PHP, Laravel: Eliminate Specific Complex Array from JSON

Question

I'm currently developing an API using Laravel for my project, the concept:

1. Retrieve JSON data from MySQL.
2. Receive user input from the Front-end (string).
3. Convert both JSON and string input into an array with similar structure. The array structure here is basically ["ObjectA", "ObjectA_quantity", "ObjectB", "ObjectB_quantity", ...].
4. Basically, eliminate the quantity of every object of Database's Array, based on every object that User Input's Array got. For example, if the Database's Array got ["pizza", "1", "burger", "2"], and the User Input's Array got ["pizza", "1"], the output of the method is expected to be ["burger", "2"].

The method that I developed will give inconsistent and confusing output, like for some object, it works well, for other it doesn't eliminate anything and if the User Input's Array too big (> 1 object), it also doesn't eliminate anything. I really welcome different approach or anything else that will give the expected output as above. Thank you very much

Here's the source code of the method I've develop: (method's located on: else if ($transactionGetter->type == 'return'), Line 148 and so forth)

https://github.com/andre-nk23/packme-backend/blob/master/app/Http/Controllers/API/TransactionController.php

Answer 1

if it's a JSON you must decode the value before access

$transactionGetter=json_decode($transactionGetter);