A session class i wrote to learn more about classes. I think it's working good. And if there are any bugs, please post a comment.
And don't kill me for the bad english explanation, am no native!

By : Dios

<?php
/* Author: Stephan Six
E-Mail: DiosV2@AOL.com / Dios@six-Design.de
Homepage: http://www.six-design.de
Last-Modified: 14.08.2003

Copyright: Stephan Six

****************************************************

HowToUse:
Methods:
$foo = new my_session([bool Session_starten]); <-- Declare a new object of the class.
Use "new my_session(true)" to start a session.
$foo->start(); <-- Start a session.
$foo->session([Session_id]); <-- Gives you the session_id.
If a session_id is passed to the method, a new session will be started,
using the given session_id (See PHP-function: session_id())
$foo->stats(); <-- Shows you information about the environment. (PHP-version, reg_globals)
$foo->clear(); <-- Ends a session
$foo->test_cookies(); <-- Returns true if cookies are allowed, false if not.
Needs to be executed before any output is displayed. Because the page, needs
to be reloaded.
$foo->show(); <-- Shows all variables in a session
$foo->show_errors(); <-- Shows you an error-log. (To check if theres something wrong with the values,
given to the set-method.)
$foo->clear_errors(); <-- Clears the error-log (No real use, but anyway)

$foo->set(); <-- Registers a variable in a session. Values passed to the method, need to be:
A pair (or a number of pairs) of "Name => Value", or an Array where the key will be used as the var-name
and the value as the var-value.

Example:
$test = "text"; is to be registerd:

objekt->set(VarName, VarValue);
$foo->set("test", $test);
(It's the same as: $foo->set("test", "text");)
Another example:
$foo->set("value1", 1, "value2", 4);

Differences if register_globals = on/off:
Example:
$foo = 1;
$bar->set("foo", 2);
echo "foo = " . $foo;

register_globals = on:
Ausgabe: foo = 2;
register_globals = off:
Ausgabe: foo = 1;

$foo->get(["_ARRAY"]); <-- Get a variable from a Session.
If the string "_ARRAY" is passed, the method will return an Array with all session
variables.
Example:
You want $x to have the value of the session-var $bar:
var = objekt->get(SessionVarName);
$x = $foo->get("bar");
*/

class my_session{
var $rg;
var $old;
var $s_id;
var $errors;

function my_session($s = false){
if(ini_get("register_globals")) $this->rg = true;
else $this->rg = false;

if(phpversion() <= "4.1.0") $this->old = true;
else $this->old = false;

if($s == true) $this->start();
}

function start(){
session_start();
$this->s_id = session_id();
}

function sessionid($new_id = false){
if(!$new_id) return $this->s_id;
else session_id($new_id);
}

function clear(){ session_destroy(); }

function set(){
$v = func_get_args();

if(is_array($v[0])){
foreach($v[0] as $k => $value){
if($this->check_var_syntax($k)) $this->reg_vars($k, $value);
}
} else {
if(count($v) % 2){
$this->errors[] = "Variable '" . $v[count($v) - 1] . "' ignored";
array_pop($v);
}

for($i = 0; $i < count($v); $i += 2){
if($this->check_var_syntax($v[$i])) $this->reg_vars($v[$i], $v[$i+1]);
}
}
}

function check_var_syntax($buff){
if(preg_match("!^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$!i", $buff)) return true;
else {
$this->errors[] = "Variable '<i>" . $buff . "</i>' ignored,<br>wrong syntax";
return false;
}
}

function reg_vars($n, $v){
if($this->rg){
$GLOBALS[$n] = $v;
session_register("$n");
} else {
session_register("$n");
if($this->old) $GLOBALS['HTTP_SESSION_VARS'][$n] = $v;
else $GLOBALS['_SESSION'][$n] = $v;
}
}

function get($buff){
if($buff == "_ARRAY"){
if($this->old) return $GLOBALS['HTTP_SESSION_VARS'];
else return $GLOBALS['_SESSION'];
} if($this->old) return $GLOBALS['HTTP_SESSION_VARS'][$buff];
else return $GLOBALS['_SESSION'][$buff];
}

function test_cookies(){
if($this->old) $url = $GLOBALS['HTTP_SERVER_VARS']['PHP_SELF'] . "?" . $GLOBALS['HTTP_SERVER_VARS']['QUERY_STRING'];
else $url = $GLOBALS['_SERVER']['PHP_SELF'] . "?" . $GLOBALS['_SERVER']['QUERY_STRING'];

$start = $this->get("start");

if($start > 0){
switch($start){
case 1:
setcookie("cookie", "1");
$this->set("start", 2);
header("Location: $url");
break;
case 2:
if($this->old) ($GLOBALS['HTTP_COOKIE_VARS']['cookie']) ? ($cookies = true) : ($cookies = false);
else ($GLOBALS['_COOKIE']['cookie']) ? ($cookies = true) : ($cookies = false);
break;
}
} else {
$this->set("start", 1);
header("Location: $url&PHPSESSID=" . session_id());
}
return $cookies;
}

function stats(){
$stats = array();
if($this->rg) $stats['register_globals'] = 1;
else $stats['register_globals'] = 0;

$stats['PHP-Version'] = phpversion();

$this->display("Description", "Value", $stats);
}

function show(){
if($this->old) $session_values = $GLOBALS['HTTP_SESSION_VARS'];
else $session_values = $GLOBALS['_SESSION'];

if(!is_array($session_values)) $session_values = array("No session-vars" => "");

$this->display("Name of the variable", "Value", $session_values);
}

function show_errors(){
if(!is_array($this->errors)) $this->errors[] = "No error";

$this->display("Description", "", $this->errors, "left");
}

function clear_errors(){ $this->errors = ""; }

function display($head_1, $head_2, $content, $align = "center"){
echo '<table width="300" border="0" cellspacing="0" cellpadding="3" align="center" style="font-family: Arial, Helvetica, Verdana, sans-serif; font-size: 10pt;">
<tr>
<td bgcolor="#cccccc"><b>' . $head_1 . '</b></td>
<td bgcolor="#cccccc">&nbsp;</td>
<td bgcolor="#cccccc" align="' . $align . '"><b>' . $head_2 . '</b></td>
</tr>';

foreach($content as $k => $v){
($i++ % 2) ? ($c = "#e0e0e0") : ($c = "#eeeeee");
echo '<tr>
<td bgcolor="' . $c . '">' . $k . '</td>
<td bgcolor="' . $c . '">&nbsp;</td>
<td bgcolor="' . $c . '" align="' . $align . '">' . $v . '</td>
</tr>';
}
echo '</table>';
}
}
?>

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