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Sessions In PHP

Why one will have a session variable declared and what is session will be a basic question. Say, I want a variable with some value that will remain till my site is open on my browser. How would I accomplish that?

You have the option to store the value in the hidden field and each time you submit the form you have that value carried forwarded to another page, that is a very tiresome exercise, right?

Hmmm…... What is another way then? Store it in the session variable. The session is a piece of information stored when your application is open in the browser or you explicitly terminate the session. In the session you generally store a unique id of a user by that you can retrieve the entire information, but depending on the application there could be many more to add to this.

We will see an example in PHP of how you start the session and store the value in the session.

<?php
// this is compulsory statement if you want to access session variable in the page. This indicates that we are going to access session variables in this page
session_start();
// store session data
$_SESSION[‘userid’] = 1;
//retrieve session data
echo "Userid=" . $_SESSION[userid];
session_destroy(); // will reset your session and you will lose all your stored session data.

?>
This very basic use of session say now you want to change the value of session and want to check if the session exits.
<?php
session_start();
if (isset($_SESSION['views'])) $_SESSION['views'] = $_SESSION['views'] + 1;
else $_SESSION['views'] = 1;
echo "Views=" . $_SESSION['views'];
?>

Posted By -	Geetanjali

Posted On -	Friday, January 15, 2016

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