Session,cookies and get and post methods

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Session and cookies, GET and POST methods

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

content
•What are session and cookies
•How it works
•What are GET and POST methods
•examples

HTTP
•HTTP is a stateless protocol.
•Does not remember what happened between
two consecutive requests.
•Even two Requests made by same user are
different for HTTP.
•HTTP just processes a client REQUEST and supplies
the server RESPONSE.

What is
cookie ?
•Cookies are small piece of data
•Stored in the users computer.
•it stores info about you and your
preferences.

It is not limited to remember just our languages.
•It can contain time you visited a web site.
•Or items in your shopping cart
•Or even contain all the links your clicked.

Syntax and example
Syn:
Setcookie(name, value, expire, path, domain);
Ex:
setcookie("user", "Alex Porter", time()+3600);
click ME

To Read Cookie Values
$_COOKIE['CookieName'];
$_REQUEST['CookieName'];
To Destroy a cookie
setcookie("user", "", time()-3600);

•It is same like cookies
•But it stored in the server.
•Usually used for handle user info
about one session
•Default expire time is 24mnts
What is
session ?

Syntax and example
Syn:
session_start();
$_SESSION[‘name']=value;
Ex:
$_SESSION[‘userid']=100;

Accessing session variable
$_SESSION['views'];
Destroying a Session
unset($_SESSION[‘userid']);
session_destroy();
click Me

Why GET and POST methods?
These are two ways the browser client can send
info to the web server.

GET method
•It sends only limited amount of data.
•Info send using GET method will appear in
browser URL
•PHP provides $_GET associative array to access info.

example
<?php
if( $_GET["name"] || $_GET["age"] ) {
echo "Welcome ". $_GET['name']. "<br />";
echo "You are ". $_GET['age']. " years old.";
}
?>
<html>
<body>
<form action="<?php $_PHP_SELF ?>" method="GET">
Name: <input type="text" name="name" />
Age: <input type="text" name="age" />
<input type="submit" />
</form>
</body>
</html> clickME

POST method
• info sent by using POST method is not visible to
users.
•does not have any restriction on data size to be sent.
•PHP provides $_POST associative array to access

example
<?php
if( $_POST["yourname"] || $_POST["yourage"] )
{
echo "Welcome ". $_POST['yourname']. "<br />";
echo "You age is ". $_POST['yourage']. " years.";
exit();
}
?>
<html>
<body>
<form action="<?php $_PHP_SELF ?>" method="POST">
Your Name: <input type="text" name="yourname" />
Your Age: <input type="text" name="yourage" />
<input type="submit" />
</form>
</body>
</html> click ME

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Session,cookies and get and post methods

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