When setting a session with PHP, how do you make it global to the entire site?

Question

I am creating a session and I want a variable to be available for the entire site, so for example:

Joe Soap lands on a page called red-widgets.php, - Joe's session variable is let's say 'red-widgets'. Joe then clicks on another page called blue-widgets.php. I would like the session variable to be still the original 'red-widgets'.

How can this be done with the url?

Answer 1

You are not limited to one session variable, you can have as many as you need.

session_start();

if ( !isset($_SESSION['widget']) ) {
  $_SESSION['widget'] = 'i am changed only if there isnt already a widget session var';
}

$_SESSION['someOtherVar'] = 'i am being changed on every page';

Answer 2

Whenever a PHP page loads, just call session_start();. This will either 1. start a new session if one doesn't exist, or 2. restart whatever session was previously established. To make a new session variable, do this:

session_start(); // start or restart the session
$_SESSION['mySessionVariableName'] = "My session variable value.";

If you want to kill a session so that you can start a new one, you can do:

session_destroy();

If you want to erase all session variables but not kill the current session, you can do:

session_unset();

Answer 3

Simple: on red-widgets.php:

 session_start(); 
 $_SESSION['red-widgets'] = 1;

on blue-widgets.php:

session_start();
 if(!$_SESSION['red-widgets']){
  //Joe weren't on red-widget.php, diffrent action here...
}