PHP multidimensional array: group repeated values and create "sub array" - php

Question

I have a array with repeated values like this:
[
[
'id' => 112,
'name' => 'John',
'country' => 'Spain',
'age' => 24,
'company' => 'One',
'price' => 10
],
[
'id' => 112,
'name' => 'John',
'country' => 'Spain',
'age' => 24,
'company' => 'Two',
'price' => 15
],
[
'id' => 112,
'name' => 'John',
'country' => 'Spain',
'age' => 24,
'company' => 'Three',
'price' => 20
],
[
'id' => 224,
'name' => 'Paul',
'country' => 'France',
'age' => 25,
'company' => 'One',
'price' => 25
],
[
'id' => 224,
'name' => 'Paul',
'country' => 'France',
'age' => 25,
'company' => 'Two',
'price' => 40
]
]
I need to group same id with name, country and age, and make a "sub array" companies with company and price
array (
112 =>
array (
'id' => 112,
'name' => 'John',
'country' => 'Spain',
'age' => 24,
'companies' =>
array (
0 =>
array (
'company' => 'One',
'price' => 10,
),
1 =>
array (
'company' => 'Two',
'price' => 15,
),
2 =>
array (
'company' => 'Three',
'price' => 20,
),
),
),
224 =>
array (
'id' => 224,
'name' => 'Paul',
'country' => 'France',
'age' => 25,
'companies' =>
array (
0 =>
array (
'company' => 'One',
'price' => 25,
),
1 =>
array (
'company' => 'Two',
'price' => 40,
),
),
),
)
I have tried this code without good results:
$new_array = array();
foreach ($my_array as $item) {
$new_array[$item['id']][] = $item;
$new_array[$item['id']]['companies'][] = $item;
}
Then I tried this:
$new_array = array();
foreach ($my_array as $item) {
$new_array[$item['id']]['temp'] = $item;
$new_array[$item['id']]['companies'][] = $item;
}
Works fine, but I get temp key that I don't want it. For example, with this code I need to access to id items with $new_array [$key]['temp']['id']
I can remove the temp key with another loop:
$final_array = array();
foreach ($new_array $key=>$item) {
$final_array [$key] = $item['temp'];
$final_array [$key]['temp'] = $item['companies'];
}
With this code I can access correctly to id with: $final_array[$key]['id']
Another option is this code:
foreach($array as $v) {
$result[$v['id']]['id'] = $v['id'];
$result[$v['id']]['name'] = $v['name'];
$result[$v['id']]['country'] = $v['country'];
$result[$v['id']]['age'] = $v['age'];
$result[$v['id']]['companies'][] = array('company' => $v['company'],
'price' => $v['price']);
}
But it is not very elegant if we had more keys (phone, email...)
Any ideas?

Answer 1

Nothing wrong with the code you've provided at the end, but here's some ideas for how to make it more tolerant to more array values (as you mentioned, phone, email, etc).
This uses the handy PHP array_diff_key function to remove the array elements you don't want from the "core" records. Then, applying array_diff_key to get those same array elements INTO the "company" records.
// set up the array of keys you don't want in the "original" record
$exclude = ['company' => FALSE, 'price' => FALSE];
// Your original loop
foreach($array as $v) {
// not strictly necessary, but helps readability
$id = $v['id'];
// Assign the "core" record all the values you want, excluding those defined above
// in this case, will remove "company" and "price"
$record = array_diff_key( $v, $exclude );
// only set this if not already set, otherwise wipes out previous companies
if ( ! isset($result[$id] ) ) {
$result[$id] = $record;
$result[$id]['companies'] = [];
}
// strip off the OTHER values from the array you don't want stored with the company
// this will automatically pick up the field NOT excluded above
// in this case, will remove all BUT "company" and "price"
$company = array_diff_key( $v, $record );
$result[$id]['companies'][] = $company;
}

Answer 2

One way to rome...
$collector=array();
foreach($array as $set){
//get a copy
$ref = $set;
//unset company data
unset($ref['company'],$ref['price']);
//make a refer
$r=$ref['id'];
//setup main data if not set before
if(!isset($collector[$r])){
$collector[$r]=$ref;
}
//collect company data
$collector[$r]['companies'][] = array('company'=>$set['company'],'price'=>$set['price']);
}
print_r($collector);

Answer 3

Similar to other answers:
$info = array (
array('id' => 112, 'name' => 'John', 'country' => 'Spain', 'age' => 24, 'company' => 'One', 'price' => 10),
array('id' => 112, 'name' => 'John', 'country' => 'Spain', 'age' => 24, 'company' => 'Two', 'price' => 15),
array('id' => 112, 'name' => 'John', 'country' => 'Spain', 'age' => 24, 'company' => 'Three', 'price' => 20),
array('id' => 224, 'name' => 'Paul', 'country' => 'France', 'age' => 25, 'company' => 'One', 'price' => 25),
array('id' => 224, 'name' => 'Paul', 'country' => 'France', 'age' => 25, 'company' => 'Two', 'price' => 40)
);
$grouped = array();
foreach ($info as $item) {
if (!isset($grouped[$item['id']])) {
$grouped[$item['id']] = $item;
}
$grouped[$item['id']]['companies'][] = array($item['company'],$item['price']);
unset($grouped[$item['id']]['company']);
unset($grouped[$item['id']]['price']);
}
print_r($grouped);

Answer 4

The sample data does not seem to require grouping by more than the id column.
The snippet below will extract/consume the last two elements in each row before pushing the first encountered row with a unique id, then it unconditionally pushes those two extracted rows into the group's companies subset.
Code: (Demo)
$result = [];
foreach ($array as $row) {
$companies = array_splice($row, -2);
$result[$row['id']] ??= $row;
$result[$row['id']]['companies'][] = $companies;
}
var_export($result);