generating an array out of another array by using a unique key - php

Question

I have an array that contains 3 products with attributes of "color" and "size" and the products are identified by a number ( ['code'] ).
My problem is that when i pull the data from the database I get this array that is in 6 pieces because "color" and "size" get stored in separate arrays.
My question is, how do I generate the data into an array of these 3 products with all their data in the same array.
Array(
[0] => Array
(
[code] => 123
[name] => box
[stock] => 2.00
[price] => 10.00
[color] => brown
)
[1] => Array
(
[code] => 123
[name] => box
[stock] => 2.00
[price] => 10.00
[size] => L
)
[2] => Array
(
[code] => 1234
[name] => box
[stock] => 3.00
[price] => 11.00
[color] => brown
)
[3] => Array
(
[code] => 1234
[name] => box
[stock] => 3.00
[price] => 11.00
[size] => XL
)
[4] => Array
(
[code] => 12345
[name] => box
[stock] => 4.00
[price] => 12.00
[size] => XL
)
[5] => Array
(
[code] => 12345
[name] => box
[stock] => 4.00
[price] => 12.00
[color] => gray
)
)
Expected output:
[0] => Array
(
[code] => 123
[name] => box
[stock] => 4.00
[price] => 12.00
[color] => gray
[size] => XL
)
What i'm looking to do is just combine the doubled array into one. Dont want to mess with SQL anymore - it gets attribute name in one table, attribute values from another table, code,stock,price from another table, name from another table. I know something can be done with just this array even if it will be just a temporary solution.

Answer 1

You can do this:
assuming your array is $products
$merged = array();
foreach($products as $product) {
if (!isset($sorted[$product['code']])) {
$merged[$product['code']] = $product;
} else {
$merged[$product['code']] = array_merge($sorted[$product['code']], $product);
}
}
Use the product code as array key and then merge the array.

Answer 2

If the two rows are always direct successors, with the first one holding the color field, while the latter holes the size field, you can make it easily by iterating over them in a for loop:
$maxCount = count($array);
for ($i = 1; $i < $maxCount; $i += 2) {
$array[$i - 1]['size'] = $array[$i]['size'];
unset($array[i]);
}
This will iterate over each second element of the array and add the size field to the preceding field.
If you need to have succeeding array keys afterwards you can call $arry = array_values($array);.
In case the the associated rows might not be successors you need to map them based on their code field (in case thats the primary key). You can use array_reduce() for that:
$desiredOutput = array_reduce($array, function($output, $element) {
if (!array_key_exists($element['code'], $output)) {
$output[$element['code']] = $element;
} elseif (array_key_exists('size', $element)) {
$output[$element['code']]['size'] = $element['size'];
} elseif (array_key_exists('color', $element)) {
$output[$element['code']]['color'] = $element['color'];
}
return $output;
}, []);