I've been trying to get the difference between two collections:

1st:

{
    "name": "Test A",
    "scores": [
        {
            "name": "Values",
            "points": 9
        },
        {
            "name": "Algebra",
            "points": 6
        },
        {
            "name": "Science",
            "points": 5
        },
        {
            "name": "Total",
            "points": 20
        }
    ]
}

2nd:

{
    "name": "Test A",
    "scores": [
        {
            "name": "Values",
            "points": 5
        },
        {
            "name": "Algebra",
            "points": 8
        },
        {
            "name": "Total",
            "points": 13
        }
    ]
}

My goal is to create a new collection with the missing key and value pairs based on the first collection, retain its values and the missing key will have a value of 0. The output that I want to achieve is:

{
    "name": "Test A",
    "scores": [
        {
            "name": "Values",
            "points": 5
        },
        {
            "name": "Algebra",
            "points": 8
        },
        {
            "name": "Science",
            "points": 0
        },
        {
            "name": "Total",
            "points": 13
        }
    ]
}

Using the diffKeys method:

$collection_new = $collection_1['scores']->diffKeys($collection_2['scores']);
dd($collection_new->all());

This will result to:

{
    "4": {
        "name": "Total",
        "points": 20
    },
}

Need your awesome inputs. Thanks.

CodePudding user response：

The function down below should work, but the 1st array should contain all scores that the 2nd array has.

$first['scores'] = mergeScores();

function mergeScores()
{
     return array_map(
         fn ($x) => array_merge($x, getPoint($x['name'])), 
         $first['scores']
     );
}

function getPoint($name)
{
    $score = array_filter($second, fn ($x) => $x['name'] == $name);
    return ['point' => empty($score) ? 0 : $score['score']];
}