In general, session refers to a frame of communication between two medium. A PHP session is used to store data on a server rather than the computer of the user. Session identifiers or SID is a unique number which is used to identify every user in a session based environment. The SID is used to link the user with his information on the server like posts, emails etc.
Starting a PHP Session
The first step is to start up a session. After a session is started, session variables can be created to store information.
The PHP session_start() function is used to begin a new session.It also creates a new session ID for the user.
Sample Code
<?php
session_start();
?>
Storing Session Data
Session data in key-value pairs using the $_SESSION[ ] superglobal array.The stored data can be accessed during lifetime of a session.
Data stored in sessions can be easily accessed by firstly calling session_start() and then by passing the corresponding key to the $_SESSION associative array.
Sample Code
<?php
session_start();
echo 'The Name of the student is :' . $_SESSION["Name"] . '<br>';
echo 'The Id of the student is :' . $_SESSION["Id"] . '<br>';
?>
Destroying Certain Session Data
To delete only a certain session data,the unset feature can be used with the corresponding session variable in the $_SESSION associative array.
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