static function flatten($array, $prefix = '')
{
if (is_array($array)) {
$result = array();
foreach ($array as $key => $value) {
$new_key = $prefix . (empty($prefix) ? '' : '_') . $key;
if (is_array($value) && Tools::is_assoc($value)) {
$result = array_merge($result, self::flatten($value, $new_key));
} else {
$result[$new_key] = $value;
}
}
return $result;
} else {
return $array;
}
}
