--- title: "Localization" manual: "TYPO3 Explained" version: "13.4" permalink: "https://docs.typo3.org/permalink/t3coreapi:localization@13.4" source: "ExtensionArchitecture/Extbase/Reference/Localization.rst" rendered: "2026-09-20T16:02:56+00:00" --- # Localization {#localization} Multilingual websites are widespread nowadays, which means that the web-available texts have to be localized. Extbase provides the helper class `\TYPO3\CMS\Extbase\Utility\LocalizationUtility` for the translation of the labels. Besides, there is the Fluid ViewHelper ``, with the help of whom you can use that functionality in templates. The localization class has only one public static method called `translate`, which does all the translation. The method can be called like this: **EXT:my_extension/Classes/Controller/SomeController.php** ```php use TYPO3\CMS\Extbase\Utility\LocalizationUtility; $someString = LocalizationUtility::translate($key, $extensionName, $arguments); ``` - **`$key`** The identifier to be translated. If the format *LLL:path:key* is given, then this identifier is used, and the parameter `$extensionName` is ignored. Otherwise, the file `Resources/Private/Language/locallang.xlf` from the given extension is loaded, and the resulting text for the given key in the current language returned. - **`$extensionName`** The extension name. It can be fetched from the request. - **`$arguments`** It allows you to specify an array of arguments. In the `LocalizationUtility`, these arguments will be passed to the function `vsprintf`. So you can insert dynamic values in every translation. You can find the possible wildcard specifiers under [https://www.php.net/manual/function.sprintf.php#refsect1-function.sprintf-parameters](https://www.php.net/manual/function.sprintf.php#refsect1-function.sprintf-parameters). *Example language file with inserted wildcards* **EXT:my_extension/Resources/Private/Language/locallang.xlf** ```xml

You have %d posts with %d comments written.

Hello %s! ``` *Called translations with arguments to fill data in wildcards* **EXT:my_extension/Classes/Controller/SomeController.php** ```php use TYPO3\CMS\Extbase\Utility\LocalizationUtility; $someString = LocalizationUtility::translate('count_posts', 'BlogExample', [$countPosts, $countComments]) $anotherString = LocalizationUtility::translate('greeting', 'BlogExample', [$userName]) ```