public function setLang($lang)
    {
        if ($lang !== null) {
            if (!is_string($lang)) {
                throw new InvalidArgumentException(
                    'Language must be a string'
                );
            }
        }

        $this->lang = $lang;

        return $this;
    }
public function setLang($lang)
    {
        if ($lang !== null) {
            if (!is_string($lang)) {
                throw new InvalidArgumentException(
                    'Language must be a string'
                );
            }
        }

        $this->lang = $lang;

        return $this;
    }
public function setLang ( $ lang ) { if ( $ lang !== null ) { if ( ! is_string ( $ lang ) ) { throw new InvalidArgumentException ( 'Language must be a string' ) ; } } $ this -> lang = $ lang ; return $ this ; }
Set the origin language.

@param  string $lang The language code.
@throws InvalidArgumentException If the argument is not a string.
@return UserDataInterface Chainable
Set the origin language .