How to convert an array of arrays or objects to an associative array?

Question

I\'m used to perl\'s map() function where the callback can assign both the key and the value, thus creating an associative array where the input was a flat array. I\'m aware of

Answer 1

I had the exact same problem some days ago. It is not possible using array_map, but array_reduce does the trick.

$arr = array('a','b','c','d');
$assoc_arr = array_reduce($arr, function ($result, $item) {
    $result[$item] = (($item == 'a') || ($item == 'c')) ? 'yes' : 'no';
    return $result;
}, array());
var_dump($assoc_arr);

result:

array(4) { ["a"]=> string(3) "yes" ["b"]=> string(2) "no" ["c"]=> string(3) "yes" ["d"]=> string(2) "no" }