PHP-Sessions

Sessions is an object which is used to store single OR multiple values in form of array OR string OR an object. These values are maintained/stored when you navigate  one more more pages. Normal variable destroy automatically when you navigate the pages.

Difference between Session variable and Normal variable.

Normal variable	Session variable
Destroy when refresh the page	value are maintain when refresh the page
Store in Memory	Store in cookie
Stored location cannot be change	Location can be changed
-NA-	In Login/Logout functionalities use session
You can declare/use any where in php pages	Need to start session befor use the session use session_start() to start the session
variable deleted automatically when out of scope	Session need to delete manually. Session delete automatically when it expire.
delete automatically when out of scope	use "session_destroy()" to destroy

How to Create Session variable

session_start(); //use only once in whole website

/** create variable **/
$_SESSION['count']=1;

/** use variable **/
$count = $_SESSION['count'];

How to Destroy session variable

unset($_SESSION['count']);