session_module_name
Here's a sample program I made to explore the operation of the session stuff. One thing I wanted to do was switch sessions in the middle of a script - where session_name doesn't automatically create or resume the corresponding session id... (anyone have a better idea?)
<?php
if ( $_REQUEST['sname'] ) {
session_name($_REQUEST['sname']);
}
session_start();
$messages = "";
function show( $str ) { global $messages; $messages .= $str; }
function show_sess_vars() {
foreach ( $_SESSION as $key => $val ) {
show("Session var '$key': \t'$val'\n");
}
}
show("Session name: \t" . session_name() . "\n");
show("Session ID: \t" . session_id() . "\n");
foreach ( $_REQUEST as $key => $val ) {
if ( $key == 'regenerate' )
{
session_regenerate_id();
show("session_regenerate_id();\n");
show("Session name: \t" . session_name() . "\n");
show("Session ID: \t" . session_id() . "\n");
}
else if ( $key == 'clear' )
{
$_SESSION = array();
show("\$_SESSION = array();\n");
}
else if ( $key == 'switch' )
{
show("Will attempt to switch session name.. vars:\n");
show_sess_vars();
session_write_close();
$res = session_name($val);
show("session_name($val) - res: $res\n");
session_start();
show("Session name: \t" . session_name() . "\n");
show("Session ID: \t" . session_id() . "\n");
}
else if ( $key == 'switch2' )
{
show("Will attempt to switch session name.. vars:\n");
show_sess_vars();
session_write_close();
show("session_write_close();\n");
$sess_id = $_COOKIE[$val];
if ( $sess_id ) {
show("session '$val' exists, resuming..\n");
//unset($_SESSION); // to make sure - this should be reloaded below
session_name( $val );
session_id( $sess_id );
session_start(); // fills $_SESSION from the named session
} else {
show("creating new session '$val'...\n");
session_name( $val );
session_start();
session_regenerate_id(); // create new (copy of old), leave old alone
$_SESSION = array(); // wipe data clean for a fresh session
show("regenerated ID and wiped SESSION superglobal\n");
}
show("Session name: \t" . session_name() . "\n");
show("Session ID: \t" . session_id() . "\n");
}
else
{
if ( $_COOKIE[$key] ) {
show("Cookie: \t'$key': \t'$val'\n");
} else {
show("Setting session var: \t'$key': \t'$val'\n");
$_SESSION[$key] = $val;
}
}
}
show("----\nSession vars:\n");
show_sess_vars();
if ( false ) {
session_write_close();
session_name("edit_assembly");
session_start();
show("Session name: \t" . session_name() . "\n");
show("Session ID: \t" . session_id() . "\n");
show_sess_vars();
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<title> PHP session testing </title>
<style type='text/css'>
body { background-color: gray; }
#content { background-color: white; width: 70%; margin: 1em auto 1em auto; padding: 2em;
font-family: Verdana, monospace; font-size: 10pt; }
</style>
</head>
<body>
<div id='content'>
<h1> PHP session test: </h1>
<pre><?php echo $messages; ?></pre>
</div>
</body>
</html>
session_name
(PHP 4, PHP 5)
session_name — Lit et/ou modifie le nom de la session
Description
string session_name
([ string $name
] )
session_name() retourne le nom de la session courante.
Le nom de la session est réinitialisé à la valeur par défaut, stockée dans session.name lors du démarrage. Ainsi, vous devez appeler session_name() pour chaque demande (et avant que les fonctions session_start() ou session_register() ne soient appelées).
Liste de paramètres
- name
-
Le nom de session est utilisé comme nom de cookie ou nom de variable dans les URL. Il ne doit contenir que des caractères alphanumériques ; il doit être court et descriptif (surtout pour les utilisateurs ayant activé l'alerte cookie). Si name est fourni, le nom de la session courante sera remplacé par cette valeur.
AvertissementLes noms de session ne peuvent contenir que des chiffres, au moins une lettre doit être présente. Sinon, un identifiant de session sera généré à chaque fois.
Valeurs de retour
Retourne le nom de la session courante.
Exemples
Exemple #1 Exemple avec session_name()
<?php
/* choisi le nom de session : WebsiteID */
$previous_name = session_name("WebsiteID");
echo "L'ancien nom de la session était $previous_name<br />";
?>
add a note
User Contributed Notessession_name
xemc at yahoo dot com
26-Aug-2008 10:20
26-Aug-2008 10:20
webmaster at nncoders dot de
26-Jun-2008 06:29
26-Jun-2008 06:29
You can always just use "or".
@foo or bar();
When foo fails, (and the at still means don't print an error to the browser), the function bar will be executed.
<?php
function errorhandler () { /* do something wild */ }
@session_name('mysession') or errorhandler();
?>
Another live example would be
@mysql_query('show databases') or die(mysql_error());
When the execution fails, parameter die is called (with last mysql_error as given string parameter)
php at REMOVETHIS dot kennel17 dot co dot uk
27-Jun-2005 04:47
27-Jun-2005 04:47
In response to codegrunt slave, you could suppress any warnings from being output by using the @ symbol.
<?php
// This will fail, but no message will be output:
@session_name("(bad name)");
?>
Alternatively, you could use output buffering instead of the @ symbol if you wanted to check whether an error occurred.
<?php
ob_start();
session_name("(bad name)");
$Output = ob_get_contents();
ob_end_clean();
if ($Output != "")
print("Bad session name!");
?>
slave at codegrunt dot com
22-Dec-2004 11:03
22-Dec-2004 11:03
One gotcha I have noticed with session_name is that it will trigger a WARNING level error if the cookie or GET/POST variable value has something other than alphanumeric characters in it. If your site displays warnings and uses PHP sessions this may be a way to enumerate at least some of your scripts:
http://example.com/foo.php?session_name_here=(bad)
Warning: session_start(): The session id contains invalid characters, valid characters are only a-z, A-Z and 0-9 in /some/path/foo.php on line 666
I did not see anything in the docs suggesting that one had to sanitize the PHP session ID values before opening the session but that appears to be the case.
Unfortunately session_name() always returns true so you have to actually get to the point of assigning variables values before you know whether you have been passed bad session data (as far as I can see). After the error has been generated in other words.
Cheers
Hongliang Qiang
27-May-2004 10:48
27-May-2004 10:48
This may sound no-brainer: the session_name() function will have no essential effect if you set session.auto_start to "true" in php.ini . And the obvious explanation is the session already started thus cannot be altered before the session_name() function--wherever it is in the script--is executed, same reason session_name needs to be called before session_start() as documented.
I know it is really not a big deal. But I had a quite hard time before figuring this out, and hope it might be helpful to someone like me.