function gar_v2_default_page_manager_handlers(){
  $handlers = array();
  $path = dirname(__FILE__) . '/panels/task_handlers';
  $files = drupal_system_listing('.inc$', $path, 'name', 0);
  foreach ($files as $file) {
    include ($file->filename);
    if (!empty($handler->name)) {
      $handlers[$handler->name] = $handler;
    }
  }
  return $handlers;
}

/**
 * Implementation of hook_default_page_manager_pages()
 */
function hook_default_page_manager_pages() {
  $pages = array();
  $path = drupal_get_path('module', 'site') . '/panels';
  $files = drupal_system_listing('.inc$', $path, 'name', 0);
  foreach ($files as $file) {
    include_once $file->filename;
    if (!empty($page->name)) {
      $pages[$page->name] = $page;
    }
  }
  return $pages;
}

Generic page handler function

drupal

PHP