original_string: public static function extensionIdentifier(string $extensionKey): string {
      $extensionIdentifier = GeneralUtility::underscoredToUpperCamelCase($extensionKey);
      $extensionIdentifier = mb_strtolower($extensionIdentifier);
  
      return $extensionIdentifier;
    }
code: public static function extensionIdentifier(string $extensionKey): string {
      $extensionIdentifier = GeneralUtility::underscoredToUpperCamelCase($extensionKey);
      $extensionIdentifier = mb_strtolower($extensionIdentifier);
  
      return $extensionIdentifier;
    }
code_tokens: public static function extensionIdentifier ( string $ extensionKey ) : string { $ extensionIdentifier = GeneralUtility :: underscoredToUpperCamelCase ( $ extensionKey ) ; $ extensionIdentifier = mb_strtolower ( $ extensionIdentifier ) ; return $ extensionIdentifier ; }
docstring: Gets an extension identifier from an extension key.
  
  @param string $extensionKey The extension key
  @return string The extension identifier
docstring_tokens: Gets an extension identifier from an extension key .