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If you have any doubts with your PHP code please discuss it in the PHP Forum
Sessions in PHP
Sessions allow us to store information in the server for future use. A session starts once the visitor enters the site and ends once he leaves the site. If we want to store the data permanently we have to store in database.
For the websites, which ask for users to register and login, session variables are necessary to keep the information about the visitors.
For example after login, the visitor may be addressed like "Hi visitorname" in all the pages he visits in that session...
To use sessions in php we have to start the session in all pages in which we read/write session variables.
Syntax :
<?php session_start(); ?>
This session_start(); statement should be put before the <html> tag.
Writing A Session variable :
Example : <?php $_SESSION['userid'] = 'Worth2Read'; ?>
This creates a session variable userid.
Reading a session variable :
We can read the session variable in other pages. For example,
<?php echo "Hi ".$_SESSION['userid']; ?> will display
Hi Worth2Read
Deleting the Session variable :
When a user decides to Logout or Signout , the session variables associated with him need to be deleted.
<?php unset($_SESSION['userid']); ?> will delete the userid. The entire session can be deleted by using the
function
session_destroy();
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