language_initialize in drupal-7.x/includes/language.inc

Chooses a language based on language negotiation provider settings.

language_negotiation_get in drupal-7.x/includes/language.inc

Checks whether a language negotiation provider is enabled for a language type.

language_negotiation_info in drupal-7.x/includes/language.inc

Returns all the defined language negotiation providers.

LocaleUILanguageNegotiationTest::testLanguageDomain in drupal-7.x/modules/locale/locale.test

Tests url() when separate domains are used for multiple languages.

LocaleUILanguageNegotiationTest::testUILanguageNegotiation in drupal-7.x/modules/locale/locale.test

Tests for language switching by URL path.

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