title: PHP Warning: Illegal string offset
body: <p>I am newbie in PHP.
  A PHP was migrated today from 5.3.3 to 5.4.4 version (Debian Squeeze to Debian Wheezy) and, after this, I get this error from Apache log :</p>
  
  <p><strong>> PHP Warning:  Illegal string offset 'phptype' in xyz</strong></p>
  
  <p>The line is:</p>
  
  <pre><code>self::$conn[$dsn['phptype']] = $mdb2;
  </code></pre>
  
  <p>I need help to restore the system.</p>