Sessions are used to store data on server and retrieve it for a user while they travel through a series of pages, or page iterations, on your site. They are same as cookie , the only difference is that they are stored at server while cookie stored at client machine.
To start session
<?php
session_start();
$_SESSION['variable1'] = 'value1';
?>
To retrieve variable on other script/page use
<?php
session_start();
echo $_SESSION['variable1'];
?>
To start session
<?php
session_start();
$_SESSION['variable1'] = 'value1';
?>
To retrieve variable on other script/page use
<?php
session_start();
echo $_SESSION['variable1'];
?>
