Question

I have the following array which I would like to edit:

Array
(
    [qty_black_34] => 
    [qty_black_36] => 2
    [qty_black_38] => 
    [qty_black_40] => 
    [qty_black_42] => 
    [qty_black_44] => 
    [qty_black_48] => 
    [qty_powder_34] => 
    [qty_powder_36] => 
    [qty_powder_38] => 
    [qty_powder_40] => 
    [qty_powder_42] => 1
    [qty_powder_44] => 
    [qty_powder_48] => 
    [qty_red_34] => 
    [qty_red_36] => 
    [qty_red_38] => 2
    [qty_red_40] => 
    [qty_red_42] => 
    [qty_red_44] => 
    [qty_red_48] => )

What I want to do is to build another array to hold only the elements with a value.
The new array must look like this”

Array
    (
        [0] => Array
            (
                [color] => black
                [size] => 36
                [quantity] => 2
            )

        [1] => Array
            (
                [color] => powder
                [size] => 42
                [quantity] => 1
            )

        [2] => Array
            (
                [color] => red
                [size] => 38
                [quantity] => 2
            )

    )

PHP is the language I’m using.

Answer 1

loop through array and take elements, which have set a value. for the additional key/values in your final array split the string used as key in original array

$new_array = array();
foreach ($old_array as $key => value) {
    if ($value) {
        $key_split = explode('_', $key);
        $new_array[] = array('color' => $key_split[1], 'size' => $key_split[2], 'quantity' => $value);
    }
}