This slide contains some basics information about cookie and session in PHP

1. COOKIE AND SESSION IN PHP
By: Aashish Ghale
aashish.ghale@gmail.com

2. COOKIES
Like variable
 Stores single piece of data
under a unique name
 Browser dependent


stores cookies on user‟s browser
Moves page to page
 Avoids the problem to log in every time
 Always stored as text


3. COOKIES WITH PHP

Set cookie
setcookie() stores data in cookies
 Syntax: setcookie(“cookie name”,”value”);
 Accepts an optional third argument



E.g: setcookie(„username‟, „aacssh‟, time()+(60 * 60));


Sets the expiration date of the cookie
Sets expiration date 1 hour (60sec * 60min) from the current
time
Retrieve cookie

using super global using $_COOKIE
 E.g:
$_COOKIE[„cookie name‟];

4. (CONT…)
 Delete
cookie
Set
expiration date to time in the past
Syntax:
 setcookie(„username‟,‟aacssh‟, time()-3600);

Set time in the past

5. SESSION
Time spend by user at web application
 Stores small piece of data on server
 More secure and more reliable
 Automatically destroyed by shutting down the
browser
 Stored in session variable


6. SESSION WITH PHP

Starting session
 Started by function session_start()
Allow data to store in session variables
 Should be the first line of code


End session
 Close session with session_destroy()

7. (CONT…)

Session variables
 Set session variable with super global $_SESSION
 Once created , gets stored on the server
 E.g: $_SESSION[„variable‟] = value;
 Variable = name of session

Delete session variables manually
 Not
automatically deleted when session is destroyed
 Set $_SESSION superglobal to an empty array
 E.g: $_SESSION = array();

8. HOW PHP SESSION WORKS

9. USING BOTH SESSION AND COOKIE

Sessions have short life

Cookie can last forever


Long enough to outlast a session
If session uses cookie to remember session id

Cookie id is name after the session


i.e session_name()
To close session, cookie must also be deleted

10. SOMETHING MORE…..

Header function
Tells the server to send a new page
 Syntax: header(“Location: URL”);


11. CODE SNAPSHOTS :
1.
Combining session and cookie
1.
Creates session and cookie

12. CONTD…

session.php file

Separate file that is required in every php file.

13. CONTD

Logout.php

Destroies sessions and cookies

14. Lets make a simple login system