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My longest post of the year..... (thank you in advance for scrolling 😀) Here is what my $_POST array looks like using print_r($_POST) Array ( [newQuantity77777] => 3 [newPrice77777] => 5.00 [usedQuantity77777] => 1 [usedPrice77777] => 3.99 [total77777] => 18.99 [newQuantity88888] => // sometimes empty [newPrice88888] => [usedQuantity88888] => 4 [usedPrice88888] => 12.00 [total88888] => 48.00 [newQuantity44444] => 2 [newPrice44444] => 4.00 [usedQuantity44444] => 0 [usedPrice44444] => 3.99 [total44444] => 8.00 // these values I don't need [date] => July 25 2021 // these values below I don't need [address] => 123 Anystreet Avenue [address2] => [zipcode] => 90210 [city] => Beverly Hills [state] => CA [planet] => Mars ) I've been trying to use that array to create a special "sub-array" for only the SKU numbers and just their new and used quantities and prices. DESIRED RESULT: Array ( [77777] => Array ( [newQuantity] => 3 [newPrice] => 5.00 [usedQuantity] => 1 [usedPrice] => 3.99 ) [88888] => Array ( [newQuantity] => 0 [newPrice] => 0 [usedQuantity] => 4 [usedPrice] => 12.00 ) [44444] => Array ( [newQuantity] => 2 [newPrice] => 4.00 [usedQuantity] => 0 [usedPrice] => 3.99 ) ) Knowing that my SKU numbers are always exactly 5 digits, and no other $_POST keys will ever have 5 digits, I've been able to accomplish this with horribly convoluted and unsatisfactory code like this: $sku = array(); foreach($_POST as $var => $val) { $number = substr($var,-5); if (preg_match("/\d{5}/",$sku)) { $sku[$number] = // the array keys will be the SKU numbers // then I keep looping to look for the string "newQuantity" // capture that value... and create little mini arrays // for my big multidimensional array..... Is there a better way to go about this? Thank you.