How to add merge subarrays of two multi-dimensional arrays - php

Question

Sorry about such an easy question but I am new to PHP.
I am trying to add the isInStock keys and values from this array:
$stock array:
Array
(
[0] => Array
(
[name] => name of item 1
[price] => 45.00
[colour] => Neon yellow
[image] => http://images1
[url] => http://url1
[productid] => 7985894
[variants] => Array
(
[0] => Array
(
[variantId] => 7986029
[isInStock] => 1
)
[1] => Array
(
[variantId] => 7986070
[isInStock] => 1
)
[2] => Array
(
[variantId] => 7985916
[isInStock] => 1
)
[3] => Array
(
[variantId] => 7985929
[isInStock] => 1
)
[4] => Array
(
[variantId] => 7985918
[isInStock] => 1
)
[5] => Array
(
[variantId] => 7985935
[isInStock] => 1
)
[6] => Array
(
[variantId] => 7985945
[isInStock] => 1
)
[7] => Array
(
[variantId] => 7985994
[isInStock] => 1
)
)
[productId] => 7985894
)
[1] => Array
(
[name] => name of item 2
[price] => 45.00
[colour] => Multi
[image] => http://images
[url] => http://url
[productid] => 8040851
[variants] => Array
(
[0] => Array
(
[variantId] => 8040898
[isInStock] => 1
)
[1] => Array
(
[variantId] => 8041115
[isInStock] => 1
)
[2] => Array
(
[variantId] => 8040904
[isInStock] => 1
)
[3] => Array
(
[variantId] => 8041132
[isInStock] => 1
)
[4] => Array
(
[variantId] => 8041015
[isInStock] => 1
)
[5] => Array
(
[variantId] => 8040942
[isInStock] => 1
)
[6] => Array
(
[variantId] => 8040954
[isInStock] => 1
)
[7] => Array
(
[variantId] => 8040990
[isInStock] => 1
)
)
[productId] => 8040851
)
and put them in this array under each size according to the variantId value if they both match.
$data array:
Array
(
[0] => Array
(
[name] => name 1
[price] => 45.00
[colour] => Neon yellow
[image] => http://url
[url] => http://url1
[productid] => 7985894
[variants] => Array
(
[0] => Array
(
[variantId] => 7986029
[size] => US 0
)
[1] => Array
(
[variantId] => 7986070
[size] => US 2
)
[2] => Array
(
[variantId] => 7985916
[size] => US 4
)
[3] => Array
(
[variantId] => 7985929
[size] => US 6
)
[4] => Array
(
[variantId] => 7985918
[size] => US 8
)
[5] => Array
(
[variantId] => 7985935
[size] => US 10
)
[6] => Array
(
[variantId] => 7985945
[size] => US 12
)
[7] => Array
(
[variantId] => 7985994
[size] => US 14
)
)
)
[1] => Array
(
[name] => name 1
[price] => 45.00
[colour] => Multi
[image] => http://url
[url] => http://url
[productid] => 8040851
[variants] => Array
(
[0] => Array
(
[variantId] => 8040898
[size] => US 0
)
[1] => Array
(
[variantId] => 8041115
[size] => US 2
)
[2] => Array
(
[variantId] => 8040904
[size] => US 4
)
[3] => Array
(
[variantId] => 8041132
[size] => US 6
)
[4] => Array
(
[variantId] => 8041015
[size] => US 8
)
[5] => Array
(
[variantId] => 8040942
[size] => US 10
)
[6] => Array
(
[variantId] => 8040954
[size] => US 12
)
[7] => Array
(
[variantId] => 8040990
[size] => US 14
)
)
)
I have been trying to solve this for a while now, but I keep getting stuck. I can assign individual values but can't get it to do the whole array. Any help would be appreciated.
I would like my resulting array to be like this:
Array
(
[0] => Array
(
[name] => name 1
[price] => 45.00
[colour] => Neon yellow
[image] => http://url
[url] => http://url1
[productid] => 7985894
[variants] => Array
(
[0] => Array
(
[variantId] => 7986029
[size] => US 0
[isInStock] => 1
)
[1] => Array
(
[variantId] => 7986070
[size] => US 2
[isInStock] => 1
)
[2] => Array
(
[variantId] => 7985916
[size] => US 4
[isInStock] => 1
)
[3] => Array
(
[variantId] => 7985929
[size] => US 6
[isInStock] => 1
)
[4] => Array
(
[variantId] => 7985918
[size] => US 8
[isInStock] => 1
)
[5] => Array
(
[variantId] => 7985935
[size] => US 10
[isInStock] => 1
)
[6] => Array
(
[variantId] => 7985945
[size] => US 12
[isInStock] => 1
)
[7] => Array
(
[variantId] => 7985994
[size] => US 14
[isInStock] => 1
)
)
)
[1] => Array
(
[name] => name 1
[price] => 45.00
[colour] => Multi
[image] => http://url
[url] => http://url
[productid] => 8040851
[variants] => Array
(
[0] => Array
(
[variantId] => 8040898
[size] => US 0
[isInStock] => 1
)
[1] => Array
(
[variantId] => 8041115
[size] => US 2
[isInStock] => 1
)
[2] => Array
(
[variantId] => 8040904
[size] => US 4
[isInStock] => 1
)
[3] => Array
(
[variantId] => 8041132
[size] => US 6
[isInStock] => 1
)
[4] => Array
(
[variantId] => 8041015
[size] => US 8
[isInStock] => 1
)
[5] => Array
(
[variantId] => 8040942
[size] => US 10
[isInStock] => 1
)
[6] => Array
(
[variantId] => 8040954
[size] => US 12
[isInStock] => 1
)
[7] => Array
(
[variantId] => 8040990
[size] => US 14
[isInStock] => 1
)
)
)
So far I have tried array_merge which doesn't put the values in the right place.
I have tried this $data['isInstock'] = $stock[0]['variants'][0]['variantId']; which also won't work.

