if ($result->num_rows > 0) {
                    while($row = $result->fetch_assoc()) {

                        $product[] = [
                            "ID" => $row["ID"],
                            "Name" => $row["Productname"],
                            "Price" => $row["Pricetag"],
                            "Supply" => $row["Productsupply"],
                            "Type" => $row["Producttype"],
                            "Tags" => $row["Tags"],
                            "Materials" => $row["Materials"],
                            "Date" => $row["Releasedate"],
                            "Description" => $row["Description"],
                            "isDigital" => $row["isDigital"],
                            "MainPhoto" => $row["MainPhoto"],
                            "Photo01" => $row["Productpic01"],
                            "Photo02" => $row["Productpic02"],
                            "Photo03" => $row["Productpic03"]
                        ];
                    }
                } else {
                    echo "0 results found. Please check database connection.";
                }

$Filterarray = array('Pluimstaart'); //Might filter on more keywords in future usage.
    $newArr = array();
    foreach ($product as $key => $value) {
        foreach ($value as $finalVal) {
            if(in_array($finalVal, $Filterarray)){ // check if available in filter array
                $newArr[$key]["ID"] = $value["ID"];
                $newArr[$key]["Name"] = $value["Name"];
                $newArr[$key]["Price"] = $value["Price"];
                $newArr[$key]["Supply"] = $value["Supply"];
                $newArr[$key]["Type"] = $value["Type"];
                //$newArr[$key][] = $finalVal;
            }
        }
    }

Array
(
    [1] => Array
        (
            [ID] => 1
            [Name] => Pluisje de Pluimstaart
            [Price] => 75
            [Supply] => 0
            [Type] => Pluimstaart
        )
    [5] => Array
        (
            [ID] => 69
            [Name] => Blizzard de Pluimstaart
            [Price] => 75
            [Supply] => 1
            [Type] => Pluimstaart
        )
)

Array
    (
        [0] => Array
            (
                [ID] => 1
                [Name] => Pluisje de Pluimstaart
                [Price] => 75
                [Supply] => 0
                [Type] => Pluimstaart
            )
        [1] => Array
            (
                [ID] => 69
                [Name] => Blizzard de Pluimstaart
                [Price] => 75
                [Supply] => 1
                [Type] => Pluimstaart
            )
    )