Find arrays with duplicate value and compare their key

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PHP

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Hello, I would like to find arrays with same value of key EAN. If multiple records exist, I want to remove the record with lower value of key ProductCount.

For example I have an array. As you can see there are three records with thesame ean ($arr[0], $arr[1], $a[3]). After finding these records with the same ean I need to compare their values of key ProductCount and keep the record with the smallest value of ProductCount. Do you understand?

I would be thankful for any advice.

$arr =array( 
"0" => Array
    (
        "ean" => 6900532615069,
        "productPrice" => 1140,
        "productCount" => 5
    ),
"1" => Array
    (
        "ean" => 6900532615069,
        "productPrice" => 1140,
        "productCount" => 50
    ),
"2" => Array
    (
        "ean" => 6900535364122,
        "productPrice" => 1140,
        "productCount" => 50
    ),

"3" => Array
    (
        "ean" => 6900532615069,
        "productPrice" => 1140,
        "productCount" => 10,
    ));

So output should be

$arr =array( 
"0" => Array
    (
        "ean" => 6900532615069,
        "productPrice" => 1140,
        "productCount" => 5
    ),
"1" => Array
    (
        "ean" => 6900535364122,
        "productPrice" => 1140,
        "productCount" => 50
    ));

What I have tried:

I tried this and some modifications of this but without success. I am trying to do it for days :(

function removeduplicateKeys($data){

$_data = array();

foreach ($data as $v) {
  if (isset($_data[$v['ean']])) {
    // found duplicate
    continue;
  }
  // remember unique item
  $_data[$v['ean']] = $v;
}

$data = array_values($_data);
return $data;

}