动态访问多维数组值 [英] Dynamically accessing multidimensional array value

问题描述

我正在尝试查找(或创建)一个函数.我有一个多维数组:

I'm trying to find (or create) a function. I have a multidimensional array:

$data_arr = [
    "a" => [
        "aa" => "abfoo",
        "ab" => [
            "aba" => "abafoo",
            "abb" => "abbfoo",
            "abc" => "abcfoo"
        ],
        "ac" => "acfoo"
    ],
    "b" => [
        "ba" => "bafoo",
        "bb" => "bbfoo",
        "bc" => "bcfoo"
    ],
    "c" => [
        "ca" => "cafoo",
        "cb" => "cbfoo",
        "cc" => "ccfoo"
    ]
];

我想使用一维数组访问一个值，如下所示:

And I want to access a value using a single-dimentional array, like this:

$data_arr_call = ["a", "ab", "abc"];

someFunction( $data_arr, $data_arr_call ); // should return "abcfoo"

似乎已经有一种用于此类事物的函数，我只是不知道要搜索什么.

This seems like there's probably already a function for this type of thing, I just don't know what to search for.

推荐答案

尝试一下

function flatCall($data_arr, $data_arr_call){
    $current = $data_arr;
    foreach($data_arr_call as $key){
        $current = $current[$key];
    }

    return $current;
}

OP的解释:

$current变量被迭代建立，如下所示:

OP's Explanation:

The $current variable gets iteratively built up, like so:

flatCall($data_arr, ['a','ab','abc']);

1st iteration: $current = $data_arr['a'];
2nd iteration: $current = $data_arr['a']['ab'];
3rd iteration: $current = $data_arr['a']['ab']['abc'];

您还可以在每次迭代中执行if ( isset($current) ) ...来提供错误检查.

You could also do if ( isset($current) ) ... in each iteration to provide an error-check.

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