The Session

Introduction

PHP brings a completed API to manage the session. However, Lion has his own session facade against the native PHP session by default.

One of the main advantages of ussing the Lion session facade is to isolate session instances between application contexts. The other one is to have a session space to store context instances without interfering with other containers.

Accessing the session

The session can be accessed by calling the __Context::getSession() method. i.e.:

<?php
 
    $session = __ApplicationContext::getInstance()->getSession();

The session exposes mainly the following methods:

• hasData (see __Session::hasData()): Check if some data is already stored in session
• getData (see __Session::getData()): Get data from the session
• setData (see __Session::setData()): Set data to the session
• removeData (see __Session::removeData()): Remove data from the session

i.e.

<?php
 
    //get the session:
    $session = __ApplicationContext::getInstance()->getSession();
    //if a data already exists in session
    if($session->hasData('data')) {
        //get data from session
        $data = $session->getData('data');
    }
    else {
        //retrieve data from database:
        $data = eg_retrieve_data_from_database();
        //store data to session once, so next time won't be needed to
        //get it from the database but from the session:
        $session->setData('data', $data);
    }