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PHP: session_name - Manual
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Last updated: Thu, 03 May 2007

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session_name

(PHP 4, PHP 5)

session_name — カレントのセッション名を取得または設定する

説明

string session_name ( [string $name] )

session_name() は、カレントのセッション名を 返します。name を指定した場合、カレントの セッション名は、その値に変更されます。

セッション名は、クッキーおよび URL のセッション ID を参照します。 セッション名は英数字のみで構成されている必要があり、また、短かく、 その内容が分かるようなものである必要があります (これは、クッキー警告を 有効にしているユーザ用です)。セッション名は、リクエストが開始された際に セッション名に保存された session.name の デフォルト値にリセットされます。よって、各リクエスト毎に(そして session_start() または session_register() をコールする前に) session_name() をコールする必要があります。

警告

セッション名は数字だけで構成することはできません。少なくとも 文字がひとつ以上現れる必要があります。そうでない場合、 新規セッション ID が毎回生成されます。

例 2143. session_name() の例

<?php

// セッション名をWebsiteIDに設定する

$previous_name = session_name("WebsiteID");

echo
"前回のセッション名は、$previous_name です。<br />";
?>

session.name 設定ディレクティブも参照してください。



add a note add a note User Contributed Notes
session_name
72
03-Apr-2007 05:00
Hello,
if you using dot (.) char in session name it can't be loaded back properly. After each call new session id will be generated so your old session data is lost!
Juergen Nantke - info at nantke dot de
11-Aug-2005 12:11
Be carefull not use a dot (.) in the session name.
tjerk dot meesters at gmail dot com
13-Jul-2005 07:32
Another way of preventing a warning being issued, is by using only cookies to propagate a session:

 ini_set('session.use_only_cookies',1);
php at REMOVETHIS dot kennel17 dot co dot uk
27-Jun-2005 11:47
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
23-Dec-2004 07:03
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
28-May-2004 05:48
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.

 
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