PHP multi-dimentional array condensing - php

Question

I am using an array like this for a static file cache:
[
key => data => [
key1 => data => [...]
=> expires => 123456
key2 => data => [...]
=> expires => 123456
]
=> expires => 123456
]
This can be many levels deep (sometimes 10-15 levels).
What I would like to do is return only the values of data, so for instance, to create an array like so
[
key => key1 => [...]
=> key2 => [...]
]
how would I do this?
EDIT
print_r of the structure
Array (
[key] =>
Array (
[data] =>
Array (
[key1] =>
Array (
[data] => Array ( ... )
[expires] => 12345678)
[key2] =>
Array (
[data] => Array ( ... )
[expires] => 12345678
)
)
[expires] => 12345678
)
)

Answer 1

You can use recursive function like this:
function extractValues($array, &$result){
foreach($array as $key1 => $val1){
if($key1 == 'data' && is_array($val1)) {
foreach($val1 as $key2 => $val2){
if(is_array($val2)) {
$result[$key2] = array();
extractValues($val2, $result[$key2]);
} else {
$result[$key2] = $val2;
}
}
} else if(!in_array($key1, array('expires'))) {
$result[$key1] = array();
extractValues($val1, $result[$key1]);
}
}
return $result;
}
It will work on array structure like this:
$test = array(
'key' => array(
'data' => array(
'key1' => array(
'data' => array(
'key11' => 11,
'key12' => 12,
),
),
'key2' => array(
'data' => array(
'key21' => 21,
'key22' => 22,
),
),
),
'expires' => 12345,
),
);
$result = array();
extractValues($test, $result);
var_dump($result);
This is the result of the var_dump() hope meets your requirement:
array(1) {
["key"]=>
array(2) {
["key1"]=>
array(2) {
["key11"]=>
int(11)
["key12"]=>
int(12)
}
["key2"]=>
array(2) {
["key21"]=>
int(21)
["key22"]=>
int(22)
}
}
}