change "callback" to "callable"

Author: sreichel

lib/Varien/Data/Collection/Filesystem.php

@@ -386,7 +386,7 @@ protected function _generateRow($filename)
      * @param string $field
      * @param mixed $value
      * @param string $type 'and'|'or'
-     * @param callback $callback
+     * @param callable $callback
      * @param bool $isInverted
      * @return $this
      */
@@ -440,7 +440,7 @@ protected function _filterRow($row)
      * Invokes specified callback
      * Skips, if there is no filtered key in the row
      *
-     * @param callback $callback
+     * @param callable $callback
      * @param array $callbackParams
      * @return bool
      */

lib/Varien/Object/Mapper.php

@@ -40,8 +40,8 @@ class Varien_Object_Mapper
      *     <Varien_Object> => $from->setData($key, <from>)
      *     array(<Varien_Object>, <method>) => $from->$method($key, <from>)
      *
-     * @param array|Varien_Object|callback $from
-     * @param array|Varien_Object|callback $to
+     * @param array|Varien_Object|callable $from
+     * @param array|Varien_Object|callable $to
      * @return array|Varien_Object
      */
     public static function &accumulateByMap($from, $to, array $map, array $defaults = [])