function media_uninstall() {
  foreach (media_variable_default() as $name => $value) {
    media_variable_del($name);
  }
}

define('MEDIA_VARIABLE_NAMESPACE', 'media__');

/**
 *  The default variables within the Media namespace.
 *
 *  @param string $name
 *    Optional variable name to retrieve the default. Note that it has not yet
 *    been pre-pended with the MEDIA_VARIABLE_NAMESPACE namespace at this time.
 *  @return unknown
 *    The default value of this variable, if it's been set, or NULL, unless
 *    $name is NULL, in which case we return an array of all default values.
 *
 *  @see media_variable_get()
 *  @see media_variable_set()
 *  @see media_variable_del()
 */
function media_variable_default($name = NULL) {
  static $defaults;

  if (!isset($defaults)) {
    $defaults = array(
      'wysiwyg_title' => 'Media browser',
      'wysiwyg_icon_title' => 'Add media',
      //@todo: We should do this per type actually.  For "other" it should be a link.
      'wysiwyg_default_view_mode' => 'media_large',
      // Types which can be selected when embedding media vs wysiwyg.
      'wysiwyg_allowed_types' => array('image', 'video'),
      // Attributes which can be modified via the wysiwyg and persist.
      'wysiwyg_allowed_attributes' => array('height', 'width', 'hspace', 'vspace', 'border', 'align', 'style', 'alt', 'title', 'class', 'id'),

      'field_select_media_text' => 'Select media',
      'field_remove_media_text' => 'Remove media',

      // Name of the theme to use in media popup dialogs, defaults to admin_theme
      'dialog_theme' => '',
      // @TODO: Make a configuration form with this.
      'file_extensions' => 'jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp mp3 mov m4v mp4 mpeg avi ogg wmv ico',
      'max_filesize' => '',
      'debug' => FALSE,

      'file_list_size' => 10,

      // Used in media.xml.inc: how long to cache retrieved remote data.
      'xml_cache_expire' => 3600,

      // Browser defaults in media.browser.inc.
      'browser_viewtype_default' => 'thumbnails',
      'browser_pager_limit' => 40,
      'browser_library_empty_message' => 'There are currently no media in this library to select.',

      'import_batch_size' => 20,
      'fromurl_supported_schemes' => array('http', 'https', 'ftp', 'smb', 'ftps'),
      'type_icon_directory' => drupal_get_path('module', 'media') . '/images/types',
      'icon_base_directory' => drupal_get_path('module', 'media') . '/images/icons',
      'icon_set' => 'default',
      
       // This is set in media_enable().  It will show a persistant dsm on every page
       // until the user runs the batch operation provided by media_admin_rebuild_types_form().
      'show_file_type_rebuild_nag' => FALSE,
    );
  }

  if (!isset($name)) {
    return $defaults;
  }

  if (isset($defaults[$name])) {
    return $defaults[$name];
  }
}

Hi all,

I have a module that uses quite a few variables and would like to remove them in my hook_uninstall() function, but I don't want to have to list them all manually...

I see three ways to do this:
1 - Run variable_del() for each variable manually
2 - List all variables then remove the ones that start with my module's name
3 - Delete variables directly from the database that start with my module's name

I'm obviously trying to avoid #1.
I've used #2 before (http://drupalbin.com/18718) but am worried about the possible performance implications of running a foreach() on every variable in Drupal... Is this good or not?
I'd prefer not to resort to using SQL to delete variables from the database directly as in #3, but this may be the only recommended option...

What is the recommended way to call variable_del() on a bunch of variables? I'm using D7 if that helps.
Thanks.

-- 
Kind regards,
Peter Anderson.
http://panda.id.au

-- 
Aaron Winborn

Advomatic, LLC
http://advomatic.com/

Drupal Multimedia available now!
http://www.packtpub.com/create-multimedia-website-with-drupal/book

My blog:
http://aaronwinborn.com/