如何获得特定“键"的数组.在多维数组中而不循环 [英] How to get an array of specific "key" in multidimensional array without looping

问题描述

假设我具有以下多维数组(从MySQL或服务检索):

Let's assume I have the following multidimensional array (retrieved from MySQL or a service):

array(
    array(
        [id] => xxx,
        [name] => blah
    ),
    array(
        [id] => yyy,
        [name] => blahblah
    ),
    array(
        [id] => zzz,
        [name] => blahblahblah
    ),
)

我们可以在一个"内置" php函数调用中获得一个由id组成的数组吗?或一行代码?
我知道传统的循环并获得价值，但我不需要这个:

Can we get an array of ids in one "built-in" php function call? or one line of code?
I am aware of the traditional looping and getting the value but I don't need this:

foreach($users as $user) {
    $ids[] = $user['id'];
}
print_r($ids);

也许某些array_map()和call_user_func_array()可以发挥作用.

Maybe some array_map() and call_user_func_array() can do the magic.

推荐答案

从php 5.5开始，您可以使用 array_column :

Since php 5.5, you can use array_column:

$ids = array_column($users, 'id');

这是任何现代项目的首选选项.但是，如果必须支持php> 5.5，则存在以下替代方法:

This is the preferred option on any modern project. However, if you must support php > 5.5, the following alternatives exist:

从php 5.3开始，您可以将 array_map 与匿名函数，如下所示:

Since php 5.3, you can use array_map with an anonymous function, like this:

$ids = array_map(function ($ar) {return $ar['id'];}, $users);

在 _{^{(技术上为php 4.0.6 +)}} 之前，您必须使用

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