Group 2d array data by a column and apply default values where a date key is missing

I have an array that looks like this...

[
    ['code' => 'AS34', '2014-12-10' => 32],
    ['code' => 'AS34', '2014-12-11' => 42],
    ['code' => 'AS34', '2014-12-12' => 40],
    ['code' => 'AS34', '2014-12-15' => 44],
    ['code' => 'AH98', '2014-12-10' => 1],
    ['code' => 'AT78', '2014-12-12' => 1],
    ['code' => 'AL44', '2014-12-10' => 23],
    ['code' => 'AL44', '2014-12-11' => 27],
    ['code' => 'AL44', '2014-12-13' => 25],
    ['code' => 'AL44', '2014-12-15' => 26],
]

I am trying to turn it into an array that looks like this...

$example_data = array(
    array(
        'ID'       => 1,
        'code'     => 'AS34',
        '09/12/14' => '0',
        '10/12/14' => '32',
        '11/12/14' => '42',
        '12/12/14' => '40',
        '13/12/14' => '0',
        '14/12/14' => '0',
        '15/12/14' => '44',
    ),
    array(
        'ID'       => 2,
        'code'     => 'AH98',
        '09/12/14' => '0',
        '10/12/14' => '1',
        '11/12/14' => '0',
        '12/12/14' => '0',
        '13/12/14' => '0',
        '14/12/14' => '0',
        '15/12/14' => '0',
    ),
    array(
        'ID'       => 3,
        'code'     => 'AT78',
        '09/12/14' => '0',
        '10/12/14' => '0',
        '11/12/14' => '0',
        '12/12/14' => '1',
        '13/12/14' => '0',
        '14/12/14' => '0',
        '15/12/14' => '0',
    ),
    array(
        'ID'       => 4,
        'code'     => 'AL44',
        '09/12/14' => '0',
        '10/12/14' => '23',
        '11/12/14' => '27',
        '12/12/14' => '0',
        '13/12/14' => '25',
        '14/12/14' => '0',
        '15/12/14' => '26',
    ),
);

So basically it sets up an array for each 'code' and then the previous 7 days.

I figured this:

$data = Array
(
    0 => Array
        (
            "id" => 1,
            "code" => "AS34",
            "2014-12-10" => 32
        ),

    1 => Array
        (
            "id" => 1,
            "code" => "AS34",
            "2014-12-11" => 42
        ),

    2 => Array
        (
            "id" => 1,
            "code" => "AS34",
            "2014-12-12" => 40
        ),

    3 => Array
        (
            "id" => 1,
            "code" => "AS34",
            "2014-12-15" => 44
        ),

    4 => Array
        (
            "id" => 1,
            "code" => "AH98",
            "2014-12-10" => 1
        ),

    5 => Array
        (
            "id" => 1,
            "code" => "AT78",
            "2014-12-12" => 1
        ),

    6 => Array
        (
            "id" => 1,
            "code" => "AL44",
            "2014-12-10" => 23
        ),

    7 => Array
        (
            "id" => 1,
            "code" => "AL44",
            "2014-12-11" => 27
        ),

    8 => Array
        (
            "id" => 1,
            "code" => "AL44",
            "2014-12-13" => 25
        ),

    9 => Array
        (
            "id" => 1,
            "code" => "AL44",
            "2014-12-15" => 26
        )
);

function in_array_r($needle, $haystack, $strict = false) { //taken from http://stackoverflow.com/a/4128377/4263082

    foreach ($haystack as $item) {

        if (($strict ? $item === $needle : $item == $needle) || (is_array($item) && in_array_r($needle, $item, $strict))) {
            return true;
        }

    }

    return false;
}

$codes = Array();
$counter = -1;

foreach($data as $key => $value) {

    if(!in_array_r($data[$key]["code"], $codes, true)) {

        $codes[++$counter] = Array();

        foreach($data[$key] as $subkey => $subvalue) {$codes[$counter][$subkey] = $subvalue;}

    }
    else{

        foreach($data[$key] as $subkey => $subvalue) {

            if($subkey != "code" && $subkey != "id") {$codes[$counter][$subkey] = $subvalue;}

        }

    }

}

print_r($codes);

OUTPUT

Array
(
    [0] => Array
        (
            [id] => 1
            [code] => AS34
            [2014-12-10] => 32
            [2014-12-11] => 42
            [2014-12-12] => 40
            [2014-12-15] => 44
        )

    [1] => Array
        (
            [id] => 1
            [code] => AH98
            [2014-12-10] => 1
        )

    [2] => Array
        (
            [id] => 1
            [code] => AT78
            [2014-12-12] => 1
        )

    [3] => Array
        (
            [id] => 1
            [code] => AL44
            [2014-12-10] => 23
            [2014-12-11] => 27
            [2014-12-13] => 25
            [2014-12-15] => 26
        )

)