RequirementHow-To use a special validation rule ----------- If you have a form, you sometimes need special validation Rules not included in Yii. Here i share a special rule with you, i just wrote. Maybe you have the case, when a user needs to Fill ou Field A oder the Fields B, C and D. ~~~
 
```php
public function thisOrThatRequired($attribute, $params) {
if ($params['check']) {}
}
~~~``` ~~~
 
```php public function rules() {         // NOTE: you should only define rules for those attributes that
 
        // will receive user inputs.
 
 
 
return array( .... array('firma', 'thisOrThatRequired', 'check' => 'vorname,nachname,anrede','on'=>'insert,rework'), ... } ~~~```