This document discusses session handling in PHP. It explains that a session is a unique period of access for each user requesting a PHP page from a website. Each user is assigned a unique session ID and session data is stored in text files on the server. The $_SESSION superglobal variable can be used to store and access session data. Session_start() must be called on each page to make session variables available. Session data remains until the session is destroyed or expires.

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
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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

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