Session,cookies and get and post methods

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MIDHUN SUDHAKAR

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Session and cookies , GET and POST methods

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

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.

For example.

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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