Session handling in php

2. Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .
Ltd

3. Session Handling in Php
SWALIH T
swalihk321@gmail.com
www.facebook/ swalih321
twitter.com/swalih321
in.linkedin.com/in/swalih321
9539353663

4. Session
• A continuous period of access, unique to
each user that requests a PHP page from
a website

5. How do ‘Sessions’ work?
• Each user is assigned a unique number, or
session id, e.g.
• Session data is stored in a text file on the
server
– Filename is sess_sessionid
• Session data can be accessed through a
PHP superglobal, $_SESSION.

6. Starting or Resuming a Session
session_start();
• Must be called before any output to browser
• Must be called on every page that will participate
in the session
– If session_start() is not called, session data will not be
available
• No parameters
• No return value

7. Starting or Resuming a Session
session_start();
• PHP looks for a valid session id in the
$_COOKIE or $_GET superglobals
• If found, it loads the registered session
variables
• If none found, a new session id is created

8. Storing Session Data
• The $_SESSION superglobal array can be
used to store any session data.
$_SESSION['name'] = $name;
$_SESSION['age'] = $age;

9. Reading Session Data
• Data is simply read back from the
$_SESSION superglobal array.
$name = $_SESSION['name'];
$age = $_SESSION['age'];

10. Destroying a Session
Often not required, but if we want to
destroy a session:
// unset one session variable
unset($_SESSION[‘username’]);
// clear all session variables
$_SESSION = array();
// destroy session
session_destroy();

11. Try
• Navigate to login
• Login with username: bob, password: b123
• Copy/paste the URL to another tab in the same
browser
• Close the browser and reopen it. Does it
remember you?
• Paste the URL into another browser. What
happens

12. If this presentation helped you, please visit our
page facebook.com/baabtra and like it.
Thanks
www.baabtra.com | www.massbaab.com |www.baabte.com

13. Contact Us
Emarald Mall (Big Bazar Building)
Mavoor Road, Kozhikode,
Kerala, India.
Ph: + 91 – 495 40 25 550
NC Complex, Near Bus Stand
Mukkam, Kozhikode,
Kerala, India.
Ph: + 91 – 495 40 25 550
Start up Village
Eranakulam,
Kerala, India.
Email: info@baabtra.com