如何使用字符串作为数组索引路径检索值？

本文介绍了如何使用字符串作为数组索引路径检索值？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

让说我有这样一个数组：

阵列（    [0] =＆GT;排列        （            [数据] =＆GT;排列                （                    [ID] =＆GT; 1                    [标题] =＆GT;经理                    [名] =＆GT;约翰·史密斯                ）         ）    [1] =＆GT;排列        （            [数据] =＆GT;排列                 （                     [ID] =＆GT; 1                     [标题] =＆GT;书记                     [名] =＆GT;                         （                             [首页] =＆GT;简                             [最后] =＆GT;工匠                         ）                 ）        ））

我希望能够建立我可以通过一个字符串将作为数组的索引路径，并且不使用的eval（）。这可能吗？

函数（$ indexPath，$ arrayToAccess）{    // $ indexPath会是这样的[0] ['数据'] ['名']这将返回    //经理人或者它可以[1] ['数据'] ['名'] ['第一']这将返回    //简，但会在索引路径数组索引量能    //变化，所以有可能是3，如第一个例子，或4类似的第二个。    返回$ arrayToAccess [$ indexPath] //＆LT; - 显然是行不通的}

解决方案

您可以使用数组作为路径（从左至右），那么递归函数：

$指数= {0，'数据'，'名'};功能的get_value（$索引，$ arrayToAccess）{   如果（计数（$索引）→1）    返回的get_value（array_slice（$索引，1），$ arrayToAccess [$索引[0]）;   其他    返回$ arrayToAccess [$索引[0]];}

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 ) ) ) )

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 }

解决方案

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]]; }