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PHP sessions allow developers to create variable that can be used throughout the entire user session. Instead of passing variable data around and risk loosing it, you can simply define a session variable and all your pages will be able to access that variable.

To use session variables in a page, it has to have the following statement at the top right after session_start();

after you have initialized the session, you can assign and use your session variables as follows:

$_SESSION[variablename] = $variable;

or you can retrieve the value of a session variable, even if was assigned in a different script as follows:

echo $_SESSION[variablename];

Once you are done using the session variables you can destroy them using the following code snippet:

$_SESSION = array();

session_destroy();

session_unset();

For more on using PHP sessions, visit PHP Session variables

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