通过对象内部的键从对象数组获取字段值 [英] Getting field value from object array by key inside object

问题描述

这是一个非常愚蠢的问题，我无法相信我正在询问类似这样的简单问题.

This is very stupid question and I can't believe that im asking about something simple like this.

我使用db->get['table']->result()从表中获取数据.

Im using db->get['table']->result() to get data from table.

表架构如下所示:table(id，col1，col2).

Table schema looks like this: table(id, col1, col2).

db->get['table']->result()返回类似以下内容的内容(print_r):

db->get['table']->result() returns something like this (print_r):

Array
(
[0] => stdClass Object
    (
        [id] => 1
        [col1] => "id 1 col 1"
        [col2] => "id 1 col 2"
    )

[1] => stdClass Object
    (
        [id] => 2
        [col1] => "id 2 col 1"
        [col2] => "id 2 col 2"
    )

[2] => stdClass Object
    (
        [id] => 3
        [col1] => "id 3 col 1"
        [col2] => "id 3 col 2"
    )
}

现在，我需要从id = 2的行中获取col2值，我想在没有"foreach"循环的情况下做到这一点.

Now i need to get col2 value from row that has id=2, i want to do it without "foreach" loop.

我以为我可以这样做:

$valueThatINeed = $myArray[2]->col2;

这是错误的，我知道为什么会出错.

This is wrong and i know why its wrong.

问题是-如何直接获得我需要的东西而没有循环?

Question is - how to directly get that what i need without loop?

推荐答案

嗯，您可以将array_uintersect与仅比较$ id属性的回调函数一起使用，但是有点笨拙，并且可能不会比简单的for循环快

Hmm, you could probably use array_uintersect with a callback function that compares just the $id property but it's a bit clumsy, and probably no faster than a simple for loop.

也许我们应该从另一个角度出发...也许找到正确记录的最有效方法是在数据库上触发SELECT查询-毕竟这正是针对数据库进行了优化的对象，尤其是作为id的对象列将被索引(假设id是主键).

Perhaps we should come at this from a different angle... Probably the most efficient way to find the right record is to fire a SELECT query at the database - after all that's exactly what databases are optimised for, especially as the id column will be indexed (assuming id is the primary key).

原始帖子:

我认为它不仅简单:

I assume it's not just as simple as:

$ valueThatINeed = $ myArray [2]-> $ col2;

$valueThatINeed = $myArray[2]->$col2;

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