Combine varied number of dynamically named arrays - php

Question

I have seen the following: array_merge() How can I add a 'range' of an array name and the answers don't work for me.
I have an array that I am looping through in order to slice and convert certain currency strings to float numbers. I then have to array_merge them back together in order to work with the array and have been dynamically naming them so that I don't overwrite the previous array_merge. After doing so, I then need to combine all of the dynamically named arrays into one array.
Initially I had the following code, which worked great when I only had 3 nested arrays in the $order['product'] array. However, this number varies, and the code needs to do so as well.
$nr = 1;
foreach ($order['product'] as $product) {
$product_total = array_slice($product, 1);
array_walk($product_total, "convertCurrencyStringtoNumber");
${"final_product" . $nr} = array_merge($product, $product_total);
$nr++;
};
$arrays = array($final_product1, $final_product2, $final_product3);
var_dump($arrays);
This results in the following array:
array(3) {
[0]=> array(2) {
["source_code"]=> string(10) "408000-025"
["total"]=> float(18) }
[1]=> array(2) {
["source_code"]=> string(10) "408000-025"
["total"]=> float(17) }
[2]=> array(2) {
["source_code"]=> string(10) "408000-025"
["total"]=> float(2.75) } }
How do I implement a varied number of dynamically named arrays in the line:
$arrays = array($final_product1, $final_product2, $final_product3);
I attempted the following, but the array is nested incorrectly. Feel free to fix this code or come up with a better solution.
$nr = 1;
$i = 1;
foreach ($order['product'] as $product) {
$product_total = array_slice($product, 1);
array_walk($product_total, "convertCurrencyStringtoNumber");
${"final_product" . $nr} = array_merge($product, $product_total);
if ($nr > 0) {
$arrays = $final_product1;
for ($i = 2; $i <= $nr; $i++) {
$arrays = array_merge($arrays, ${"final_product" . $nr});
}
} else {
echo "There are no products in this order";
}
$nr++;
};
var_dump($arrays);
This results in the incorrectly nested array:
array(2) {
[0]=> array(2) {
[0]=> array(2) {
["source_code"]=> string(10) "408000-025"
["total"]=> float(18) }
[1]=> array(2) {
["source_code"]=> string(10) "408000-025"
["total"]=> float(17) } }
[1]=> array(2) {
["source_code"]=> string(10) "408000-025"
["total"]=> float(2.75) } }

Answer 1

Simply replace your dynamically single-named variables with an array:
$final_product = array();
foreach ($order['product'] as $product) {
$product_total = array_slice($product, 1);
array_walk($product_total, "convertCurrencyStringtoNumber");
$final_product[] = array_merge($product, $product_total);
};
var_dump($final_product);

Answer 2

Unless I'm missing something here... this should be as easy and simple as:
$final_array=[];
foreach ($order['product'] as $product) {
$final_array[]['total'] = (float) $product['whatever value 1 is...'];
$final_array[]['source_code'] = $product['source_code'];
}
var_dump($final_array);
If you need to apply convertCurrencyStringtoNumberbecause it does something weird to the variable then changethe seccond line to:
$final_array[]['total'] = convertCurrencyStringtoNumber(array_slice($product, 1));