A PHP Session class with flash (next request only) data

Installation

require 'session.php';
$session = new Session();

Set new or update existing session variable

$session->set('name', 'value');
$session->set('name', ['value_1','value_2']);

Get session variable value

$value = $session->get('name');
//returns null if 'name' wasn't set

If given session variable not found then get returns null.

Flashing data

Flashing a session means the session variable will be available only for next request. This is particularly useful for showing form validation error.

$session->flash('error', 'Username/Password incorrect');

Retrieving the flash data

Getting the flash data is same as getting any other session variable

$error = $session->get('error');