Show All Settings Page in WordPress Dashboard

This snippet does something neat – it adds an option under the Settings menu with a link named “All Settings” that shows a full list of all settings in the database related to your WordPress site.

The code below shows this option only to site administrators and hides it from other users.

function all_settings_link() {
   add_options_page(__('All Settings'), __('All Settings'), 'administrator', 'options.php');
}

add_action('admin_menu', 'all_settings_link');

For a broader WordPress overview, see What is WordPress?.