bpolaszek / string-combinations

src/NoDuplicateLettersStringCombinations.php

Doc Comments +3 added lines

@@ -49,6 +49,9 @@
         return array_sum(array_map('array_product', $arr));
     }
 
+    /**
+     * @param integer $length
+     */
     private function permute(array $charset, $length = null)
     {
         $n = count($charset);