如何访问Laravel集合对象中的第n个对象? [英] How to access the nth object in a Laravel collection object?

问题描述

我有一个laravel收集对象.

I have a laravel collection object.

我想在其中使用第n个模型.

I want to use the nth model within it.

我如何访问它?

在 laravel文档中找不到合适的方法.我可以在foreach循环中迭代集合，并在找到第n个项目时中断:

I cannot find a suitable method in the laravel documentation. I could iterate the collection in a foreach loop and break when the nth item is found:

foreach($collection as $key => $object)
{
    if($key == $nth) {break;}
}
// $object is now the nth one

但这似乎很混乱.

一种更简洁的方法是执行一次以上循环，并创建一个包含集合中所有对象的简单数组.但这似乎是不必要的重复.

A cleaner way would be to perform the above loop once and create a simple array containing all the objects in the collection. But this seems like unnecessary duplication.

在 laravel集合类文档中，有一个访存方法，但我认为这将从匹配主键的集合中获取一个对象，而不是集合中的第n个对象.

In the laravel collection class documentation, there is a fetch method but I think this fetches an object from the collection matching a primary key, rather than the nth one in the collection.

推荐答案

看到Illuminate\Support\Collection实现了ArrayAccess，您应该能够简单地使用方括号表示法，即

Seeing as Illuminate\Support\Collection implements ArrayAccess, you should be able to simply use square-bracket notation, ie

$collection[$nth]

这会在内部调用offsetGet，您也可以使用

This calls offsetGet internally which you can also use

$collection->offsetGet($nth)

最后，您可以使用get方法，该方法允许使用可选的默认值

and finally, you can use the get method which allows for an optional default value

$collection->get($nth)
// or
$collection->get($nth, 'some default value')

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