TYPO3 Core

/**

* convert String to uppercase

* this is substitution for strtoupper to avoid locale problems with Turkish

*

* @param string Input string

* @return string Uppercase String

*/

public static function strtoupper($str) {

return strtr((string) $str,'abcdefghijklmnopqrstuvwxyz','ABCDEFGHIJKLMNOPQRSTUVWXYZ');

}

/**

* convert String to lowercase

* this is substitution for strtolower to avoid locale problems with Turkish

*

* @param string Input string

* @return string Lowercase String

*/

public static function strtolower($str) {

return strtr((string) $str, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghijklmnopqrstuvwxyz');

}