Learn PHP online:PHP Day-11

PHP : Cookies and Sessions

$_SESSION: By using this super global variable, we can read the values of sessions and also we can creat the sessions.

*Sessions resides in web server.

Difference between Cookies and Sessions:

· Cookies reside in client system.     · Cookies are unsecured.     · Cookies stores limited data of amount.     · Cookies can store only string data.     · Cookies are burden to the client system

·Resides in web server        · Highly secured        ·Sessions ca store huge amount of data        ·Sessions can store any type of data        ·Burden to web server.

*By default sessions will not initialize in temporary location. To initialize the sessions we use “sessions.auto_start” configuration directive. This directive is used to initialize the sessions  when he request is started.

*If you want to transform the sessions value from one page to another page with irrespective of session.auto_start. We have to use this function in the page.

Program:

   Page1.php

<?php
session_start();
$x=10;
$_SESSION['lan']="php";
echo $x;
echo $_SESSION['lan'];
?>
<a href="page2.php">got to </a>

Page2.php

<?php
session_start();
echo "value of x is".$x;
echo "value of session is".$_SESSION['lan'];

?>

Note: if we use “session.auto_start we can access the application else if we use session_start>we can success only page values.