Fixed document for multisort in BaseArrayHelper

framework/helpers/BaseArrayHelper.php

@@ -401,7 +401,7 @@ class BaseArrayHelper
      * `SORT_REGULAR`, `SORT_NUMERIC`, `SORT_STRING`, `SORT_LOCALE_STRING`, `SORT_NATURAL` and `SORT_FLAG_CASE`.
      * Please refer to [PHP manual](http://php.net/manual/en/function.sort.php)
      * for more details. When sorting by multiple keys with different sort flags, use an array of sort flags.
-     * @throws InvalidParamException if the $descending or $sortFlag parameters do not have
+     * @throws InvalidParamException if the $direction or $sortFlag parameters do not have
      * correct number of elements as that of $key.
      */
     public static function multisort(&$array, $key, $direction = SORT_ASC, $sortFlag = SORT_REGULAR)
@@ -414,7 +414,7 @@ class BaseArrayHelper
         if (is_scalar($direction)) {
             $direction = array_fill(0, $n, $direction);
         } elseif (count($direction) !== $n) {
-            throw new InvalidParamException('The length of $descending parameter must be the same as that of $keys.');
+            throw new InvalidParamException('The length of $direction parameter must be the same as that of $keys.');
         }
         if (is_scalar($sortFlag)) {
             $sortFlag = array_fill(0, $n, $sortFlag);