PHP count items in a multi-dimensional array

Question

As you can see from the following array, there are three elements that appear on Nov 18, and another two elements that appear on Nov 22. Can someone tell me how I can retri

Answer 1

Here is my recursive variant:

$arr = array(
    '0' => array(
        '0' => array('2011-11-18 00:00:00' => 'C'),
        '1' => array('2011-11-18 00:00:00' => 'I'),
        '2' => array('2011-11-18 00:00:00' => 'S')
    ),
    '1' => array(
        '0' => array('2011-11-22 00:00:00' => 'C'),
        '1' => array('2011-11-22 00:00:00' => 'S')
    ),
    '2' => array(
        '0' => array(
            '0' => array('2011-11-22 00:00:00' => 'D')
        )
    )
);

function count_values($array, &$result = array(), $counter = 0)
{
    foreach ($array as $key => $data)
    {
        if (is_array($data))
        {
            count_values($data, $result, $counter);
        }
        else
        {
            array_key_exists($key, $result) ? $result[$key]++ : $result[$key] = 1;
        }
    }

    return $result;
}

print_r(count_values($arr));

This will return:

Array ( [2011-11-18 00:00:00] => 3 [2011-11-22 00:00:00] => 3 )