more docs for #10701

Author: cebe

docs/guide/db-active-record.md

@@ -440,7 +440,9 @@ If you are interested in the attribute values prior to their most recent modific
 > even if it has the same value but a different type. This is often the case when the model receives user input from
 > HTML forms where every value is represented as a string.
 > To ensure the correct type for e.g. integer values you may apply a [validation filter](input-validation.md#data-filtering):
-> `['attributeName', 'filter', 'filter' => 'intval']`.
+> `['attributeName', 'filter', 'filter' => 'intval']`. This works with all the typecasting functions of PHP like
+> [intval()](http://php.net/manual/en/function.intval.php), [floatval()](http://php.net/manual/en/function.floatval.php),
+> [boolval](http://php.net/manual/en/function.boolval.php), etc...
 
 ### Default Attribute Values <span id="default-attribute-values"></span>
 

docs/guide/input-validation.md

@@ -219,7 +219,7 @@ with a PHP callable. For example,
     }]
 ```
 
-> Note: Most validators do not handle empty inputs if their [[yii\base\Validator::skipOnEmpty]] property takes
+> Note: Most validators do not handle empty inputs if their [[yii\validators\Validator::skipOnEmpty]] property takes
   the default value true. They will simply be skipped during validation if their associated attributes receive empty
   inputs. Among the [core validators](tutorial-core-validators.md), only the `captcha`, `default`, `filter`,
   `required`, and `trim` validators will handle empty inputs.