Get the difference between two arrays in Laravel

Question

The $category variable will either hold values (i.e. tags) that are already available in the tags table, or the user can enter new tags in this variable , or both.

Following is the query that brings tags if they are available in the tags table:

$TagNames = DB::table('tags')
                    ->whereIn('t_name', $category)                  
                    ->pluck('t_name');

The output of TagNames :

array(2) { [0]=> string(7) "Zamalek" [1]=> string(4) "Ahly" }

Below is the $category variable that will hold all the tags, regardless they are new tags entered by the user, or existing ones.

$category = $request->get('catBox');

Output of $category (with two additional new tags) :

array(4) { [0]=> string(7) "Zamalek" [1]=> string(4) "Ahly" [2]=> string(5) "Gouna" [3]=> string(8) "Pyramids" }

The question is : How can I compare both arrays and get only the difference (i.e. "Gouna" and "pyramids" in this case) in a new array ?

Lijesh Shakya · Accepted Answer · 2019-08-09 04:09:29Z

10

If you need to retrieve only the differences from the $category.

You can use PHP inbuild function array_diff() function.

$differenceArray = array_diff($category, $TagNames);

Keep in mind that, it will not display the difference of $TagNames.

To retrieve all the difference, you can retrieve the first difference and second difference and use array_merge() function to merge it together.

$differenceArray1 = array_diff($category, $TagNames);
$differenceArray2 = array_diff($TagNames, $category);

$mergeDifference = array_merge($differenceArray1, $differenceArray2);

answered Aug 9, 2019 at 4:09

Lijesh Shakya

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Comments

Serghei Leonenco · Accepted Answer · 2019-08-09 04:11:59Z

4

You can use array_diff(A,B), it returns all elements from A, which are not elements of B (= A without B).

<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);
?>

Output of difference array1 from array2 is in this output:

Array
(
    [1] => blue
)

Hope it helps.

answered Aug 9, 2019 at 4:11

Serghei Leonenco

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Ankur · Accepted Answer · 2019-08-09 04:13:33Z

2

You can use php function named array_diff and it will return you non matching items by comparing values.

<?php
    $array1 = array(0=> 'Language', 1=>'Math', 2=>'Science', 3=>'Geography');
    $array2 = array(0=> 'Math', 1=>'Science', 2=>'History');
    $diff_result = array_diff($array1, $array2);
    print_r($diff_result);
?>

Output:

Array ( [0] => Language [3] => Geography)

Ref: https://www.w3resource.com/php/function-reference/array_diff.php

edited Aug 9, 2019 at 4:13

answered Aug 9, 2019 at 4:08

Ankur

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Luke Watts · Accepted Answer · 2023-01-06 16:06:49Z

0

Here's the Laravel way, for those that want to stick with Laravel helpers instead of array_diff for whatever reason.

Let's say you have collection 1 called $activeUserIds and collection 2 called $allUserIds and you want to find the inactive users IDs...

$inactiveUserIds = $activeUserIds->diff($allUserIds);

answered Jan 6, 2023 at 16:06

Luke Watts

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