I have an array like this:
0 => array:8 [▼
"_id" => MongoId {#266 ▶}
"name" => "New param"
"default" => "900"
"visibility" => "1"
"type" => 1
"only_numbers" => "1"
"value" => "900"
"available" => "1"
]
How to collapse this array into:
$arr["New param"] = "900";
Only as:
$arr = array(
$a["name"] => $a["value"]
);
It looks like your array is an element of another array (that's what 0 => at the top implies). So you need to index that containing array:
$arr[$a[0]['name']] = $a[0]['value'];
If you want to get all the elements of that other array, use a loop:
foreach ($a as $el) {
$arr[$el['name']] = $el['value'];
}
or you could do:
$arr = array_combine(array_column($a, 'name'), array_column($a, 'value'));
Related
I have a problem that has been stressing me out for weeks now and i cannot find a clean solution to it that does not involve recursion.
This is the problem:
Take a flat array of nested associative arrays and group this into one deeply nested object. The top level of this object will have its parent property as null.
This is my solution but i admit it is far from perfect. I am fairly certain this can be done in a single loop without any recursion, but for the life of me i cannot work it out!
//Example single fork
$data = array(
//Top of Tree
0 => array(
"name" => "A",
"parent" => null,
"id" => 1,
),
//B Branch
1 => array(
"name" => "B",
"parent" => "1",
"id" => 2,
),
2 => array(
"name" => "B1",
"parent" => "2",
"id" => 3,
),
3 => array(
"name" => "B2",
"parent" => "3",
"id" => 4,
),
4 => array(
"name" => "B3",
"parent" => "4",
"id" => 5,
),
//C Branch
5 => array(
"name" => "C",
"parent" => "1",
"id" => 6,
),
6 => array(
"name" => "C1",
"parent" => "6",
"id" => 7,
),
7 => array(
"name" => "C2",
"parent" => "7",
"id" => 8,
),
8 => array(
"name" => "C3",
"parent" => "8",
"id" => 9,
),
);
Actual anonymised example
array:7214 [▼
0 => array:3 [▼
"name" => ""
"parent" => null
"id" =>
]
1 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
2 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
3 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
4 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
5 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
6 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
7 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
8 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
9 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
10 => array:3 [▼
"name" => ""
"parent" =>
"id" =>
]
Another example deeper nesting
{
"name":"top",
"id":xxx,
"children":{
"second":{
"name":"second",
"id":xxx,
"children":{
"Third":{
"name":"third",
"id":xxx,
"children":{
"fourth":{
"name":"fourth",
"id":xxx
}
}
}
}
}
}
}
$originalLength = count($data);
$obj = [];
while ($originalLength > 0) {
foreach ($data as $item) {
$name = $item['name'];
$parent = $item['parent'];
$a = isset($obj[$name]) ? $obj[$name] : array('name' => $name, 'id'=>$item['id']);
if (($parent)) {
$path = get_nested_path($parent, $obj, array(['']));
try {
insertItem($obj, $path, $a);
} catch (Exception $e) {
continue;
//echo 'Caught exception: ', $e->getMessage(), "\n";
}
}
$obj[$name] = isset($obj[$name]) ? $obj[$name] : $a;
$originalLength--;
}
}
echo json_encode($obj['A']);
function get_nested_path($parent, $array, $id_path)
{
if (is_array($array) && count($array) > 0) {
foreach ($array as $key => $value) {
$temp_path = $id_path;
array_push($temp_path, $key);
if ($key == "id" && $value == $parent) {
array_shift($temp_path);
array_pop($temp_path);
return $temp_path;
}
if (is_array($value) && count($value) > 0) {
$res_path = get_nested_path(
$parent, $value, $temp_path);
if ($res_path != null) {
return $res_path;
}
}
}
}
return null;
}
function insertItem(&$array, $path, $toInsert)
{
$target = &$array;
foreach ($path as $key) {
if (array_key_exists($key, $target))
$target = &$target[$key];
else throw new Exception('Undefined path: ["' . implode('","', $path) . '"]');
}
$target['children'] = isset($target['children']) ? $target['children'] : [];
$target['children'][$toInsert['name']] = $toInsert;
return $target;
}
Here's my take on what I believe is the desired output:
function buildTree(array $items): ?array {
// Get a mapping of each item by ID, and pre-prepare the "children" property.
$idMap = [];
foreach ($items as $item) {
$idMap[$item['id']] = $item;
$idMap[$item['id']]['children'] = [];
}
// Store a reference to the treetop if we come across it.
