session_module_name
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.
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. 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 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 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
nameest 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 Notes
session_name - [6 notes]
Hongliang Qiang ¶
8 years ago
Joseph Dalrymple ¶
2 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.
relsqui at chiliahedron dot com ¶
4 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 bildungsroman.com 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 ¶
4 years ago
if you try to name a php session "example.com" it gets converted to "example_com" and everything breaks.
don't use a period in your session name.
slave at codegrunt dot com ¶
8 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:
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
webmaster at nncoders dot de ¶
4 years ago
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)