Convert flat array with dot-delimited keys to nested array - php

Question

I am trying to created nested array from flat based on its keys.
Also format of keys in original array can be changed if it will simplify task.
From :
$arr = [
'player.name' => 'Joe',
'player.lastName' => 'Snow',
'team.name' => 'Stars',
'team.picture.name' => 'Joe Snow Profile',
'team.picture.file' => 'xxx.jpg'
];
To:
$arr = [
'player' => [
'name' => 'Joe'
, 'lastName' => 'Snow'
]
,'team' => [
'name'=> 'Stars'
,'picture' => [
'name' => 'Joe Snow Profile'
, 'file' =>'xxx.jpg'
]
],
];

Answer 1

Here is my take on it.
It should be able to handle arbitrary depth
function unflatten($arr) {
$result = array();
foreach($arr as $key => $value) {
$keys = explode(".", $key); //potentially other separator
$lastKey = array_pop($keys);
$node = &$result;
foreach($keys as $k) {
if (!array_key_exists($k, $node))
$node[$k] = array();
$node = &$node[$k];
}
$node[$lastKey] = $value;
}
return $result;
}

Answer 2

Combination of iteration and recursion. Could be simplified to just iterative.
$array = [
'player.name' => 'Joe',
'player.lastName' => 'Snow',
'team.name' => 'Stars',
'team.picture.name' => 'Joe Snow Profile',
'team.picture.file' => 'xxx.jpg'
];
$newArray = array ();
foreach($array as $key=> $value) {
$temp = array ();
$keys = array_reverse (explode('.', $key));
$temp[$keys[0]] = $value;
for ($i = 1; $i < count($keys); $i++) {
$temp[$keys[$i]] = $temp;
unset ($temp [$keys [$i -1]]);
}
$newArray = array_merge_recursive($newArray,$temp);
}
var_dump($newArray );

Answer 3

I received this question as a test, this is my answer:
<?php
function buildArray(&$newArray, $keys, $value)
{
if (sizeof($keys) == 0) {
return $value;
} else {
$key = array_shift($keys);
if (isset($newArray[$key])) {
$value = buildArray($newArray[$key], $keys, $value);
if (is_array($value)) {
$newArray[$key] += $value;
} else {
$newArray[$key] = $value;
}
$arr = $newArray;
} else {
$arr[$key] = buildArray($newArray, $keys, $value);
}
}
return $arr;
}
$arr = [
'player.name' => 'Joe',
'player.lastName' => 'Snow',
'team.name' => 'Stars',
'team.picture.name' => 'Joe Snow Profile',
'team.picture.file' => 'xxx.jpg',
];
$newArray = [];
foreach ($arr as $key => $value) {
$explodedKey = explode(".", $key);
$temp = buildArray($newArray, $explodedKey, $value);
$newArray = array_merge($temp, $newArray);
}
print_r($newArray);
?>

Answer 4

You could do it like this
$newArr = [];
for ($arr as $key => $val) {
$tmp = explode ('.', $key);
if (!array_key_exists ($tmp [0], $newArray){
$newArray [$tmp [0]] = [];
}
$newArray [$tmp [0]][$tmp [1]] = $val;
}
edit:
Damn didn't saw the third level in team.
Not very generic but should work for third level ;)
$newArr = [];
for ($arr as $key => $val) {
$tmp = explode ('.', $key);
if (!array_key_exists ($tmp [0], $newArray){
$newArray [$tmp [0]] = [];
}
if (count($tmp) > 2){
if (!array_key_exists ($tmp [1], $newArray[$tmp [0]]){
$newArray [$tmp [0]][$tmp[1]] = [];
}
$newArray [$tmp [0]][$tmp [1]][$tmp [2]] = $val;
} else {
$newArray [$tmp [0]][$tmp [1]] = $val;
}
}

Answer 5

I think you can use something like this, for converting 2d array to nested tree. But You'll have to play with parent_id
https://github.com/denis-cto/flat-array-to-nested-tree