Environment::getLanguage() 

\nn\t3::Environment()->getLanguage(); 

Get the current language (as a number) of the frontend.

\nn\t3::Environment()->getLanguage();
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| @return int

Source Code 

public function getLanguage () {
	$languageAspect = GeneralUtility::makeInstance(Context::class)->getAspect('language');
	return $languageAspect->getId();
}
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