PHP's reflection api

reflection.php

<?php
// $Id$

function reflection_menu() {
  $items = array();

  $items['reflection-page'] = array(
      'page callback' => 'reflection_page',
      'title' => 'Reflection test',
      'access arguments' => array('access content'),
  );
  return $items;
}

function reflection_page() {
  $header = array("path", "Declared by", 'Callback', "Callback Location");
  foreach (module_implements('menu') as $hook) {
    // get the function by its ball
    $func = new ReflectionFunction($hook . '_menu');
    // know where it lives
    $fun = $func->getStartLine();
    // make it talk
    if ($results = $func->invoke()) {
      foreach ($results as $path => $item) {
        if (isset($item['file'])) {
          $row = array();
          $row[] = $path;
          // write down its address...
          $row[] = "Line " . $func->getStartLine() . " in " . $func->getFileName();
          if (isset($item['page callback']) && function_exists($item['page callback'])) {
            $row[] = $item['page callback'];
            // most includes have a module path
            $include_path = drupal_get_path('module', $hook);
            // but a sneaky few use other modules paths.....
            if (isset($item['file path'])) {
              $include_path = $item['file path'];
            }
            require_once($include_path . '/' . $item['file']);
            // now lets explore this function...
            $callback = new ReflectionFunction($item['page callback']);
            // same crap
            $row[] = "Line " . $callback->getStartLine() . " in " . $callback->getFileName();
            $rows[] = $row;
          }
        }
      }
    }
  }

  return theme('table', array('header' => $header, 'rows' => $rows,));
}
?>