LL::get() 

\nn\t3::LL()->get($id = '', $extensionName = '', $args = [], $explode = '', $langKey = NULL, $altLangKey = NULL); 

Get localization for a specific key.

Uses the translations that are specified in the xlf of an extension. These files are located by default under EXT:extname/Resources/Private/Language/locallang.xlf or EXT:extname/Resources/Private/Language/en.locallang.xlf for the respective translation.

// Simple example:
\nn\t3::LL()->get(''LLL:EXT:myext/Resources/Private/Language/locallang_db.xlf:my.identifier');
\nn\t3::LL()->get('tx_nnaddress_domain_model_entry', 'nnaddress');

// Replace arguments in the string: 'After the %s comes the %s' or `Before the %2$s comes the %1$s'
\nn\t3::LL()->get('tx_nnaddress_domain_model_entry', 'nnaddress', ['one', 'two']);

// explode() the result at a separator character
\nn\t3::LL()->get('tx_nnaddress_domain_model_entry', 'nnaddress', null, ',');

// Translate to a language other than the current frontend language
\nn\t3::LL()->get('tx_nnaddress_domain_model_entry', 'nnaddress', null, null, 'en');
\nn\t3::LL()->get('LLL:EXT:myext/Resources/Private/Language/locallang_db.xlf:my.identifier', null, null, null, 'en');
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@param string $id
@param string $extensionName
@param array $args
@param string $explode
@param string $langKey
@param string $altLangKey
@return mixed

Source Code 

public function get( $id = '',  $extensionName = '', $args = [], $explode = '', $langKey = null, $altLangKey = null ) {
	$value = LocalizationUtility::translate($id, $extensionName, $args, $langKey, $altLangKey);
	if (!$explode) return $value;
	return GeneralUtility::trimExplode(($explode === true ? ',' : $explode), $value);
}
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