yii, some form validation examples

<?php

/**
 * This is the model class for table "users".
 *
 * The followings are the available columns in table 'users':
 * @property integer $user_id
 * @property string $user_name
 * @property string $user_password
 * @property string $user_email
 * @property string $user_gender
 * @property integer $user_age
 * @property string $user_location
 * @property string $user_avatar
 * @property string $user_facebook_id
 * @property integer $user_receive_newsletters_flag
 * @property integer $is_admin
 */
classUsersextends CActiveRecord
{
public$confirm_password, $user_captcha;
/**
  * Returns the static model of the specified AR class.
  * @return Users the static model class
  */
publicstaticfunctionmodel($className=__CLASS__)
 {
returnparent::model($className);
 }

/**
  * @return string the associated database table name
  */
publicfunctiontableName()
 {
return'users';
 }

/**
  * @return array validation rules for model attributes.
  */
publicfunctionrules()
 {
// NOTE: you should only define rules for those attributes that
// will receive user inputs.
returnarray(
array('user_name, user_password, user_email, user_gender, user_date_of_birth, user_location, user_facebook_id', 'required'),
array('user_age, user_receive_newsletters_flag, is_admin', 'numerical', 'integerOnly'=>true),
array('user_name, user_password, user_email, user_location, user_avatar', 'length', 'max'=>255),
array('user_gender', 'length', 'max'=>7),
array('user_facebook_id', 'length', 'max'=>100),
array('user_email', 'email', 'message'=>'Email address doesn\'t seem to be valid'),
array('user_email', 'unique', 'message'=>'This email is already registered.'),


array('user_password, confirm_password', 'required', 'on'=>'insert'),
array('user_password, confirm_password', 'length', 'min'=>6, 'max'=>40),
array('user_password', 'compare', 'compareAttribute'=>'confirm_password'),


array('user_date_of_birth', 'type', 'type'=>'date', 'message'=>'{attribute}: is not a date!', 'dateFormat'=>'yyyy-mm-dd'),

array('user_captcha', 'captcha', 'on'=>'insert', 'message'=>'The entered captcha is incorrect.'),


// The following rule is used by search().
// Please remove those attributes that should not be searched.
array('user_id, user_name, user_password, user_email, user_gender, user_age, user_location, user_avatar, user_facebook_id, user_receive_newsletters_flag, is_admin', 'safe', 'on'=>'search'),
  );
 }

/**
  * @return array relational rules.
  */
publicfunctionrelations()
 {
// NOTE: you may need to adjust the relation name and the related
// class name for the relations automatically generated below.
returnarray(
  );
 }

/**
  * @return array customized attribute labels (name=>label)
  */
publicfunctionattributeLabels()
 {
returnarray(
'user_id'=>'User',
'user_name'=>'Name',
'user_password'=>'Password',
'confirm_password'=>'Confirm Password',
'user_email'=>'Email',
'user_gender'=>'Gender',
'user_age'=>'Age',
'user_date_of_birth'=>'Date Of Birth',
'user_location'=>'Location',
'user_avatar'=>'Avatar',
'user_facebook_id'=>'Facebook',
'user_receive_newsletters_flag'=>'Receive Newsletters',
'is_admin'=>'Is Admin',
  );
 }

/**
  * Retrieves a list of models based on the current search/filter conditions.
  * @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
  */
publicfunctionsearch()
 {
// Warning: Please modify the following code to remove attributes that
// should not be searched.

$criteria=new CDbCriteria;

$criteria->compare('user_id',$this->user_id);
$criteria->compare('user_name',$this->user_name,true);
$criteria->compare('user_password',$this->user_password,true);
$criteria->compare('user_email',$this->user_email,true);
$criteria->compare('user_gender',$this->user_gender,true);
$criteria->compare('user_age',$this->user_age);
$criteria->compare('user_location',$this->user_location,true);
$criteria->compare('user_avatar',$this->user_avatar,true);
$criteria->compare('user_facebook_id',$this->user_facebook_id,true);
$criteria->compare('user_receive_newsletters_flag',$this->user_receive_newsletters_flag);
$criteria->compare('is_admin',$this->is_admin);

returnnew CActiveDataProvider($this, array(
'criteria'=>$criteria,
  ));
 }





}

?>