Move array with same value inside the same array - php

Question

This is my array.
Array
(
[id] => 1
[color] => "White"
[something] => Array
(
[country] => "France"
[city] => "Paris"
)
)
Array
(
[id] => 2
[color] => "Black"
[something] => Array
(
[country] => "Germany"
[city] => "Berlin"
)
)
Array
(
[id] => 2
[color] => "Red"
[something] => Array
(
[country] => "Russia"
[city] => "Moscow"
)
)
I want to group arrays with same id value. This should be the output:
[0] => Array
(
[0] => Array
(
[id] => 1
[color] => "White"
[something] => Array
(
[country] => "France"
[city] => "Paris"
)
)
)
[1] => Array
(
[0] => Array
(
[id] => 2
[color] => "Black"
[something] => Array
(
[country] => "Germany"
[city] => "Berlin"
)
)
[1] => Array
(
[id] => 2
[color] => "Red"
[something] => Array
(
[country] => "Russia"
[city] => "Moscow"
)
)
)
I tried with tens of foreach statements but there's no way for me to get arrays with same id inside the same array. Is it probably related with the fact that it's a multidimensional array? Should I use 2 nested foreach to get the result?

Answer 1

Code:
<?php
$arr = array(
array(
'id' => 1,
'color' => 'white',
'something' => array(
'country' => 'France',
'city' => 'Paris',
),
),
array(
'id' => 2,
'color' => 'Black',
'something' => array(
'country' => 'Germany',
'city' => 'Berlin',
),
),
array(
'id' => 2,
'color' => 'Red',
'something' => array(
'country' => 'Russia',
'city' => 'Moscow',
),
),
);
function groupify($arr) {
$new = array();
foreach ($arr as $item) {
if (!isset($new[$item['id']])) {
$new[$item['id']] = array();
}
$new[$item['id']][] = $item;
}
return $new;
}
print_r(groupify($arr));
Result:
Array
(
[1] => Array
(
[0] => Array
(
[id] => 1
[color] => white
[something] => Array
(
[country] => France
[city] => Paris
)
)
)
[2] => Array
(
[0] => Array
(
[id] => 2
[color] => Black
[something] => Array
(
[country] => Germany
[city] => Berlin
)
)
[1] => Array
(
[id] => 2
[color] => Red
[something] => Array
(
[country] => Russia
[city] => Moscow
)
)
)
)
if you don't want to preserve keys, just call array_values before return.

Answer 2

Use id for key of new array.
$a[$array[id]][] = $array;

Answer 3

If you wanted to use a foreach:
<?php
$return = array();
foreach($array as $key => $innerArray) {
$return[$innerArray['id']][]= $innerArray;
}
Now $return contains them groped by ID, where keys 1 and 2 are your IDs
array(
1 => array(
array(/** **/)
),
2 => array(
array(/** **/),
array(/** **/)
);
);
You can then access your groups like this:
foreach($return as $key => $groupArray) {
// you have the groups here
foreach($groupArray as $id => $singleArray) {
// singleArray contains your id, colour etc
}
}
foreach($return[1] as $groupOne) {
// all arrays with id = 1
}