Integrating Single sign on of codoforum in yii framework 1 - php

Question

I have just installed codoforum (https://codoforum.com)
and want to use this feature https://codoforum.com/documentation/implementing-codoforum-sso
which consist of integrating Single Sign on in my website.
The website I which to integrate the forum into it is using Yii 1 Framework, I am not familiar with it unfortunately.
Following the documentation of codoforum, I filled in the configuation form and enabled the SSO plugin, what I should do now is complete the file client.php here : https://github.com/evnix/codoforum-sso.
Especially those lines :
if (USER_IS_LOGGED_IN) {
$account['uid'] = USERID; //Your logged in user's userid
$account['name'] = USERNAME; //Your logged in user's username
$account['mail'] = EMAILID; //Your logged in user's email id
$account['avatar'] = ''; //not used as of now
}
I filled in those filled manually and it worked, It detects if I am already connected to yii1 website and connect me to the forum using the email I provided.
What I want now is to get those information using the session, I put the file clien.php in the root of my website mywebsite.com/client.php
I have done some research and I found that this method in siteController is responsible for logging :
public function actionLogin() {
$model = new LoginForm;
// if it is ajax validation request
if (isset($_POST['ajax']) && $_POST['ajax'] === 'login-form') {
echo CActiveForm::validate($model);
Yii::app()->end();
}
// collect user input data
if (isset($_POST['LoginForm'])) {
$model->attributes = $_POST['LoginForm'];
// validate user input and redirect to the previous page if valid
if ($model->validate() && $model->login()) {
if (Yii::app()->session['type'] == 1 ) {
$this->redirect(Yii::app()->homeUrl . 'administration/team');
}else if (Yii::app()->session['type'] == 2 ) {
$this->redirect(Yii::app()->homeUrl . 'agenda');
} else {
$this->redirect(Yii::app()->homeUrl);
}
}
}
// display the login form
$this->render('login', array('model' => $model));
}
I have tried to add this code :
session_start();
$_SESSION['username']=$model->username;
(after : if ($model->validate() && $model->login()))
and use $_Session in the file client.php but it didn't work.
The problem is that I have no idea how yii1 framework work, and it will take me sometime to be familiar with it, I know that there is session in Yii1, but I don't know how to use it and where to put the file client.php and how can I make it detect the Yii Session.
But if I can use the global session it would be better.
Thank you so much for your time and your answer.