如何使用字符串作为数组索引路径来检索值? [英] How to use a string as an array index path to retrieve a value?

问题描述

假设我有一个像这样的数组:

Let say I have an array like:

Array
(
    [0] => Array
        (
            [Data] => Array
                (
                    [id] => 1
                    [title] => Manager
                    [name] => John Smith
                )
         )
    [1] => Array
        (
            [Data] => Array
                 (
                     [id] => 1
                     [title] => Clerk
                     [name] =>
                         (
                             [first] => Jane
                             [last] => Smith
                         )
                 )

        )

)

我希望能够构建一个函数，我可以将一个字符串传递给该函数，该函数将充当数组索引路径并在不使用 eval() 的情况下返回适当的数组值.这可能吗?

I want to be able to build a function that I can pass a string to that will act as the array index path and return the appropriate array value without using eval(). Is that possible?

function($indexPath, $arrayToAccess)
{
    // $indexPath would be something like [0]['Data']['name'] which would return 
    // "Manager" or it could be [1]['Data']['name']['first'] which would return 
    // "Jane" but the amount of array indexes that will be in the index path can 
    // change, so there might be 3 like the first example, or 4 like the second.

    return $arrayToAccess[$indexPath] // <- obviously won't work
}

推荐答案

你可以使用一个数组作为路径(从左到右)，然后是一个递归函数:

you might use an array as path (from left to right), then a recursive function:

$indexes = {0, 'Data', 'name'};

function get_value($indexes, $arrayToAccess)
{
   if(count($indexes) > 1) 
    return get_value(array_slice($indexes, 1), $arrayToAccess[$indexes[0]]);
   else
    return $arrayToAccess[$indexes[0]];
}

这篇关于如何使用字符串作为数组索引路径来检索值?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！