这里的问题是 $seller 不是一个真正的"属性(Yii 通过使用魔法 __get 方法)，因此实际上您正在尝试修改函数的返回值(无效).就好像你试图这样做:

The problem here is that $seller is not a "real" property (Yii implements properties on its Models by using the magic __get method), so in effect you are trying to modify the return value of a function (which has no effect). It is as if you tried to do:

function foo() {
    return 42;
}

// INVALID CODE FOR ILLUSTRATION
(foo())++;

我不确定此行为在不同 PHP 版本上的状态，但您可以使用一个简单的解决方法:

I 'm not sure about the status of this behavior on different PHP versions, but there is an easy workaround you can use:

$seller = $this->seller;
$seller->current_item++;
$seller->wins++;
$seller->save();