$treeTop = null;
// Map items to their parents' children array.
foreach ($idMap as $id => $item) {
if ($item['parent'] && isset($idMap[intval($item['parent'])])) {
$parent = &$idMap[intval($item['parent'])];
$parent['children'][] = &$idMap[$id];
} else if ($item['parent'] === null) {
$treeTop = &$idMap[$id];
}
}
return $treeTop;
}
This does two array cycles, one to map up the data by ID, then one to assign children to parents. Some key elements to note:
The build of $idMap in the first loop also effectively copies the items here so we won't be affecting the original input array (Unless it already contained references).
Within the second loop, there's usage of & to use references to other items, otherwise by default PHP would effectively create a copy upon assignment since these are arrays (And PHP copies arrays on assignment unlike Objects in PHP or arrays in some other languages such as JavaScript). This allows us to effectively share the same array "item" across the structure.
This does not protect against bad input. It's possible that invalid mapping or circular references within the input data could cause problems, although our function should always just be performing two loops, so should at least not get caught in an infinite/exhaustive loop.
Am working on some set of PHP array. Am trying to loop through each of them and check
the array whose name is equal to Josw Acade. Am using a for loop but I get zero
after extracting the data. I want to store the data in an array.
Array
array:6 [
0 => array:4 [
"id" => 1
"name" => "Josw Acade"
"value" => "Unlimited"
"plan_type" => "Superior"
]
1 => array:4 [
"id" => 2
"name" => "Verbal"
"value" => "true"
"plan_type" => "Superior"
]
2 => array:4 [
"id" => 12
"name" => "Josw Acade"
"value" => "$1,500,00"
"plan_type" => "Classic"
]
3 => array:4 [
"id" => 13
"name" => "Leon"
"value" => "true"
"plan_type" => "Classic"
]
4 => array:4 [
"id" => 14
"name" => "One Time"
"value" => "true"
"plan_type" => "Classic"
]
5 => array:4 [
"id" => 15
"name" => "Deat"
"value" => "$25,000"
"plan_type" => "Classic"
]
6 => array:4 [
"id" => 23
"name" => "Josw Acade"
"value" => "$100,000"
"plan_type" => "Essential"
]
]
Logic
$Inst = [];
for($med = 0; $med < count($array); $med++){
if($med['name'] == "Josw Acade"){
$Inst = $med['value'];
}
}
dd($Inst);
Your variables is not corretly set in the for loop, you are setting $med = 0 and acessing $med as an array.
Use filter, that runs a condition on each element and returns the items that satisfy that condition.
array_filter($array, function ($item) {
return $item['name'] === 'Josw Acade';
});
In general you don't have to make old school arrays anymore, foreach does the same.
$results = [];
foreach($array as $item)
{
if ($item['name'] === 'Josw Acade') {
$results[] = $item['value'];
}
}
You can use array_filter with callback
$filtered = array_filter($array, function($v){ return $v['name'] == 'Josw Acade'})
print_r($filtered);
You are looping through array; so on each iteration to get values; you need to pass index value and you are missing that. You are using $med as index.
Here is code.
$Inst = [];
for($med = 0; $med < count($array); $med++){
if($array[$med]['name'] == "Josw Acade"){
$Inst[] = $array[$med]['value'];
}
}
there is many way to do this but according to me the best way to use array_filer()
array_filter($array, function ($item) {
return $item['name'] === 'Josw Acade';
});
This shouldn't be confusing me as much as it is but I am looking to turn this:
array:3 [▼
"subject" => array:2 [▼
0 => "math"
1 => "english"
]
"grade" => array:2 [▼
0 => "a"
1 => "b"
]
"received" => array:2 [▼
0 => "2017"
1 => "2016"
]
]
into this:
array:2 [▼
"0" => array:3 [▼
"subject" => "math"
"grade" => "a"
"received" => "2017"
]
"1" => array:3 [▼
"subject" => "english"
"grade" => "b"
"received" => "2016"
]
]
Tried looping through in a couple different ways but never seem to get the result I am looking for, any help would be much appreciated!
$keys = array_keys($array);
$result = array_map(
function (...$values) use ($keys) { return array_combine($keys, $values); },
...array_values($array)
);
Which is essentially this, but less repetitive:
array_map(
function ($subject, $grade, $received) {
return [
'subject' => $subject,
'grade' => $grade,
'received' => $received
];
},
$array['subject'],
$array['grade'],
$array['received']
)
See the manual for array_map and ... for more explanation.
simple Version:
$arr1 = array(...);
$arr2 = array();
foreach ($arr1 as $k => $v) {
foreach ($v as $x => $y) {
$arr2[$x][$k] = $y;
}
}
But you should add conditions, if the array element not exists, create it, or you may get Errors, depending on your PHP configuration.
