Question

I have an array that looks like this:

array(3) {
  [0]=>
  array(2) {
    [0]=>
    string(10) "2012-11-14"
    [1]=>
    string(5) "3238"
  }
  [1]=>
  array(2) {
    [0]=>
    string(10) "2012-11-13"
    [1]=>
    string(5) "3231"
  }
  [2]=>
  array(2) {
    [0]=>
    string(10) "2012-11-13"
    [1]=>
    string(5) "3231"
  }

I would like to write a foreach loop that would turn this array into:

array(2) {
  [0]=>
  array(1) {
    "2012-11-14" => "3238"
  }
  [1]=>
  array(1) {
   "2012-11-13" => "3231"
  }

So, basically, I would like to use the array element formatted as Y-M-D date as key to the second element in the array.

Answer 1

Given the following array…

$array = array(
    0 => array(0 => "2012-11-14", 1 => "3238"),
    1 => array(0 => "2012-11-13", 1 => "3231"),
    2 => array(0 => "2012-11-13", 1 => "3231"),
);

putting it into a new array like this:

$new_array = array();
foreach ($array as $key => $item)
{
    $new_array[$key][$item[0]] = $item[1];
}

print_r($new_array);

produces this output:

Array
(
[0] => Array
    (
        [2012-11-14] => 3238
    )

[1] => Array
    (
        [2012-11-13] => 3231
    )

[2] => Array
    (
        [2012-11-13] => 3231
    )

)

My answer doesn’t get rid of the duplicates, but the added dimension as specified in the original question means that duplicate dates as keys aren’t an issue.