mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-16 00:48:54 +00:00
db367ae954
See the following bug report for details: http://bugs.php.net/44736 git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@260480 c90b9560-bf6c-de11-be94-00142212c4b1
103 lines
3.3 KiB
XML
103 lines
3.3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
|
|
<!-- $Revision: 1.4 $ -->
|
|
<!-- Purpose: basic.session -->
|
|
<!-- Membership: core -->
|
|
|
|
<book xml:id="book.session" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
|
|
<title>Session Handling</title>
|
|
<titleabbrev>Sessions</titleabbrev>
|
|
|
|
<!-- {{{ preface -->
|
|
<preface xml:id="intro.session">
|
|
&reftitle.intro;
|
|
<para>
|
|
Session support in PHP consists of a way to preserve certain data
|
|
across subsequent accesses. This enables you to build more
|
|
customized applications and increase the appeal of your web site.
|
|
</para>
|
|
<para>
|
|
A visitor accessing your web site is assigned a unique id, the
|
|
so-called session id. This is either stored in a cookie on the
|
|
user side or is propagated in the URL.
|
|
</para>
|
|
<para>
|
|
The session support allows you to register arbitrary numbers of
|
|
variables to be preserved across requests. When a visitor accesses
|
|
your site, PHP will check automatically (if <link
|
|
linkend="ini.session.auto-start">session.auto_start</link>
|
|
is set to 1) or on your request (explicitly through
|
|
<function>session_start</function> or implicitly through
|
|
<function>session_register</function>) whether a specific session
|
|
id has been sent with the request. If this is the case, the prior
|
|
saved environment is recreated.
|
|
</para>
|
|
<caution>
|
|
<para>
|
|
If you do turn on <link linkend="ini.session.auto-start">
|
|
session.auto_start</link> then you cannot put objects into
|
|
your sessions since the class definition has to be
|
|
loaded before starting the session in order to recreate the
|
|
objects in your session.
|
|
</para>
|
|
</caution>
|
|
<para>
|
|
All registered variables are serialized after the request
|
|
finishes. Registered variables which are undefined are marked as
|
|
being not defined. On subsequent accesses, these are not defined
|
|
by the session module unless the user defines them later.
|
|
</para>
|
|
<warning>
|
|
<para>
|
|
Some types of data can not be serialized thus stored in sessions. It
|
|
includes <type>resource</type> variables or objects with circular
|
|
references (i.e. objects which passes a reference to itself to another
|
|
object).
|
|
</para>
|
|
</warning>
|
|
<note>
|
|
<para>
|
|
Session handling was added in PHP 4.0.0.
|
|
</para>
|
|
</note>
|
|
<note>
|
|
<para>
|
|
Please note when working with sessions that a record of a session
|
|
is not created until a variable has been registered using the
|
|
<function>session_register</function> function or by adding a new
|
|
key to the <varname>$_SESSION</varname> superglobal array. This
|
|
holds true regardless of if a session has been started using the
|
|
<function>session_start</function> function.
|
|
</para>
|
|
</note>
|
|
</preface>
|
|
<!-- }}} -->
|
|
|
|
&reference.session.setup;
|
|
&reference.session.constants;
|
|
&reference.session.examples;
|
|
&reference.session.security;
|
|
&reference.session.reference;
|
|
|
|
</book>
|
|
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"../../../manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|
|
|