d9ac568d_YPO3_Core_APIs_7_documentation__Description
[Class name] \TYPO3\CMS\Core\Charset\CharsetConverter [Usage] In the backend, available as $GLOBALS['LANG']->csConvObj In the frontend, available as $GLOBALS['TSFE']->csConvObj [Description] 
Character Set handling API Contains native PHP code to handle character set conversion based on charset tables from Unicode.org. You should use this class whenever you need to handle character set conversion or to perform multibyte-safe string operations (like getting the length, cropping, etc.).
TYPO3 Core APIs 7 documentation
Description