如何将对象(模型类型对象)插入到 Laravel 中特定索引号的集合对象中

我阅读了Dayle Rees的Code Bright篇文章，以了解更多关于拉威尔中使用的有说服力的Collection篇文章.我也做了一些其他的研究，但没有找到我想要的答案.

I want to insert an object (Model type object) into a Collection Object at a specific position.

For example:

这是退回的藏品

Illuminate\Database\Eloquent\Collection Object
(
    [0] => Attendance Object
        ([present_day] => 1)

    [1] => Attendance Object
        ([present_day] => 2)

    [2] => Attendance Object
        ([present_day] => 4) 

    [3] => Attendance Object
        ([present_day] => 5) 

)

As you can see above [present_day] have a values ranging from 1 to 5, but the value, 3 is missing in the sequence. Now, what I really want to do is, I want to explicitly put a new Attendance Object at the Collection Object's position of [2] index number/position, thus by pushing the rest of the Attendance Object. I am really struggling to do this right. How can I do this to make above collection object to look like something as below:

Illuminate\Database\Eloquent\Collection Object
(
    [0] => Attendance Object
        ([present_day] => 1)

    [1] => Attendance Object
        ([present_day] => 2)

    [2] => Attendance Object    // This is where new object was added.
        ([present_day] => 3) 

    [4] => Attendance Object
        ([present_day] => 4) 

    [5] => Attendance Object
        ([present_day] => 5) 

)

我认为如果是数组，有一些方法可以完全做到这一点.因为这是Collection，我不知道该怎么做.

Note:我不想把它转换成数组，在数组中插入.出于某种原因，我想把这个输出严格地放在Collection个对象中.