convert nested structure to flat key value pairs - php

Question

I have nested structure very similar to folder structure, like:
Array
(
[level_one_1] => Array
(
[level_two_1] => value1
[level_two_2] => valuetwo
[level_two_3] => value_three
)
[level_one_2] => Array
(
[level_two_4] => value1
[level_two_5] => valuetwo
[level_two_6] => value_three
)
[level_one_3] => Array
(
[level_two_2] => valuetwo
[level_two_3] => value_three
)
)
Is it a quick way to covert it to something like this:
Array
(
[level_one_1/level_two_1] => value1
[level_one_1/level_two_2] => valuetwo
[level_one_1/level_two_3] => value_three
[level_one_2/level_two_4] => value1
[level_one_2/level_two_5] => valuetwo
[level_one_2/level_two_6] => value_three)
[level_one_3/level_two_2] => valuetwo
[level_one_3/level_two_3] => value_three
)
Slash between levels would be separator - it could anything. Also it would be dynamic numbers of levels.
Is it a way to do so by using predefined array* functions ? with recursion ?

Answer 1

Something like this. Untested, but should help you get started in the right direction:
$myArray = array(
'level_one_1' => array(
'level_two_1' => 'value1',
'level_two_2' => 'valuetwo',
'level_two_3' => 'value_three'
),
'level_one_2' => array(
'level_two_4' => 'value1',
'level_two_5' => 'valuetwo',
'level_two_6' => 'value_three'
),
'level_one_3' => array(
'level_two_2' => 'valuetwo',
'level_two_3' => 'value_three'
));
$ritit = new RecursiveIteratorIterator(new RecursiveArrayIterator($myArray));
$result = array();
foreach ($ritit as $leafValue) {
$keys = array();
foreach (range(0, $ritit->getDepth()) as $depth) {
$keys[] = $ritit->getSubIterator($depth)->key();
}
$result[ join('/', $keys) ] = $leafValue;
}