A session is a way to store information to be used across multiple pages.
Unlike a cookie, the information is not stored on the users computer. It is stored either on a file on the server, in the database (MySQL for example), or Redis.
You can access the session variables through the
$_SESSION global variable.
You can start the session using the
session_start() function. If it has already started nothing will happen.
Note : The
session_start() function must be the first thing to be called in the file.
There are many configuration settings for sessions, and you can check them out in the manual, but we’ll focus on just the most important ones here.
session.name allows you to change the default session name to the name you want.
session.auto_start starts the session automatically. The default is
session.gc_maxlifetime sets the maximum lifetime for the session before invalidating it.
You can know the session name by calling the
session_name() function. The default name is
PHPSESSID, but you can change it easily in 4 ways:
php.ini file via the
By using the
ini_set() function at the start of the file before calling the
You can achieve this in 3 ways:
By calling the
session_unset() function which unsets the
setcookie(session_name(), '' ,time() - 3600);