*
* @return array The array based on the IDs (empty in case there is no list)
*/
- public function expand(string $acl_string = null)
+ public function expand(string $acl_string = null): array
{
// In case there is no ID list, return empty array (=> no ACL set)
if (empty($acl_string)) {
* @param string|null $acl_string
* @return string
*/
- public function sanitize(string $acl_string = null)
+ public function sanitize(string $acl_string = null): string
{
if (empty($acl_string)) {
return '';
*
* @return string
*/
- function toString($permissions) {
+ function toString($permissions): string
+ {
$return = '';
if (is_array($permissions)) {
$item = $permissions;
+ } elseif (empty($permissions)) {
+ return '';
} else {
$item = explode(',', $permissions);
}