Compare two multidimensional key values & combine non duplicates - php

Question

I have two multidimensional arrays. I'm looping through both arrays, checking for certain values & creating a new array.
$full_cats array
Array
(
[0] => Array
(
[parent_cats] => Array
(
[id] => 384
[name] => Beers & Ales
[parent] => 0
)
)
[1] => Array
(
[parent_cats] => Array
(
[id] => 387
[name] => Wines
[parent] => 0
)
)
)
$sub_cats array
Array
(
[0] => Array
(
[sub_cats] => Array
(
[id] => 386
[name] => Ales
[parent] => 384
)
)
[1] => Array
(
[sub_cats] => Array
(
[id] => 385
[name] => Beers
[parent] => 384
)
)
[2] => Array
(
[sub_cats] => Array
(
[id] => 403
[name] => Red
[parent] => 387
)
)
)
I'm looping through both arrays to check if $sub_cat['sub_cats']['parent'] value is the same as the $full_cat['parent_cats']['id'] value. If this is true, both values are added to the $master_cats array.
$master_cats = array();
foreach ($sub_cats as $sub_cat) {
foreach ($full_cats as $full_cat) {
if( $sub_cat['sub_cats']['parent'] == $full_cat['parent_cats']['id'] ){
$master_cats[] = array(
"parent_cats" => array(
$full_cat['parent_cats'],
),
"sub_cats" => array(
$sub_cat['sub_cats'],
)
);
};
};
};
The $master_cats output -
Array
(
[0] => Array
(
[parent_cats] => Array
(
[0] => Array
(
[id] => 384
[name] => Beers & Ales
[parent] => 0
)
)
[sub_cats] => Array
(
[0] => Array
(
[id] => 386
[name] => Ales
[parent] => 384
)
)
)
[1] => Array
(
[parent_cats] => Array
(
[0] => Array
(
[id] => 384
[name] => Beers & Ales
[parent] => 0
)
)
[sub_cats] => Array
(
[0] => Array
(
[id] => 385
[name] => Beers
[parent] => 384
)
)
)
[2] => Array
(
[parent_cats] => Array
(
[0] => Array
(
[id] => 387
[name] => Wines
[parent] => 0
)
)
[sub_cats] => Array
(
[0] => Array
(
[id] => 403
[name] => Red
[parent] => 387
)
)
)
)
I'm having two issues with the $master_cats array.
1st problem - As you can see, index 0 & 1 have the same [parent_cats] values. I only want to add the [parent_cats] key/values if they dont already exist.
2nd Problem - the $master_cats array index 0 & 1, the sub_cats array, some values are different but both have the same [sub_cats][parent] => 384 so they belong in the same array index, eg 0.
Below is what I'm hoping to achieve with the $master_cats array from the foreach/loop above
Array
(
[0] => Array
(
[parent_cats] => Array
(
[0] => Array
(
[id] => 384 <-- Parent ID
[name] => Beers & Ales
[parent] => 0
)
)
[sub_cats] => Array
(
[0] => Array
(
[id] => 386
[name] => Ales
[parent] => 384 <-- belongs to [parent_cats][id]
)
[1] => array
(
[id] => 385
[name] => Beers
[parent] => 384 <-- belongs to [parent_cats][id]
)
)
)
[1] => Array
(
[parent_cats] => Array
(
[0] => Array
(
[id] => 387 <-- Parent ID
[name] => Wines
[parent] => 0
)
)
[sub_cats] => Array
(
[0] => Array
(
[id] => 403
[name] => Red
[parent] => 387 <-- belongs to [parent_cats][id]
)
)
)
)

Answer 1

Here's one way to go about it. Note: your array structures are a bit over-nested... but here's a solution for the given structure
$all = [];
$tmpsubs = [];
foreach ($full_cats as $parent) {
$tmp = ['parent_cats' => $parent['parent_cats'], 'sub_cats' => []];
foreach ($sub_cats as $sub) {
if ($sub['sub_cats']['parent'] == $parent['parent_cats']['id']) {
$tmp['sub_cats'][]=$sub['sub_cats'];
}
}
$all[] = $tmp;
}
print_r($all);
Example: https://3v4l.org/01oLF
Output:
Array
(
[0] => Array
(
[parent_cats] => Array
(
[id] => 384
[name] => Beers & Ales
[parent] => 0
)
[sub_cats] => Array
(
[0] => Array
(
[id] => 386
[name] => Ales
[parent] => 384
)
[1] => Array
(
[id] => 385
[name] => Beers
[parent] => 384
)
)
)
[1] => Array
(
[parent_cats] => Array
(
[id] => 387
[name] => Wines
[parent] => 0
)
[sub_cats] => Array
(
[0] => Array
(
[id] => 403
[name] => Red
[parent] => 387
)
)
)
)
Note: here's an example of simplifying your array structure (which would require changing the code in my answer, but ultimately might make your life a little easier)
$parent_cats= array(
array(
"id" => "384",
"name" => "Beers & Ales",
"parent" => "0"
),
array(
"id" => "387",
"name" => "Wines",
"parent" => "0"
));