phprs\BindReturns::set PHP Method

    public function set($id, $params, $method_info)
    {
        Verify::isTrue(is_array($params) || is_string($params), "{$this->class_name}::{$this->method_name} invalid @return");
        if (is_string($params)) {
            $to = $params;
            $from = array();
        } else {
            $to = $params[0];
            $from = array_slice($params, 1);
        }
        $to_func =& $this->params[$to][$id];
        if ($this->auto_bind_return && ($to == 'body' || $to == 'res') && isset($this->params['body'][-1])) {
            unset($this->params['body'][-1]);
            // 指定了body输出, 去掉默认的body输出
        }
        if (0 === count($from)) {
            $to_func[0] = array(false, null, -1, null);
        }
        foreach ($from as $index => $name) {
            // 输入方法 $index变量序号 $name变量名
            $is_const = substr($name, 0, 1) != '$';
            if ($is_const) {
                // 输出常量, 不需要绑定变量
                $to_func[$index] = array(true, $name, 0, null);
                //[是否常量,  值 , 参数来源位置, 参数信息]
                continue;
            }
            $name = substr($name, 1);
            //变量输出, 需要绑定
            $pos = -1;
            $step = 0;
            //是(输出)方法的第几个参数
            foreach ($method_info as $item) {
                list($param_name, ) = $item;
                if ($name === $param_name) {
                    $pos = $step;
                    break;
                }
                $step++;
            }
            Verify::isTrue($pos !== -1, "{$this->class_name}::{$this->method_name} param: {$name} not found");
            //只能是引用
            list(, $is_ref, ) = $item;
            Verify::isTrue($is_ref, "{$this->class_name}::{$this->method_name} param: {$name} @return must be a reference");
            $to_func[$index] = array(false, $name, $pos, $item);
            //[是否常量,  值 , 参数位置, 参数信息]
        }
    }