Find key in multidimensional array and change the value

Question

I'm writing a PHP script in which I got a multidimensional array without fixed depth. Eg:

$myArray = [
  'item01' => [
      'section01' => [
        'part01'
      ]
    ],
  'item02' => [
    'section02' => [
      'part02' => [
        'something01'
      ]
    ]
  ],
  'item03' => [
    'section03'
  ]
]

I have a string that contains the path to the value that should be changed. Eg:

$myPath = 'item02/section02/part02'

And I have the new value:

$myValue = 'somethingElse'

What I'm trying to do, is go through array $myArray following the path set in $myPath to change the value to $myValue.

The expected output, with the examples above, would be this:

$myArray = [
  'item01' => [
      'section01' => [
        'part01'
      ]
    ],
  'item02' => [
    'section02' => [
      'part02' => [
        'somethingElse'
      ]
    ]
  ],
  'item03' => [
    'section03'
  ]
]

I've tried several ways, but keep getting stumped on this. In the end, it always reaches a point where the solution is, at its core, the same. Rubber duckying didn't help either. Other programmers I know, haven't been able to find a solution either.

I'm hoping someone here can at least provide some fresh ways to look into this.

PS: Everything above is in pseudo-code, as this problem doesn't seem to be language-specific.

Not a duplicate. That one is for a multidimensional array with fixed depth. All solutions offered in that question won't work with the problem explained here. — Raf, Oct 06 '17 at 13:11
@mega6382 It most certainly did! I'm a bit surprised, as I tried this before too and it didn't work then. I must've made a tiny error somewhere. I'll see what that was after wrapping this up. Thanks for the help! — Raf, Oct 06 '17 at 14:03

mega6382 · Accepted Answer · 2017-10-06T13:54:53.237

1

try the following:

$myPath = 'item02/section02/part02';
$path = explode('/', $myPath);

$arr = &$myArray;
foreach($path as $key)
{
    $arr = &$arr[$key];
}

$arr = "somethingElse";

var_dump($myArray);

First turn the $myPath string into an array of keys using explode.

This uses a simple loop foreach loop to loop over the array using keys, and then by passing the values by reference it replaces the deepest value. Demo Here

edited Oct 06 '17 at 13:54

answered Oct 06 '17 at 13:24

mega6382

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1

Thanks! This seems to work in the demo. I've tried it in my code now, and it seems to work as well! The odd thing is, I tried this before as well, but it kept overriding the entire array. I'm curious as to what the difference is. I'll look into that after wrapping this up. – Raf Oct 06 '17 at 14:01

Find key in multidimensional array and change the value

1 Answers1