PHP Sessions

PHP / PHP Sessions

Session is a used to store single user information across multiple pages using session variables which are not stored on the users computer.

Start a PHP Session
A session is started with the session_start() function and session variables are set with the PHP global variable with $_SESSION. Write a program to store session information and retrieve it. Here PHP session session variables: Lang and LangType.

sessionstart.php()	Retrievesessioninfo.php
// Store Session Information <?php // Start the session session_start(); ?> <html> <body> <?php // Set session variables $_SESSION["Lang"] = "PHP"; $_SESSION["LangType"] = "ServerSide"; echo "Session variables are stored / set."; ?> </body> </html>	// Retrieve session info / variables <?php session_start(); ?> <html> <body> <?php // Echo session variables set on previous page echo " Language: " . $_SESSION["Lang"] . ".<br>"; echo " Language: " . $_SESSION["LangType "] . ".<br>"; ?> </body> </html>
Output Session variables are stored / set.	Output Language: PHP. Language: ServerSide.

Program	Output
//Other way to retrieve session information <?php session_start(); ?> <html> <body> <?php print_r($_SESSION); ?> </body> </html>	Output Array ( [Language] => PHP [Type] => Server Side [Lang] => PHP [serversidelang] => Server Side [LangType] => ServerSide )

Destroy a PHP Session
To remove all session information use session_unset(); , session_destroy(); functions.

Function Name	Purpose
session_unset();	remove all session information / variables
session_destroy();	destroy the session

Program	Output
<?php session_start(); ?> <html> <body> <?php session_unset(); session_destroy(); ?> </body> </html>	All Sessions are destroyed.

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