Passing errors via sessions?

[PHPycho]

Hello forums!
As we know information can be passed through pages using Query strings, forms, cookies, sessions.
I would like to know how sessions can be used effectively to pass errors between different pages?
Thanks in advance to all of you.

[PHPycho]

knock knock

[d40sithui]

something like this?

//first page
<?
session_start();
$error = "some error";
$_SESSION['error'] = $error;

?>

-----------
//second page
<?
session_start();

//retrieves error
$error = $_SESSION['error'];

print_r($error); //print_r($_SESSION['error']);
//this will print

//adds more error,untested may need to first fine cur position in arr
//u can use for/while loop for this
$error[] = "some more error";

//reassigns to session
$_SESSION['error'] = $error;

//$_SESSION['error'] now contains "some error" and "some more error"

?>