public LanguageManagerInterface::getLanguages($flags = LanguageInterface::STATE_CONFIGURABLE)
Returns a list of languages set up on the site.
int $flags: (optional) Specifies the state of the languages that have to be returned. It can be: LanguageInterface::STATE_CONFIGURABLE, LanguageInterface::STATE_LOCKED, or LanguageInterface::STATE_ALL.
\Drupal\Core\Language\LanguageInterface[] An associative array of languages, keyed by the language code.
public function getLanguages($flags = LanguageInterface::STATE_CONFIGURABLE);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Language!LanguageManagerInterface.php/function/LanguageManagerInterface::getLanguages/8.1.x