User.php

<?php
class User extends CActiveRecord
{
    public $password2;
    ...
    public function rules()
    {
        return array(
            ...
            array('password', 'compare', 'compareAttribute'=>'password2', 'message'=>'{attribute} とパスワード(確認)が一致しません。', 'on'=>'register'),
            ...
        );
    }
    
    protected function beforeSave()
    {
        $ph = new PasswordHash(
            Yii::app()->params['iteration_count_log2'],
            Yii::app()->params['portable_hashes']
        );
    
        $this->password = $ph->HashPassword($this->password);
        ...     
        return parent::beforeSave();
    }
}