If you pass this particular function a user id, it returns all the posts made by that user in reverse-chronological order, all bundled in a nice, multidimensional array.
如果为这个函数传递一个用户ID，它将在一个多维数组中按日期倒序的顺序返回那个用户发出的贴子。
The krsort() function sorts an array by the keys in reverse order. The values keep their original keys.
函数的作用是：对数组按照键名逆向排序，元素的键名保持不变。
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