YII2 - Save user ID to work with it on other pages - php

Question

I'm building a questionnaire site.
On this site the user enters his email to receive the result of his questionnaire. So this site has no authentication.
How do I store the user's email to the end of the questionnaire?
It is my User model:
<?php
namespace common\models;
use Yii;
use \yii\db\ActiveRecord;
// use yii\web\IdentityInterface;
/**
* This is the model class for table "user".
*
* #property int $id
* #property string $email
* #property string $name
* #property string $family
* #property string $major
* #property string $univercity
* #property int $education
* #property int $gender
* #property int $age
* #property int $income
* #property int $get_result
* #property int $created_at
*/
class User extends ActiveRecord
{
/**
* {#inheritdoc}
*/
public static function tableName()
{
return 'user';
}
/**
* {#inheritdoc}
*/
public function behaviors()
{
return [
// TimestampBehavior::className(),
];
}
/**
* {#inheritdoc}
*/
public function rules()
{
return [
[['email', 'created_at'], 'required'],
[['education', 'gender', 'age', 'income', 'get_result', 'created_at'], 'integer'],
[['email', 'name', 'family', 'major', 'univercity'], 'string', 'max' => 255],
[['email'], 'unique'],
];
}
/**
* {#inheritdoc}
*/
public function attributeLabels()
{
return [
'id' => 'ID',
'email' => 'Email',
'name' => 'Name',
'family' => 'Family',
'major' => 'Major',
'univercity' => 'Univercity',
'education' => 'Education',
'gender' => 'Gender',
'age' => 'Age',
'income' => 'Income',
'get_result' => 'Get Result',
'created_at' => 'Created At',
];
}
}

Answer 1

There are many ways of achieving that, it mostly depends on your logic under the hood.
One of the easiest is to use session.
First store the email in session:
\Yii::$app->session->set('questionnaire-email', $usersEmail);
Then, when you want to use it:
$email = \Yii::$app->session->get('questionnaire-email');