Removing entire array elements if an element in a sub array already exists in another element

Question

I have a multidimensional array, consisting of products. Each sub-array has a product type. The productType is is in an array inside the Product array, such that;

 0 => product [
  productType [
  id: 2
  ]
 ]
 1 => product [
  productType [
  id: 1
  ]
 ]
 2 => product [
  productType [
  id: 2
  ]
 ]
]

I need to remove an entire array element, if the id already exists, in this example, I would need to remove EITHER array[0] or array[2], it doesn't matter as I only need the productType[id] to populate the box.

I have made a loop that creates an array of the ID's that already exist, but it involves making 2 new arrays:

    //This works but seems a bit inefficient
    $productFinal = [];
    $ids = [];
    foreach ($products as $product) {
        if (!in_array($product->getproductType()->getid(), $ids)) {
            $productFinal[] = $product;
        }
        $ids[] = $product->getproductType()->getid();
    }

I get the results I want, however I am sure that there is a more efficient way to do this, ideally using an inbuilt php function.

Please show a proper example array, preferable already as copy&paste-able PHP code. 0 => product [ doesn’t seem to make much sense, you either have a numeric key, or a string one. — 04FS
– 04FS, Commented Jan 30, 2019 at 8:59
You obviously select all products from database, but instead you should select distinct productTypes from products table. — u_mulder
– u_mulder, Commented Jan 30, 2019 at 9:01

Gerriet · Accepted Answer · 2019-01-30 09:01:14Z

0

If you also get the key of each element, you could remove the element if necessary inside the foreach-loop:

$ids = [];
foreach ($products as $key => $product {
   $id = $product->getproductType()->getid();
   if (in_array($id, $ids)) {
      unset($product[$key];
   } else {
      $ids[] = $id;
   }
}

answered Jan 30, 2019 at 9:01

Gerriet

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1 Comment

Twisterr1000 Over a year ago

Thanks, I this seems to work well and means I do not have as many variables. Thank you :)

Andreas · Accepted Answer · 2019-01-30 09:11:08Z

-1

There is no need for a loop, you can use array_column to make the array associative, which will remove any duplicates.
Then use array_values to make the array indexed again.

$arr = array_values(array_column($arr, Null, "id"));

answered Jan 30, 2019 at 9:11

Andreas

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3 Comments

splash58 Over a year ago

I think it will not work such a way with some levels of objects

Andreas Over a year ago

@splash58 it has worked every time I have tried it. Maybe there is some arrays it won't work on, but I have not come across any yet.

splash58 Over a year ago

if I undestand the structure right - sandbox.onlinephpfunctions.com/code/…

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