title: Full path of class name file in php autoloader
body: <p>I build my own autoload function, its prototype is:</p>
  
  <pre><code>function example_Autoloader($class_name)  
  </code></pre>
  
  <p>After that I register her in this way:  </p>
  
  <pre><code>spl_autoload_register('example_Autoloader');
  </code></pre>
  
  <p>Question is if can I calculate the full path of <code>$class_name</code>?</p>