title: PHP Fatal error: Call to a member function ... on a non-object : is case-sensitivity
body: <p>PHP 5.2 reports a "PHP Fatal error:  Call to a member function convert() on a non-object" although I specifically check that the object exists and that it contains the required method.</p>
  
  <p>Here is the PHP:</p>
  
  <pre><code>error_log(gettype($userform));
  error_log(method_exists($userform, "convert"));
  
  $result = $userForm-&gt;convert($arrData);
  </code></pre>
  
  <p>And here are the appropriate extracts from the error log:</p>
  
  <pre><code>[...] object
  [...] 1
  [...] PHP Fatal error:  Call to a member function convert() on a non-object
        in /file/name.php on line 140
  </code></pre>
  
  <p>And here is the method itself:</p>
  
  <pre><code>  public function convert(&amp;$arrData) {
      // Bare-bones code
      return true;
    }
  </code></pre>
  
  <p>What am I overlooking?</p>