session and cookies ,get and post methods
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Sreya chandran.v
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Session, Cookies, GET and POST
Disclaimer: This presentation is prepared by trainees ofbaabtra as a part of mentoring program. This is not officialdocument of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
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.
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.
Creating Cookie
setcookie(“UserId” , ”1008” , ”time()+3600”);
Cookie variable Name
Cookie variable value
Expiration time
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.
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”);
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.
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;
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.
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
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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