merge two arrays by specific fields - php

Question

I have an array that looks like
$firstArray
[0] => Array(
[ID] => 1
[Fruit] => Apple
[State] => Ohio
)
[1] => Array(
[ID] => 2
[Fruit] => Orange
[State] => Hawaii
)
[2] => Array(
[ID] => 3
[Fruit] => Orange
[State] => Vermont
)
And another array which looks like
$secondArray
[0] => Array(
[ID] => 1
[description] => This is sample description
[Price] => 20
)
[1] => Array(
[ID] => 1
[Fruit] => This is sample description 2
[Price] => 15
)
[2] => Array(
[ID] => 2
[Fruit] => This is the second description
[Price] => 100
)
[3] => Array(
[ID] => 2
[Fruit] => This is the second description 2
[Price] => 50
)
[4] => Array(
[ID] => 3
[Fruit] => This is the third description
[Price] => 99
)
I have used
$newArray = array_merge_recursive($firstArray, $secondArray);
This has only appended entries from the second array to the end of the first array ideally i would want the new array to look like this
[0] => Array(
[ID] => 1
[Fruit] => Apple
[State] => Ohio
[description]
Array(
[0] => This is sample description
[1] => This is sample description 2
)
[price]
Array(
[0] => 20
[1] => 15
)
[1] => Array(
[ID] => 1
[Fruit] => Apple
[State] => Ohio
[description]
Array(
[0] => This is the second description
[1] => This is the second description 2
)
[price]
Array(
[0] => 100
[1] => 50
)
Essentially the new array should be combined on the ID and create nested arrays from the second array.

Answer 1

See if this makes sense. https://iconoun.com/demo/temp_jumpman.php
<?php // demo/temp_jumpman.php
/**
* Dealing with PHP nested arrays
*
* https://stackoverflow.com/questions/45145282/merge-two-arrays-by-specific-fields
*/
error_reporting(E_ALL);
echo '<pre>';
// TEST DATA CREATED FROM THE POST AT STACK - ID, Fruit, State
$first = Array(
'0' => [
'ID' => '1',
'Fruit' => 'Apple',
'State' => 'Ohio',
],
'1' => [
'ID' => '2',
'Fruit' => 'Orange',
'State' => 'Hawaii',
],
'2' => [
'ID' => '3',
'Fruit' => 'Orange',
'State' => 'Vermont',
],
);
// TEST DATA CREATED FROM THE POST AT STACK - ID, description, Price
$second = Array(
'0' => [
'ID' => '1',
'description' => 'This is sample description',
'Price' => '20',
],
'1' => [
'ID' => '1',
'description' => 'This is sample description 2',
'Price' => '15',
],
'2' => [
'ID' => '2',
'description' => 'This is the second description',
'Price' => '100',
],
'3' => [
'ID' => '2',
'description' => 'This is the second description 2',
'Price' => '50',
],
'4' => [
'ID' => '3',
'description' => 'This is the third description',
'Price' => '99',
],
);
$out = [];
foreach ($first as $arr)
{
// PLACEHOLDERS FOR THE FOUND DATA FROM THE SECOND ARRAY
$arr['description'] = [];
$arr['Price'] = [];
$id = $arr['ID']; // THE ID WE WANT IN THE SECOND ARRAY
foreach ($second as $idp)
{
if ($idp['ID'] == $arr['ID'])
{
$arr['description'][] = $idp['description'];
$arr['Price'][] = $idp['Price'];
}
}
$out[] = $arr;
}
print_r($out);