Question

So I have my query, its returning results as expect all is swell, except today my designer through in a wrench. Which seems to be throwing me off my game a bit, maybe its cause Im to tired who knows, anyway..

I am to create a 3 tier array

primary category, sub category (which can have multiples per primary), and the item list per sub category which could be 1 to 100 items.

I’ve tried foreach, while, for loops. All typically starting with $final = array(); then the loop below that.

trying to build arrays like:

$final[$row['primary]][$row['sub']][] = $row['item]
$final[$row['primary]][$row['sub']] = $row['item]

I’ve tried defining them each as there own array to use array_push() on. And various other tactics and I am failing horribly. I need a fresh minded person to help me out here. From what type of loop would best suit my need to how I can construct my array(s) to build out according to plan.

The Desired outcome would be

array(
   primary = array
             (
                sub = array
                      (
                        itemA,
                        itemB,
                        itemC
                      ),
                sub = array
                      (
                        itemA,
                        itemB,
                        itemC
                      ),
             ),
   primary = array
             (
                sub = array
                      (
                        itemA,
                        itemB,
                        itemC
                      ),
                sub = array
                      (
                        itemA,
                        itemB,
                        itemC
                      ),
             ),
)

Answer 1

Something like this during treatment of your request :

if (!array_key_exists($row['primary'], $final)) {
    $final[$row['primary']] = array();
}
if (!array_key_exists($row['sub'], $final[$row['primary']])) {
    $final[$row['primary']][$row['sub']] = array();
}
$final[$row['primary']][$row['sub']][] = $row['item'];