按键=>值分割PHP数组 [英] Split PHP Array by Key=>Value

问题描述

我有一个像这样的二维数组:

I have a two dimensional array like this:

$array = [
    [..., "key"=>"key 1",...],
    [..., "key"=>"key 2",...],
    [..., "key"=>"key 2",...],
    [..., "key"=>"key 3",...],
    [..., "key"=>"key 3",...],
    [..., "key"=>"key 3",...],
];

我希望从该数组中获得一个三维数组，并用相同的键"值拆分，
像这样:

I want a three dimensional array from this array, splitted by the same "key" value,
like this:

$array_output = [
    [
        [..., "key"=>"key 1",...],
    ],
    [
        [..., "key"=>"key 2",...],
        [..., "key"=>"key 2",...],
    ],
    [
        [..., "key"=>"key 3",...],
        [..., "key"=>"key 3",...],
        [..., "key"=>"key 3",...],
    ],
];

推荐答案

您可以使用

You can do that with array-reduce. Consider this example:

$arr = [];
$arr[] = array("key" => "key1", "v" => "a");
$arr[] = array("key" => "key2", "v" => "b");
$arr[] = array("key" => "key3", "v" => "c");
$arr[] = array("key" => "key2", "v" => "d");
$arr[] = array("key" => "key2", "v" => "e");

function reduceByKey($carry, $item) {
    $carry[$item["key"]][] = $item;
    return $carry;
}
$res = array_values(array_reduce($arr, "reduceByKey",[]));

现在 $ res 将显示您的输出.请注意， $ arr 中的键顺序不相关.

Now $res will have your output. Notice that the order of the keys in $arr in not relevant.

这篇关于按键=>值分割PHP数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！