PHP manipulating multidimensional array values by key

Question

I have tried the following:

$tree['uid1']['page'] = "page1";
$tree['uid1']['childs']['uid2']['page'] = "page2";
$tree['uid1']['childs']['uid3']['page'] = "page3";

array_walk_recursive($tree, function (&$item, $key) {
  echo $key.', ';
  if ($key == 'uid3') {
    // push array('childs' => array('uid4' => array('page' => 'page4')))
  }
});

But echo $key.', '; only returns me the last key ("page") Have I done something wrong or have I misunderstood the function "array_walk_recursive"

Community · Accepted Answer · 2017-05-23 10:25:31Z

2

If you take a look at the first comment at the documentation you will realice it doesn't work as you expected:

THIS FUNCTION ONLY VISITS LEAF NODES *

That is to say that if you have a tree of arrays with subarrays of subarrays, only the plain values at the leaves of the tree will be visited by the callback function. The callback function isn't ever called for a nodes in the tree that subnodes (i.e., a subarray). This has the effect as to make this function unusable for most practical situations.

If you want to check whether a key exist in your array or not, you might want to take a look at this solutions.

edited May 23, 2017 at 10:25

CommunityBot

11 silver badge

answered Jul 4, 2013 at 10:31

Alvaro

41.7k31 gold badges174 silver badges352 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

billyonecan Over a year ago

I was about to quote the exact same thing :p +1

Collectives™ on Stack Overflow

PHP manipulating multidimensional array values by key

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related