How to pair up keys in an array?

Question

I have 2 separate arrays, one is just the id's the other is the percentage Id's: Array ( [0] => 3 [1] => 4 [2] => 5 [3] => 6 [4] => 7 }

Percent array: Array ( [0] => 28 [1] => 39 [2] => 17 [3] => 28 [4] => 23

So it would end up like: Array ( [0] => Array

  (
    [id] => 3
    [percent] => 28
   )

and so on for each of the pairs?

Answer 1

simply loop through the elements of the array (0..4) and add items to your new array.

(I'm not including sample code, because this sounds like a homework assignment!)

Answer 2

I don't think there's any builtin way to do that, so you'll have to utilize a loop such as..

$pairs = array();
for($i = 0, $len = count($ids); $i < $len; $i++) {
    $pair = array(
        'id' => $ids[$i],
        'percent' => $percents[$i]
    );

    $pairs[] = $pair;
}

Answer 3

AFAIK you can't do that in a trivial way, however you can do something like array_combine($ids, $percentages);

Answer 4

A good idea might be to use two loops to account for the case where the arrays don't have equal member counts like this:

$ids = array(...);
$percent = array(...);
$combined = array();
foreach($ids as $index => $id) {
    $combined[$index]['id'] = $id;
}
foreach($percent as $index => $percentage) {
    $combined[$index]['percent'] = $percentage;
}