PHP Array function to compare and merge values - php

Question

Appreciate your time!
After reviewing several 'Compare and Merge' threads, finally, I am going to request someone to help with this very specific scenario.
$input = array(
[ 2616 ] => array(
[ 9878767654 ] => array(
[ 987987987 ] => 987987987,
[ 987987986 ] => 987987986,
),
),
[ 2618 ] => array(
[ 9878767654 ] => array(
[ 987987987 ] => 987987987,
),
),
[ 'tmp-9878767654' ] => array(
[ 9878767654 ] => array(
[ 987987985 ] => 987987985,
[ 987987987 ] => 987987987,
),
),
[ 'tmp-9878767655' ] => array(
[ 9878767655 ] => array(
[ 987987975 ] => 987987975,
),
),
);
$desired_output = array(
[ 2616 ] => array(
[ 9878767654 ] => array(
[ 987987987 ] => 987987987,
[ 987987986 ] => 987987986,
[ 987987985 ] => 987987985,
),
),
[ 2618 ] => array(
[ 9878767654 ] => array(
[ 987987987 ] => 987987987,
[ 987987986 ] => 987987986,
[ 987987985 ] => 987987985,
),
),
[ 'tmp-9878767655' ] => array(
[ 9878767655 ] => array(
[ 987987975 ] => 987987975,
),
),
);
This is the inventory of products (listed by Product ID and Model ID) by Store ID. I want to merge the Model ID values WHERE the product id is the same FROM the array with store-ID starting with 'tmp-'. If product ID is not matched then I want that array to stay as it is. I hope I am making some sense.
Please help.

Answer 1

Here is a snippet to solve the specific problem posed by your example:
$temporaryStores = [];
$prefix = 'tmp-';
$prefixLength = strlen($prefix);
// extract the temporary store structures
foreach ($input as $storeId => $store) {
if (is_string($storeId) && strpos($storeId, $prefix) === 0) {
$productId = (int) substr($storeId, $prefixLength);
$temporaryStores[$productId] = $store;
unset($input[$storeId]);
}
}
// merge matching temporary store structures into the actual ones
$mergedProductIds = [];
foreach ($temporaryStores as $temporaryProductId => $temporaryModels) {
$temporaryModels = reset($temporaryModels); // Incompatible array structure
foreach ($input as $storeId => $store) {
foreach ($store as $productId => $models) {
if ($productId === $temporaryProductId) {
$modelsIds = array_merge($temporaryModels, $models);
$modelsIds = array_unique($modelsIds);
$input[$storeId][$productId] = $modelsIds;
$mergedProductIds[] = $temporaryProductId;
unset($temporaryStores[$temporaryProductId]);
}
}
}
}
// append leftover temporary store structures to the result
foreach ($temporaryStores as $temporaryProductId => $temporaryModels) {
if (!in_array($temporaryProductId, $mergedProductIds, true)) {
$input[$prefix . $temporaryProductId] = $temporaryModels;
}
}
var_dump($input);
This snippet might work for you or not. Either way, I strongly suggest you refactor this code into using a more object oriented design. Where it is made obvious what each value/structure represents, and validation can occur in isolation.
Now you are left having to deal with incompatible array structures that visually look like an incomprehensible mess.