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Create your own Validation Rule

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Create your own Validation Rule

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How-tos

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validator, validation rules, model validation, create validator

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[...]
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
[...]
* check if the user password is strong enough
* check the password against the pattern requested
* by the strenghth parameter
* This is the 'passwordStrength' validator as declared in rules().
*/
[...]
In our rules method we used this rule on the password attribute, so the value of attribute inside our validation model will be **password**

In the rule we also setted an additional parameter named **strenghth**
the value of that parameter will be inside the $params array
[...]
);
}
```
 
 
##Links
 
* Russian version [The PHP Times](http://phptime.ru/blog/yii/27.html)
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Version: 1.1
Category: How-tos
Tags: create validator, model validation, validation rules, validator
Written by: nickcv
Last updated by: Gismo
Created on: Mar 31, 2011
Last updated: 12 years ago
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