m1 / Env

        if ($this->string_helper->startsWith("export", $line)) {

            $export_line = explode("export", $raw_line, 2);

            if (count($export_line) !== 2 || empty($export_line[1])) {

                throw new ParseException(

                    'You must have a export key = value',

                    $this->origin_exception,

                    $this->file,

                    $raw_line,

                    $this->line_num

                );

            }

            $line = trim($export_line[1]);

        }

    {

        $variable_default = explode($parameter_symbol, $variable_name, 2);

        if (count($variable_default) !== 2 || empty($variable_default[1])) {

            throw new ParseException(

                'You must have valid parameter expansion syntax, eg. ${parameter:=word}',

                $this->parser->origin_exception,

                $this->parser->file,

                $variable_name,

                $this->parser->line_num

            );

        }

        return array(trim($variable_default[0]), trim($variable_default[1]));

    }