PHP array_merge overwrites itself

Question

I'm struggling with array_merge to make an array of items. The code which I have:

$items = [];
foreach ($products as $product) {
    Log::info($product->orderproduct->idorder_product);

    $items = array_merge($items, [
       'id'          => $product->orderproduct->idorder_product
    ]);
}
Log::info(print_r($items, true));

The output is:

6
7
['id' => 7]

How can I create an array with both id's?

$items[$id] = $product->orderproduct->idorder_product; should be sufficient if all your doing is populating an array keyed by ID? — Scuzzy
– Scuzzy, Commented Apr 3, 2019 at 7:12
You can only have one key called 'id'. In other words, each key must be unique. — KIKO Software
– KIKO Software, Commented Apr 3, 2019 at 7:14
According to the manual: If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. As an alternative to the answer below, using array_merge(), you would would have to merge [[ ... ]] instead of [ ... ]. — jeroen
– jeroen, Commented Apr 3, 2019 at 7:15
i think your problem is that you're using the index "id" and overwriting it each time in that loop. like people already suggested, use $items[] = ['id' => $product->orderproduct->idorder_product]; to create autoincrement numeric index for each array you're adding into $items. — yasoh
– yasoh, Commented Apr 3, 2019 at 7:16

u_mulder · Accepted Answer · 2019-04-03 07:12:36Z

4

Not sure what result you expect, so there are 2 options:

foreach ($products as $product) {
    Log::info($product->orderproduct->idorder_product);

    // First
    $items[] = $product->orderproduct->idorder_product;
    // Second
    $items[] = ['id' => $product->orderproduct->idorder_product];
}

answered Apr 3, 2019 at 7:12

u_mulder

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Comments

Mike · Accepted Answer · 2019-04-03 07:21:45Z

0

Array merge is just another array which add into the bottom of the array. I think you are misleading us on the result you want to get.

$items = array(); / $items = [];

you can push the data into array easily by this code

$items[] = array(
 'id' => $product->orderproduct->idorder_product,
)

answered Apr 3, 2019 at 7:21

Mike

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