Answer 1

Sadly, it takes a fair amount of iterating/preparation to get your two arrays ready for use with array_merge_recursive(). I'll admit, I'm not proud of the convolution in my method. The major factor in all this is that array_merge_recursive() only "plays nicely" with non-numeric indexes, so I had to replace your numerically indexed keys with relative id values within the arrays. I'll do my best to explain my steps, but again, it's not pretty... (Demo)
Step #1: Prepare $stock array:
foreach($stock as $subarray){
$new_stock["#{$subarray['productid']}"]=$subarray; // replace outer key
$new_variants=[]; // declare a fresh array
foreach($subarray['variants'] as $varsub){
$new_variants["#{$varsub['variantId']}"]['isInStock']=$varsub['isInStock']; // one element only
// omitting variantId element this time as the next array will offer it.
}
$new_stock["#{$subarray['productid']}"]['variants']=$new_variants;
}
Step #2: Prepare $data array & merge:
foreach($data as $subarray){
$new_data["#{$subarray['productid']}"]=$subarray; // replace outer key
$new_variants=[]; // declare a fresh array
foreach($subarray['variants'] as $varsub){
$new_variants["#{$varsub['variantId']}"]=$varsub; // both elements from variants
}
$new_data["#{$subarray['productid']}"]['variants']=array_values(array_merge_recursive($new_variants,$new_stock["#{$subarray['productid']}"]['variants']));
// new variants subarray has been merged, re-indexed, and written to $new_data
}
Step #3: re-index outer array keys, and display:
$result=array_values($new_data);
var_export($result);
The bulk of the array preparations is to generate unique id's for the outer and inner arrays (in both $stock & $data). This permits the array_merge to isolate the related productids and recursively merge the variant elements.
If these two arrays are being generated from a database, then my high recommendation is to utilize available database functionality to merge this data instead of php.
For a simple example of how array_merge_recursive() works here's a small demo. Experiment with the keys in either of the arrays. If you so-much-as remove the # from the numeric string, array_merge_recursive() will assume that it's dealing with numeric indexes and mince things up. My technique to preserve your id's as strings was to prepend the #, but it could have been done by adding any of a range of non-digit characters to the key value.