从各子阵列获取特定元素 [英] Get specific element from each sub array

问题描述

我有我敢肯定，必须有PHP处理内置阵列功能的通用模式，但只是无法看到它。

I have a common pattern which Im sure there must be a built-in array function in PHP to handle but just can't see it.

我有多个阵列，如以下内容：

I have multiple arrays such as the following:

$testArray = array (
    'subArray1' => array(
        'key1' => "Sub array 1 value 1",
        'key2' => "Sub array 1 value 1"
    ),
    'subArray2' => array(
        'key1' => "Sub array 2 value 1",
        'key2' => "Sub array 2 value 2"
    )
);

我需要从每个子阵列，其中可以有任意数量获得键1 值。

我总是最后只是遍历每个阵列来获得所需的值，但我敢肯定，必须有处理这一个更简单，更有效的方式。

I always end up just looping over each array to get the required values, but I'm sure there must be an easier, more efficient way to handle this.

我目前使用下面这个简单的foreach解析数组：

I am currently using the following simple foreach to parse the arrays:

$preparedSubs = array();

foreach($testArray as $subArray) {
    $preparedSubs[] = $subArray['key1'];
}

这是短，我能做好，但正如我所说，我肯定有一个PHP的构造，将处理这更好的。

It's as short as I can make it, but as I said I'm sure there is a PHP construct that would handle this better.

推荐答案

PHP 5.5之前，这将是最有效的解决方案：

Before PHP 5.5, this would be the most efficient solution:

$key = 'key1';

$output = array_map(function($item) use ($key) {
    return $item[$key];
}, $testArray);

在PHP 5.5中，有现在是一个 array_column 函数这个（见的线圈的回答）。

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