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PS It would better to change line 6 above to $sku['products'][$id][$k] = $v;

Uploaded files are in $_FILES, not $_POST.

I would ... foreach ($array as $k => $v) { $id = substr($k, -5); if (ctype_digit($id)) { $len = strlen($k); $k = substr($k, 0, $len-5); $sku[$id][$k] = $v; } else $sku[$k] = $v; } echo '<pre>' . print_r($sku, 1) . '</pre>'; giving... Array ( [77777] => Array ( [newQuantity] => 3 [newPrice] => 5 [usedQuantity] => 1 [usedPrice] => 3.99 [total] => 18.99 ) [88888] => Array ( [newQuantity] => 0 [newPrice] => 0 [usedQuantity] => 4 [usedPrice] => 12 [total] => 48 ) [44444] => Array ( [newQuantity] => 2 [newPrice] => 4 [usedQuantity] => 0 [usedPrice] => 3.99 [total] => 8 ) [date] => July 25 2021 [address] => 123 Anystreet Avenue [address2] => [zipcode] => 90210 [city] => Beverly Hills [state] => CA [planet] => Mars )