(PHP 4, PHP 5)

session_nameLiefert und/oder setzt den Namen der aktuellen Session


string session_name ([ string $name ] )

session_name() gibt den Namen der aktuellen Session zurück. Falls name angegeben wurde, aktualisiert session_name() den Namen der Session und gibt den alten Namen der Session zurück.

Der Sessionname wird auf den Ausgangswert zurückgesetzt, der zu Beginn in gespeichert wurde. Deshalb muss session_name() bei jeder Anfrage aufgerufen werden (und bevor session_start() oder session_register() aufgerufen wurden).



Der Sessionname referenziert den Namen der Session, der in Cookies und URLs verwendet wird (z.B. PHPSESSID). Er sollte nur alphanumerische Zeichen enthalten und sollte kurz und beschreibend sein (z.B. für Benutzer mit aktivierter Cookie-Warnung). Wenn name angegeben wird, wird der Name der aktuellen Session durch dessen Wert ersetzt.


Der Sessionname kann nicht nur aus Zahlen bestehen, sondern muss mindestens einen Buchstaben enthalten. Andernfalls wird jedesmal eine neue Session-ID erzeugt.


Gibt den Namen der aktuellen Session zurück. Wird name übergegeben und die Funktion aktualisiert den Sessionnamen, wird der Name der alten Sitzung zurückgegeben.


Beispiel #1 session_name()-Beispiel

/* den Sessionnamen auf WebsiteID setzen */
$name_vorher session_name ("WebsiteID");
"Der vorhergehende Sessionname war $name_vorher<br />";

Siehe auch

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User Contributed Notes 6 notes

Hongliang Qiang
11 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.
php at wiz dot cx
7 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.
relsqui at chiliahedron dot com
6 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.
Joseph Dalrymple
4 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
1 month 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
10 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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