Session in Yii application - php

Question

I want to learn sessions in Yii, thus I created a simple login form. Also I want to "set" session in this project.
My login action
public function actionLogin()
{
Yii::app()->session['userid'] = "value"; // where i should put line ??
$model=new LoginForm('login');
if(isset($_POST['ajax']) && $_POST['ajax']==='form-reg')
{
echo CActiveForm::validate($model);
Yii::app()->end();
}
if(isset($_POST['regist']))
{
$model->username=$_POST['istiad'];
$model->password=$_POST['parol'];
if($model->validate() && $model->login()) {
$this->redirect(array( 'update','id'=>$this->getIdByUsername($model->username ) ));
/* $this->render(
'update',array(
'model'=> $this->loadModelByUsername($model->username ) ) );*/
}
}
else
$this->redirect(Yii::app()->user->returnUrl);
}
logout action
public function actionLogout()
{
Yii::app()->user->logout();
unset(Yii::app()->session['userid']); // also this,
Yii::app()->session->clear(); // this
Yii::app()->session->destroy(); // and this line ??
$this->redirect(Yii::app()->homeUrl);
}
p.s: PLEASE EXPLAIN ME what is the userid in unset(Yii::app()->session['userid']); ? I couldn't understand (because I'm new in Yii). It's just only a variable or any attribute of the db table name?
I copied the lines from this topic.
Thanks. Best regards.

Answer 1

Set session after validation user name and password. Like here..
if($model->validate() && $model->login()) {
Yii::app()->session['userid'] = "value"; //here
$this->redirect(array( 'update','id'=>$this->getIdByUsername($model->username ) ));
}
unset destroys the specified variable.
unset(Yii::app()->session['userid']);
Here userid is session variable. It is destroyed.
Yii::app()->session->clear();
clear() is used to remove all sessions.
After clear(), you need to remove actual data from server using
Yii::app()->session->destroy();