PHP merge arrays by value and merge it's sub arrays - php

Question

I thought I have some understanding of arrays. But it looks like I have no understanding. Or my head don't want to work. I have arrays:
[0] => Array
(
[key] => Person 1
[values] => Array
(
[0] => Array
(
[0] => 1436821440000,12
)
)
)
[1] => Array
(
[key] => Person 2
[values] => Array
(
[0] => Array
(
[0] => 1437562620000,24
)
)
)
[2] => Array
(
[key] => Person 3
[values] => Array
(
[0] => Array
(
[0] => 1437080040000,10
)
)
)
[3] => Array
(
[key] => Person 1
[values] => Array
(
[0] => Array
(
[0] => 1437082860000,1
)
)
)
[4] => Array
(
[key] => Person 3
[values] => Array
(
[0] => Array
(
[0] => 1437081840000,9
)
)
)
And here is what I want to achieve:
[0] => Array
(
[key] => Person 1
[values] => Array
(
[0] => Array
(
[0] => 1436821440000,12
[1] => 1437082860000,1
)
)
)
[1] => Array
(
[key] => Person 2
[values] => Array
(
[0] => Array
(
[0] => 1437562620000,24
)
)
)
[2] => Array
(
[key] => Person 3
[values] => Array
(
[0] => Array
(
[0] => 1437080040000,10
[1] => 1437081840000,9
)
)
)
How could I remove duplicates and merge data?

Answer 1

The sample input doesn't offer any variation in the data contained in the deept subarrays, so I'll demonstrate the utility of my snippet by adding a little more complexity in the data.
Effectively, each time a new key is encountered, you declare a new row containing the key element and a values element with an empty array. To identify that key as "encountered", the new row is assigned to the result array using the key value as the first level key.
Now that the values subarray is guaranteed to be declared, an inner loop will comb through the deeper arrays and push one or more (all) deep values into the respective values subarray -- in a flat fashion.
Code: (Demo)
$array = [
['key' => 'Person 1', 'values' => [['1436821440000,12']]],
['key' => 'Person 2', 'values' => [['1437562620000,24']]],
['key' => 'Person 3', 'values' => [['1437080040000,10']]],
['key' => 'Person 1', 'values' => [['1437082860000,1'], ['1437082860000,2', '1437082860000,3']]],
['key' => 'Person 3', 'values' => [['1437081840000,9']]],
];
$result = [];
foreach ($array as $row) {
if (!isset($result[$row['key']])) {
$result[$row['key']] = ['key' => $row['key'], 'values' => []];
}
foreach ($row['values'] as $values) {
array_push($result[$row['key']]['values'], ...$values);
}
}
var_export(
array_values($result)
);
Output:
array (
0 =>
array (
'key' => 'Person 1',
'values' =>
array (
0 => '1436821440000,12',
1 => '1437082860000,1',
2 => '1437082860000,2',
3 => '1437082860000,3',
),
),
1 =>
array (
'key' => 'Person 2',
'values' =>
array (
0 => '1437562620000,24',
),
),
2 =>
array (
'key' => 'Person 3',
'values' =>
array (
0 => '1437080040000,10',
1 => '1437081840000,9',
),
),
)

Answer 2

$result_arr = array();
foreach ($arr as $sub_arr)
{
$result_arr = array_merge($result_arr, $sub_arr);
$result_arr = array_unique($result_arr);
}