Array manipulation (PHP) - php

Question

I have an array like this one :
Array
{
'property1.subproberty11' => "xxxxx",
'property1.subproberty12' => "yyyy",
'property2.subproberty21.subproperty211' => "zzzzzz",
'property2.subproberty21.subproperty212' => "wwwww",
'property2.subproberty22' => "yyyy",
....
That needs to be changed into something like :
Array
(
[property1] => Array
(
['subproberty11'] => "xxxxx"
['subproberty12'] => "yyyy"
)
[property2] => Array
(
[subproperty21] => Array
(
[subproperty211] => "zzzzzz"
[subproperty212] => "wwwwww"
)
['subproberty22'] => "yyyy"
)
...
I can't find a smart way of doing this, can someone help me ?
So, far, i have thought of this kind of algorithm :
$new_array = array();
foreach($old_array as $key => $value)
{
$subkeys = explode('.', $key);
$ss = array();
for($ii = 0 ; $ii < count($subkeys) ; $ii++)
{
$ss[] = "['".$subkeys[$ii]."']";
if ($ii < count($subkeys) -1)
eval('$new_array'.implode('',$ss).' = array();');
}
eval('$new_array'.implode('',$ss)." = '".$value."';');
}
I think we can do better, for example maybe we can avoid duplicating data by creating a new array ?

Answer 1

My working example:
function nestedKeysArray($input) {
$array = array();
foreach ($input as $key => $value) {
$keys = explode('.', $key);
if (count($keys) == 1) {
$array[$key] = $value;
} else {
$nested = &$array;
foreach ($keys as $k) {
if (!isset($nested[$k]))
$nested[$k] = array();
$nested = &$nested[$k];
}
$nested = $value;
}
}
return $array;
}
$input is array like first one from the question.
EDIT:
Changing original array, without copy:
function nestedKeysArray(&$input) {
foreach ($input as $key => $value) {
$keys = explode('.', $key);
if (count($keys) > 1) {
$nested = &$input;
foreach ($keys as $k) {
if (!isset($nested[$k]))
$nested[$k] = array();
$nested = &$nested[$k];
}
$nested = $value;
unset($input[$key]);
}
}
}

Answer 2

Some untested code, to give you the direction you could take.
Just loop through the array;
function SplitArray($properties) {
foreach($properties as $item=>$property) {
$properties[$item] = explode('.',$property, 2);
if(strpos($properties[$item][1], '.') === false)) {}
else {
$properties[$item][1] = SplitArray($properties[$item][1]);
}
}
return $properties;
}