How to make an array of selected list/menu items

I want to know how to make an array of the selected items from multiple select menus. I have an order form that looks like this. The product names have a quantity menu beside it,(assuming there is already a quantity menu until the last product name) I want to get the selected quantities and insert them to a ‘quantity’ field in the database separated by “,” just like what you do in checkboxes.

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my PHP so far. I only have the array for the checkboxes(product names). I don’t know how to make an array for the quantities/select menus.

[code=php]<?php

include (“dbinfo.php”);

if (isset($_POST[‘button’]))
{
$implode = implode(“,”,$_POST[‘CheckboxGroup’]);
mysql_query(“INSERT INTO order_form (orders) VALUES (‘”.$implode.”‘)”) ;
}
?>

<?php

if(isset($_POST[‘button’]))
{
$implode = implode(“,”,$_POST[‘CheckboxGroup’]);
mysql_query(“INSERT INTO order_form (name, address, contact_no, payment_option, claim_option, orders) VALUES (‘”.$_POST[‘name’].”‘, ‘”.$_POST[‘address’].”‘, ‘”.$_POST[‘contactno’].”‘, ‘”.$_POST[‘pay_option’].”‘, ‘”.$_POST[‘claim_option’].”‘, ‘”.$implode.”‘)”);
}
?>[/code]

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