I have array inside array:
{
"0" => array("key" => "code", "id" => "4", "value" => "yes"),
"1" => array("key" => "parameter", "id" => "4", "value" => "0"),
"2" => array("key" => "code", "id" => "5", "value" => "no"),
etc...
}
This is what I want to do: I want to have one dimension array in which key would be "id" and value would be "value". However, I need to filter out entries whose key is "parameters". So, in this example, the final array should look like this:
{
"4" => "yes",
"5" => "no"
}
I just can't seem to figure out how to do this. Could you please help me a bit? I tried writing this foreach inside foreach but I just can't wrap my head around how to filter data.
foreach ($settings AS $key => $value) {
$id = null;
$value = null;
foreach ($value AS $key2 => $value2) {
// No idea how to filter out uneccesary entries and save the correct ones
}
$finalArray[$id] = $value;
}
This should do it :
$finalArray = array();
foreach ($settings as $setting) {
if ($setting['key'] != 'parameter') {
$finalArray[$setting['id']] = $setting['value'];
}
}
Assuming all your entries have keys 'key', 'id' and 'value'.
use array_column and array_filter like this, if you want to filter more keys add them to out_keys array :
<?php
$array = [
["key" => "code", "id" => "4", "value" => "yes"],
["key" => "parameter", "id" => "4", "value" => "0"],
["key" => "code", "id" => "5", "value" => "no"]
];
$out_keys = ['parameter'];
$result = array_column(array_filter($array, function($item) use($out_keys) {
return !in_array($item['key'], $out_keys);
}), 'value', 'id');
echo "<pre>";
print_r($result);
output:
Array
(
[4] => yes
[5] => no
)
Assuming $data is your starting array, the code below will output what you want in $result
$result = [];
foreach(array_filter($data, function($el){return $el['key']!='parameter';}) as $el){
$result[$el['id']] = $el['value'];
}
Live demo
I have the following structure array:
array:6 [▼
"593a4331b25f428814000035" => array:8 [▶]
"593a4331b25f428814000036" => array:8 [▶]
"593a4331b25f428814000037" => array:8 [▶]
"593a4331b25f428814000038" => array:8 [▼
"_id" => MongoId {#238 ▶}
"object_id" => "593a4331b25f428814000034"
"parameter_id" => "59398f5ab25f424016000029"
"value" => "1"
"children" => []
"parent_id" => "593a4331b25f428814000037"
"type" => "2"
"prefix" => "object"
]
"593a4331b25f428814000039" => array:8 [▶]
"593a4331b25f42881400003a" => array:8 [▶]
]
As you can see 3-th element of array has parent 593a4331b25f428814000037, where identificator is element in the same array.
How to put this element 593a4331b25f428814000038 inside parent in children?
In result I need to get:
"593a4331b25f428814000037" => array:8 [▼
"_id" => MongoId {#238 ▶}
"object_id" => "593a4331b25f428814000034"
"parameter_id" => "59398f5ab25f424016000029"
"value" => "1"
"children" => [ 0 => array("_id" => MongoId {#238 ▶}
"object_id" => "593a4331b25f428814000034"
"parameter_id" => "59398f5ab25f424016000029"
"value" => "1"
"children" => []
"parent_id" => "593a4331b25f428814000037"
"type" => "2"
"prefix" => "object")]
"parent_id" => "593a4331b25f428814000037"
"type" => "2"
"prefix" => "object"
]
I tried this way:
public function recursion($data){
foreach ($data as $k => $value) {
if (is_array($value['children']) && count($value['children']) > 0) {
$list[$k] = $value;
$list[$k]["children"] = $this->getChildren($all, $value['children']);
} else {
$list[$k] = $value;
}
}
return $list;
}
private function getChildren($all, $childs)
{
$list = [];
foreach ($childs as $k => $child) {
if (is_array($all[$child]['children'])) {
$tmpArray = $all[$child];
$tmpArray['children'] = $this->getChildren($all, $all[$child]['children']);
} else {
$tmpArray = $all[$child];
}
$list[] = $tmpArray;
}
return $list;
}
But it works incorrect
You can use array_reduce like:
$array = array_reduce($myArray, function ($carry, $item) {
if (empty($item['parent_id'])) {
$carry[$item['object_id']] = $item;
} else {
$carry[$item['parent_id']]['children'][] = $item;
}
return $carry;
}, []);
var_dump($array);
In this example I supposed the parent_id is empty for those items which doesn't belong to a another item. You can change that with isset in case there is no parent_id key