set_var example

 else {
            settype($target_array['vars'][$key], 'array');
            $target_array['vars'][$key][] = $value;
        }
    }

    private function add_global_vars(Array $vars) {
        if (!isset($this->compiler->config_data['vars'])) {
      $this->compiler->config_data['vars'] = Array();
        }
        foreach ($vars as $var) {
            $this->set_var($var, $this->compiler->config_data);
        }
    }

    private function add_section_vars($section_name, Array $vars) {
        if (!isset($this->compiler->config_data['sections'][$section_name]['vars'])) {
            $this->compiler->config_data['sections'][$section_name]['vars'] = Array();
        }
        foreach ($vars as $var) {
            $this->set_var($var, $this->compiler->config_data['sections'][$section_name]);
        }
    }