* "admin foo" => array(NULL,"admin foo")
* "cms:admin foo" => array("cms", "admin foo")
*
- * @param $delim
+ * @param string $delim
* @param string $string
* E.g. "view all contacts". Syntax: "[prefix:]name".
- * @param null $defaultPrefix
+ * @param string|null $defaultPrefix
*
* @return array
* (0 => string|NULL $prefix, 1 => string $value)
* safe, standard data interchange formats such as JSON rather than PHP's
* serialization format when dealing with user input.
*
- * @param string|NULL $string
+ * @param string|null $string
*
* @return mixed
*/