(PHP 4, PHP 5, PHP 7)

session_nameLit et/ou modifie le nom de la session


string session_name ([ string $name ] )

session_name() retourne le nom de la session courante. Si le paramètre name est fourni, session_name() modifiera le nom de la session et retournera l'ancien nom de la session.

Le nom de la session est réinitialisé à la valeur par défaut, stockée dans 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


Le nom de session est utilisé comme nom pour les cookies et les URLs (i.e. PHPSESSID). 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.


Les noms de session ne peuvent pas contenir uniquement 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. Si le paramètre name est fourni et que la fonction met à jour le nom de la session, alors l'ancien nom de session sera retourné.


Exemple #1 Exemple avec session_name()


/* choisi le nom de session  : WebsiteID */

$previous_name session_name("WebsiteID");

"L'ancien nom de la session était $previous_name<br />";

Voir aussi

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User Contributed Notes 6 notes

Hongliang Qiang
14 years ago
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.
relsqui at chiliahedron dot com
9 years ago
Remember, kids--you MUST use session_name() first if you want to use session_set_cookie_params() to, say, change the session timeout. Otherwise it won't work, won't give any error, and nothing in the documentation (that I've seen, anyway) will explain why.

Thanks to brandan of who left a note under session_set_cookie_params() explaining this or I'd probably still be throwing my hands up about it.
php at wiz dot cx
10 years ago
if you try to name a php session "" it gets converted to "example_com" and everything breaks.

don't use a period in your session name.
Joseph Dalrymple
7 years ago
For those wondering, this function is expensive!

On a script that was executing in a consistent 0.0025 seconds, just the use of session_name("foo") shot my execution time up to ~0.09s. By simply sacrificing session_name("foo"), I sped my script up by roughly 0.09 seconds.
Victor H
3 years ago
As  Joseph Dalrymple said, adding session_name do slow down a little bit the execution time.
But, what i've observed is that it decreased the fluctuation between requests.
Requests on my script fluctuated between 0,045 and 0,022 seconds. With session_name("myapp"), it goes to 0,050 and 0,045. Not a big deal, but that's a point to note.

For those with problems setting the name, when session.auto_start is set to 1, you need to set the on php.ini!
slave at codegrunt dot com
13 years ago
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:

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.

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