CODEWITHSUNDEEP
phparraysobject
timo
timo

Reputation: 2169

How do I compare object values that are inside an array?

I have an array containing several objects.

$products = [
            {"id":"1","random":"sadasd","mergethis":"Ding"},
            {"id":"2","random":"assdfsadf","mergethis":"Ding"},
            {"id":"2","random":"assdfsadf","mergethis":"Flop"},
            {"id":"2","random":"assdfsadf","mergethis":"Bips"},
            {"id":"3","random":"sdfss","mergethis":"Flung"},
            {"id":"3","random":"sdfss","mergethis":"Rorg"},
            {"id":"4","random":"asdasdddaf","mergethis":"Shwung"}
            ]

I'm trying to iterate trough this array and when the id is allready present in the array, I want to add the value of mergethis with the first hit that has the same id, seperated with a comma, and then unset the object from the array.

So my expected outcome would become:

[
{"id":"1","random":"sadasd","mergethis":"Ding"},
{"id":"2","random":"assdfsadf","mergethis":"Ding,Flop,Bips"},
{"id":"3","random":"sdfss","mergethis":"Flung,Rorg"},
{"id":"4","random":"asdasdddaf","mergethis":"Shwung"}
]

I'm trying to iterate trough $products and compare the values but I'm stuck at comparing the value to a subvalue of the array in stead of to the entire array

foreach($products as $key => $value){
    if (in_array($value->id, $products)) {
        //Delete this item and add product_category comma sepereated to first item
        //unset($products[$key]);
    }
}

This obviously doesn't work because it compares the item to the entire array in stead of to the sub value id of the array item.

How do I go about getting my expected outcome?

Do I need to create a new array filled with the keys and id values of each array item and iterate trough that? Or is there an easier method to compare object values inside an array to each other?

Upvotes: 0

Views: 116

Answers (3)

Tuan Anh Hoang-Vu
Tuan Anh Hoang-Vu

Reputation: 1995

Hint: Use associative array with id as key and the whole product as value:

$results = array();
foreach ($products as $prod){
    if (array_key_exists($prod['id'], $results)){
        $results[$prod['id']]['mergethis'] .= ',' . $prod['mergethis'];
    } else {
        $results[$prod['id']] = $prod;
    }
}

Upvotes: 2

deceze
deceze

Reputation: 522250

$result = [];
foreach ($products as $value) {
    if (!isset($result[$value['id']])) {
        $value['mergethis'] = [$value['mergethis']];
        $result[$value['id']] = $value;
    } else {
        $result[$value['id']]['mergethis'][] = $value['mergethis'];
    }
}

This seems the most sensible. If you do need those arrays joined by commas into one string:

foreach ($result as &$value) {
    $value['mergethis'] = join(',', $value['mergethis'];
}

Upvotes: 1

swatkins
swatkins

Reputation: 13640

You're basically looking for a PHP implementation of pluck. Have a look at this gist for a PHP version.

$ids_array = array_pluck("id", $products); // get just he id values
$ids_array = array_unique($ids_array); // remove duplicates
foreach($products as $key => $value){
    if (in_array($value->id, $ids_array)) {
        //Delete this item and add product_category comma sepereated to first item
        //unset($products[$key]);
    }
}
function array_pluck ($toPluck, $arr) {
    return array_map(function ($item) use ($toPluck) {
        return $item[$toPluck];
    }, $arr); 
}

Upvotes: 0

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