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

You can use array_walk_recursive() to get access to all of the leaf nodes in an array structure.

Something akin to this should work for you:

 'C'),
  array('2011-11-18 00:00:00' => 'I'),
  array('2011-11-18 00:00:00' => 'S')),
 array(
  array('2011-11-22 00:00:00' => 'C'),
  array('2011-11-22 00:00:00' => 'S')));

function countleafkeys($value, $key, $userData)
{
  echo "$key\n";
  if(!isset($userData[$key])) {
    $userData[$key] = 1;
  } else {
    $userData[$key]++;
  }
}

$result = array();
array_walk_recursive($data, 'countleafkeys', &$result);

print_r($result);

Outputs:

2011-11-18 00:00:00
2011-11-18 00:00:00
2011-11-18 00:00:00
2011-11-22 00:00:00
2011-11-22 00:00:00
Array
(
    [2011-11-18 00:00:00] => 3
    [2011-11-22 00:00:00] => 2
)