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#4 with
#9
Content
[...]
The easiest way to create a new validation rule is inside the model that is going to use it.
Let's say that you want to check if a user password is safe enough.
Usually you could achieve this result just by using the [CRegularExpressionValidator](http://www.yiiframework.com/doc/api/CRegularExpressionValidator) but for the sake of this guide let's pretend that validator does not exist.
first of all in your model class you'll have to add two constants
```php
const WEAK = 0;
const STRONG = 1;
```
then in your rules method you'll have to set the rule[...]
);
}
```
##Links
* Russian version [The PHP Times](http://phptime.ru/blog/yii/27.html)
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