how to compare arrays for additions and subtractions in php?

Question

I have two arrays:

$currentArr = ['apples','oranges','pears'];

$newArr = ['apples','oranges','pears', 'grapes'];

I need to formulate logic that will:

a) check the $newArr against the $currentArr and tell me what was REMOVED and what was ADDED

b) push the removed values onto a new separate array and push the added values onto a new separate array

as I am not extremely well versed in PHP, is this possible? if so, how can I do so?

Answer 1

array_diff() is what you need:

Returns an array containing all the entries from array1 that are not present in any of the other arrays.

<?php

$currentArr = ['apples','oranges','pears','test'];
$newArr = ['apples','oranges','pears', 'grapes'];

$removed = array_diff($currentArr, $newArr);
print_r($removed);
// output: 
// Array ( [3] => test )

// switch the order to get the added items:
$added = array_diff($newArr, $currentArr);
print_r($added);
// output:
// Array ( [3] => grapes )