This document discusses session, cookies, GET and POST methods in web development. It explains that HTTP is the communication protocol used to deliver web content. Sessions and cookies are used to store and retrieve user information across multiple requests. GET sends data via the URL query string, while POST encodes it in the message body. Sessions are more secure as cookies can be accessed directly, but both allow maintaining state on the server.

2. Sreyachandran.v
Sreta.chandran31@gmail.com
www.facebook.com/sreya
twitter.com/username
in.linkedin.com/in/profilename
Session, Cookies, GET and POST

3. 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

4. HTTP
 HTTP is an TCP/IP based communication protocol, which is
used to deliver data (HTML files, image files, query results
etc) on the World Wide Web.
 It provides a standardized way for computers to communicate
with each other.
 HTTP is stateless. The server and client are aware of each
other only during a current request.

5. Cookies
• Cookie are small text files that website can leave on visitors
hard disk.
• Common use of cookies are:
• Remembering user name.
• Maintaining shopping cart.
• Keeping track of previously viewed content.

8. Creating Cookie
setcookie(“UserId” , ”1008” , ”time()+3600”);
Cookie variable Name
Cookie variable value
Expiration time

9. Accessing cookie
<?php
// Print a cookie
echo $_COOKIE[“UserId"];
// A way to view all cookies
print_r($_COOKIE);
?>
• The PHP $_COOKIE variable is used to retrieve a cookie
value.

10. Destroying cookie
• There is no special method to destroy a cookie, we can achieve
it by setting the cookie time into a past time so that it destroy
it.
setcookie(“UserId” , ”1008” , ”time()-100”);

11. Sessions
• A PHP session variable is used to store information about, or
change settings for a user session.
• The session values by default expire when the browser is
closed.
• Technically , session are just a form of cookies with out an
expiration date.

12. Session
• Session can be started in two ways in php.
• By calling the session.auto_start configuration setting in “php.in”.
• Calling session_start() on beginning of each pages whenever you
use session.
• Creating and accessing session.
• Once the session is started you can create and access session variables like any
other array variables.
$_SESSION[‘UserId']=1008;

13. GET and POST
• There are two methods that we can send form data from client
to server.
• GET allows you to send data as part of the query string.That
means data will be appended with the url.
• POST method transfers information via HTTP message body
The information is encoded and put into message body called
QUERY_STRING.

14. GET
• The PHP provides $_GET associative array to access all the
sent information using GET method.
• GET can't be used to send binary data, like images or word
documents, to the server.
http://www.test.com/index.htm?name1=value1&name2=value2

15. POST
• The POST method can be used to send ASCII as well as binary
data.
• The PHP provides $_POST associative array to access all the
sent information using POST method.
<form method="post" action="registration.php">

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