PHP get sub array dynamically

Question

I have an array (which will be dynamically populated) called $currentTree

Now I want to use this array to iterate over and another array called $tree

So, for example

$currentTree = array(5, 6, 2, 8);

becomes

$tree[5][6][2][8] = "hello world"; //the values of $currentTree is used to get the appropriate child node of array $tree

Is there any predefined PHP function I can use to achieve this?

why do you want to do that? i'm sure there will be better approaches than that; — hassan
– hassan, Commented Mar 15, 2017 at 8:23
I tried using array push, but that completely deletes the node and makes a new array in it's place. — Jay Ghosh
– Jay Ghosh, Commented Mar 15, 2017 at 8:23
is the format of fetching array index the same or varying.? Eg: for 5,6,2,8 array index will be 2,3,4,5. — Varun Krish
– Varun Krish, Commented Mar 15, 2017 at 8:23
No, for 5,6,2,8 the array index will also be 5,6,2,8. Basically I'll get the array index from the other array — Jay Ghosh
– Jay Ghosh, Commented Mar 15, 2017 at 8:24

LF-DevJourney · Accepted Answer · 2017-03-15 08:27:27Z

4

use reference, here is the live demo

<?php
$currentTree = array(-1, 5, 6, 2, 8);
$ref = &$tree;
    while($v = next($currentTree))
    {
      $ref = &$ref[$v];
    }
    $ref = "hello world";

    print_r($tree);

answered Mar 15, 2017 at 8:27

LF-DevJourney

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2 Comments

Jay Ghosh Over a year ago

Also, could you please explain what the & does? Is it a pointer reference?

LF-DevJourney Over a year ago

here is the & reference manual php.net/manual/en/language.references.php

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