
  </code></pre>
  
  <p>[Error :: function: _error_handler]</p>