PHP match values between 2 arrays not same key - php

Question

I have made researches and havent fount any solutions for this yet. So final thought is come to Stackoverflow and ask the question.
I have 2 array like below:
BigArray
Array
(
[0] => Array
(
[id] => 1
[category_name] => Accountancy
[category_name_vi] => Kế toán
[category_id] => 1
)
[1] => Array
(
[id] => 2
[category_name] => Armed forces
[category_name_vi] => Quân đội
[category_id] => 2
)
[2] => Array
(
[id] => 3
[category_name] => Admin & Secretarial
[category_name_vi] => Thư ký & Hành chính
[category_id] => 3
)
[3] => Array
(
[id] => 4
[category_name] => Banking & Finance
[category_name_vi] => Tài chính & Ngân hàng
[category_id] => 4
)
)
and SmallArray:
Array
(
[0] => Array
(
[id] => 7
[category_id] => 2
[jobseeker_id] => 1
)
[1] => Array
(
[id] => 8
[category_id] => 3
[jobseeker_id] => 1
)
)
Ok, now I wanted to match each category_id from SmallArray link with respectively category_name from BigArrayand the output I only need matched values between SmallArray and BigArraywhere category_id of SmallArray is key and category_name of BigArray is value like below:
Matched array:
Array
(
[0] => Array
(
[2] => Armed forces
)
[1] => Array
(
[3] => Admin & Secretarial
)
)
So far, I have tried array_intersect, 2 foreach loops but no luck. Any advise would be very appreciated :(
Thanks

Answer 1

This should do that:
foreach ($smallArray as $smallKey => $smallElement) {
foreach ($bigArray as $bigKey => $bigElement) {
if ($bigElement['id'] == $smallElement['category_id']) {
$smallArray[$smallKey] = array(
$bigElement['id'] => $bigElement['category_name'],
);
break; // for performance and no extra looping
}
}
}
After these loops, you have what you want in $smallArray.