* We add the icons based on these css names which are lower cased
* and only AlphaNumeric (+ _).
*
- * @param $key
+ * @param string $key
*
* @return string
*/
* We do a strotolower comparison as we don't know what case people might have if they
* are using a non-std one like dinersclub.
*
- * @param $key
+ * @param string $key
*
* Based on http://davidwalsh.name/validate-credit-cards
* See also https://en.wikipedia.org/wiki/Credit_card_numbers