/**
* Take multi-dimensional array and return it as a single dimensional
* array.
*
* The keys from each of the 'sub' arrays, ie. the arrays at the
* lowest level of the multi array architecture, are preserved.
* The multi array argument can be any combination of any level
* of single or multi-dimensional arrays, or scalar elements.
* @param multi_array - a multi-dimensional array that needs to
* have all elements returned as a single
* array
*/
function flatten($multi_array)
{
$ret = array();
if (is_array($multi_array)) {
foreach ($multi_array as $key => $element) {
if (is_array($element)) {
$ret = ArrayUtility::merge($ret, ArrayUtility::singleDimensionArray($element));
} else {
$ret[$key] = $element;
}
}
} else {
$ret[] = $multi_array;
}
return $ret;
}
