更新时间:2023-02-21 14:58:51
解决方案是:
foreach ($unavailable as &$each) // see that & here?
在$each
中添加&
意味着对$each
所做的所有更改都将应用于$unavailable
的元素.
Adding &
to $each
means that all changes made to $each
will be applied to elements of $unavailable
.