What is PHP session_start()

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The PHP session system lets you store securely data in the $_SESSION global array. A typical example is to store the user’s identifier in the session when they type in their password:

if ($user = try_login($login, $password)) 
  $_SESSION['user'] = $user;

Then, you can access that information on all other pages: 

if (isset($_SESSION['user']))
  // logged in !
  echo user_name($_SESSION['user']);

The data is stored on the server, so there is no risk of tampering (on the other hand, mind your disk usage).

Starting the session lets the current request use $_SESSION. If this is the user’s first visit, the array will be empty and a new session cookie will be sent for you.

Closing the session merely prevents the current request from using $_SESSION, but the data stays around for the next requests.

Destroying the session throws away all the data, forever. The sessions are destroyed a certain duration after the last visit (usually around 30 minutes).

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