Question

I have a array what I’m fetching with mysql query per row, each containing the same indexes and it looks as it follows

array(

    0=> array(
         'order_nr'=> 123,
         'order_date' => '2013-01-29 00:00:00',
         'prod_name' => 'prod_1',
         'prod_value' => 1200

       )

    1=> array(
         'order_nr'=> 123,
         'order_date' => '2013-01-29 00:00:00' ,
         'prod_name' => 'prod_2',
         'prod_value' => 2100
    )

)

I would like to merge theme and make the sum of prod_value and creating a new array on prod_name and at the end I would have singe array. How would I do this in php or what would be the best workaround in this case

array(
 'order_nr'=> 123,
 'order_date'=>'2013-01-29 00:00:00',
 'prod_name'=> array('prod_1', 'prod_2')
 'prod_value' => 3300

)

Answer 1

If the list of products doesn’t have to be an array you can use Mysql and aggregating functions. It would be something like this:

SELECT order_no, order_data, GROUP_CONCAT(prod_name SEPARATOR ',') as prod_name, 
    SUM(prod_value) as prod_val FROM Products WHERE ... GROUP BY order_no;

If you need the product names as arrays you can then explode the string:

explode(',', $row['prod_name']);