/**
* Get all array keys, looking even in arrays contained within the array.
* @param array $array
* @return array of keys
*/
function arrayKeysRecursive($array)
{
$keys = array();
foreach ($array as $key => $item) {
$keys[] = $key;
if (is_array($item) && !empty($item)) {
$keys = array_merge($keys, MyOOS_Utilities::arrayKeysRecursive($item));
}
}
return $keys;
}