How to merge array on behalf of a key value - php

Question

I have an array
{
Array
(
[0] => Array
(
[filterType] => checkbox
[sfid] => a1d1I000000jrmwQAA
[name] => Publication Year
[specValues] => Array
(
[count] => 3
[value] => 1953
)
)
[1] => Array
(
[filterType] => checkbox
[sfid] => a1d1I000000jrmwQAA
[name] => Publication Year
[specValues] => Array
(
[count] => 1
[value] => 1954
)
)
)
}
But I want to merge array if sfid is same i.e i want result
{
Array
(
[0] => Array
(
[filterType] => checkbox
[sfid] => a1d1I000000jrmwQAA
[name] => Publication Year
[specValues] => Array(
[0] =>array(
[count] => 3
[value] => 1953
)
[1] =>array(
[count] => 1
[value] => 1954
)
)
)
)
}

Answer 1

You just need to iterate your array and add the row to the output if it is not in there already (you can use sfid as keys) and add specValues to the correct row.
<?php
$input = [
[
'filterType' => 'checkbox',
'sfid' => 'a1d1I000000jrmwQAA',
'name' => 'Publication Year',
'specValues' => [
'count' => 3,
'value' => 1953,
],
],
[
'filterType' => 'checkbox',
'sfid' => 'a1d1I000000jrmwQAA',
'name' => 'Publication Year',
'specValues' => [
'count' => 1,
'value' => 1954,
],
],
];
$data = [];
foreach ($input as $row) {
if (!isset($data[$row['sfid']])) {
$data[$row['sfid']] = [
'filterType' => $row['filterType'],
'sfid' => $row['sfid'],
'name' => $row['name'],
'specValues' => [],
];
}
$data[$row['sfid']]['specValues'][] = $row['specValues'];
}
var_dump(array_values($data));
Output:
array(1) {
[0]=>
array(4) {
["filterType"]=>
string(8) "checkbox"
["sfid"]=>
string(18) "a1d1I000000jrmwQAA"
["name"]=>
string(16) "Publication Year"
["specValues"]=>
array(2) {
[0]=>
array(2) {
["count"]=>
int(3)
["value"]=>
int(1953)
}
[1]=>
array(2) {
["count"]=>
int(1)
["value"]=>
int(1954)
}
}
}
}
I assume that if sfid is the same, then also filterType and name is the same.