Apply function to every array key - php

Question

I am using Cassandra and I have saved some byte representations as ID. Everything is working fine, however that data (id) is no good for output.
$users = $db->get('1');
echo '<pre>';
print_r($users);
die();
Outputs
Array
(
[��� X��W��c_ ] => Array
(
[id] => ��� X��W��c_
[name] => steve
[surname] => moss
)
[�*B�X��y�~p��~] => Array
(
[id] => �*B�X��y�~p��~
[name] => john
[surname] => doe
)
)
As you can see ID's are some wierd characters, it's because they are byte representations in database. They actually look like \xf5*B\xa0X\x00\x11\xe1\x99y\xbf~p\xbc\xd1~.
In PHPCASSA there is function CassandraUtil::import(); to which I can pass these bytes and it will return guid. It works fine, but I want my array to automatically converted from bytes to guids.
Only option I find is looping through every item in array and assigning new value to it. Somehow I think that it is not the best approach. Is there any other ways to do this?
TL;DR
Have array with bytes like above, need to use CassandraUtil::import(); on array keys and id's to get readable id's. What is the most effective way of doing so.

Answer 1

UPDATE
Sorry, only saw the top level array key, I think you would have to run the function below as well as another one after:
function cassImportWalkRecur(&$item, $key)
{
if ($key == 'id')
$item = CassandraUtil::import();
}
$array = array_walk_recursive($array, 'cassImportWalkRecur');
That should apply it to the ID fields. If you need to check the data first, there maybe a way to detect the encoding, but I am not sure how to do that.
You should be able to create a function and use array_walk to traverse the array and update the keys. Something like:
function cassImportWalk($item, &$key)
{
$key = CassandraUtil::import();
}
$array = array_walk($array, 'cassImportWalk');
Untested (also you may have to change the CassandraUtil usage), but should work.

Answer 2

Unless I am misunderstanding the question this can be done simply and cleanly like so:
$users = $db->get('1');
$keys = array_keys($users);
$readableKeys = array_map("CassandraUtil::import",$keys);
foreach($users as $currentKey => $subArray) {
$readableKey = array_shift($readableKeys);
$subArray['id'] = $readableKey;
$users[$readableKey] = $subArray;
unset($users[$currentKey]);
}

Answer 3

Would array_flip() all keys and values, then array_walk() and apply my function, before doing a final array_flip().