How to get list all multidimensional array with parent index - php

Question

How to get list all multidimensional array with parent index. All index in each level is unique and i want to show all list with the level.
example my arrays:
Array(
[1] => Array(
[2] => Array(
[3] =>
[4] =>
[7] =>
)
)
[6] => Array(
[11] => Array(
[12] => Array(
[17] =>
)
)
)
[2] => Array(
[13] => Array(
[14] =>
)
)
)
I want to get output like this:
Array
(
[1]=array([level] = 1)
[2]=array([level] = 2)
[3]=array([level] = 3)
[4]=array([level] = 3)
[7]=array([level] = 3)
[6]=array([level] = 1)
[11]=array([level] = 2)
[12]=array([level] = 3)
[17]=array([level] = 4)
...
)

Answer 1

Here is a solution using a recursive function. Assuming your array will have a NULL value if there is no more child/nested arrays.
$arr = array(1 => array(2 => array(3 => NULL,
4 => NULL,
7 => NULL )),
6 => array(11 => array(12 => array(17 =>NULL))),
2 => array(13 => array(14 => NULL)));
$rslt_arr = array();
function traverse_arr($array, $level)
{
$level++;
foreach ($array as $key => $value){
if($value != NULL){
traverse_arr($value, $level);
}
$GLOBALS['rslt_arr'][$key]['level'] = $level;
}
}
traverse_arr($arr, 0);
echo '<pre>';
print_r($rslt_arr);
OUTPUT:
Array
(
[3] => Array
(
[level] => 3
)
[4] => Array
(
[level] => 3
)
[7] => Array
(
[level] => 3
)
[2] => Array
(
[level] => 1
)
[1] => Array
(
[level] => 1
)
[17] => Array
(
[level] => 4
)
[12] => Array
(
[level] => 3
)
[11] => Array
(
[level] => 2
)
[6] => Array
(
[level] => 1
)
[14] => Array
(
[level] => 3
)
[13] => Array
(
[level] => 2
)
)