language_negotiation_configure_form in core/modules/locale/locale.admin.inc

Builds the configuration form for language negotiation.

language_negotiation_get_switch_links in core/includes/language.inc

Returns the language switch links for the given language.

language_negotiation_purge in core/includes/language.inc

Removes any unused language negotiation providers from the configuration.

language_negotiation_set in core/includes/language.inc

Saves a list of language negotiation providers.

language_provider_invoke in core/includes/language.inc

Helper function used to cache the language negotiation providers results.

locale_url_outbound_alter in core/modules/locale/locale.module

Implements hook_url_outbound_alter().