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Add more description for $_SESSION and $HTTP_SESSION_VARS.
# Hopefully, there will be less bug reports. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@67219 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Yasuo Ohgaki
parent
c2dd48c7fa
commit
10448f3d83
1 changed files with 144 additions and 19 deletions
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@ -1,5 +1,5 @@
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.70 $ -->
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<!-- $Revision: 1.71 $ -->
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<reference id="ref.session">
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<title>Session handling functions</title>
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<titleabbrev>Sessions</titleabbrev>
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@ -51,6 +51,12 @@
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linkend="ini.track-vars"><literal>track_vars</literal></link> is
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always turned on.
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</para>
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<para>
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As of PHP 4.1.0, $_SESSION is available as global variable just
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like $_POST, $_GET, $_REQUEST and so on. Not like
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$HTTP_SESSION_VARS, $_SESSION is always global. Therefore,
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<literal>global</literal> should not be used for $_SESSION.
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</para>
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</note>
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<para>
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@ -71,8 +77,51 @@
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<programlisting role="php">
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<![CDATA[
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<?php
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session_register("count");
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$HTTP_SESSION_VARS["count"]++;
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if (isset($HTTP_SESSION_VARS['count'])) {
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$HTTP_SESSION_VARS['count']++;
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}
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else {
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$HTTP_SESSION_VARS['count'] = 0;
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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Use of $_SESSION (or $HTTP_SESSION_VARS with PHP 4.0.6 or less) is
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recommended for security and code readablility. With $_SESSION or
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$HTTP_SESSION_VARS, there is no need to use
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session_register()/session_unregister()/session_is_registered()
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functions. Users can access session variable like a normal
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variable.
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<example>
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<title>
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Registering a variable with $_SESSION.
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</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Use $HTTP_SESSION_VARS with PHP 4.0.6 or less
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if (!isset($_SESSION['count'])) {
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$_SESSION['count'] = 0;
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}
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else {
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$_SESSION['count']++;
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?>
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]]>
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</programlisting>
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</example>
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<example>
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<title>
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Unregistering a variable with $_SESSION.
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</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Use $HTTP_SESSION_VARS with PHP 4.0.6 or less
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unset($_SESSION['count']);
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?>
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]]>
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</programlisting>
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@ -83,8 +132,12 @@ $HTTP_SESSION_VARS["count"]++;
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linkend="ini.register-globals"><literal>register_globals</literal></link>
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is enabled, then all global variables can be registered as session
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variables and the session variables will be restored to
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corresponding global variables.
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<example>
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corresponding global variables. Since PHP must know which global
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variables are registered as session variables, users must register
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variables with session_register() function while
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$HTTP_SESSION_VARS/$_SESSION does not need to use
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session_register().
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<example>
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<title>
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Registering a variable with <link
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linkend="ini.register-globals"><literal>register_globals</literal></link>
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@ -93,8 +146,13 @@ $HTTP_SESSION_VARS["count"]++;
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<programlisting role="php">
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<![CDATA[
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<?php
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session_register("count");
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$count++;
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if (!session_is_registered('count')) {
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session_register("count");
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$count = 0;
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}
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else {
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$count++;
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}
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?>
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]]>
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</programlisting>
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@ -148,8 +206,13 @@ $count++;
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<programlisting role="php">
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<![CDATA[
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<?php
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session_register ("count");
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$count++;
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if (!session_is_registered('count')) {
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session_register('count');
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$count = 1;
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}
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else {
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$count++;
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}
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?>
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Hello visitor, you have seen this page <?php echo $count; ?> times.<p>;
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@ -199,7 +262,9 @@ To continue, <A HREF="nextpage.php?<?=SID?>">click here</A>
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<literal>session.save_path</literal> defines the argument which
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is passed to the save handler. If you choose the default files
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handler, this is the path where the files are created.
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Defaults to <literal>/tmp</literal>.
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Defaults to <literal>/tmp</literal>. If
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<literal>session.save_path</literal>'s path depth is more than
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2, garbage collection will not be performed.
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</simpara>
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<warning>
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<para>
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@ -293,13 +358,13 @@ To continue, <A HREF="nextpage.php?<?=SID?>">click here</A>
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<listitem>
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<simpara>
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<literal>session.cookie_path</literal> specifies path to set
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in session_cookie. Defaults to <literal>/</literal>.
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in session_cookie. Defaults to <literal>/</literal>.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<literal>session.cookie_domain</literal> specifies domain to
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set in session_cookie. Default is none at all.
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set in session_cookie. Default is none at all.
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</simpara>
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</listitem>
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<listitem>
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@ -374,6 +439,20 @@ To continue, <A HREF="nextpage.php?<?=SID?>">click here</A>
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browser.
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</para>
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</note>
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<simpara>
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<function>session_start</function> will register internal output
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handler for URL rewriting when <literal>trans-sid</literal> is
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enabled. If a user uses <literal>ob_gzhandler</literal> or like
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with <function>ob_start</function>, the order of output handler
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is important for proper output. For example, user must register
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<literal>ob_gzhandler</literal> before session start.
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</simpara>
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<note>
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<simpara>
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Use of <literal>zlib.output_compression</literal> is recommended
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rather than <literal>ob_gzhandler</literal>
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</simpara>
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</note>
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</refsect1>
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</refentry>
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@ -408,12 +487,32 @@ To continue, <A HREF="nextpage.php?<?=SID?>">click here</A>
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<![CDATA[
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<?php
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# Initialize the session.
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# If you are using session_name("something"), don't forget it now!
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// Initialize the session.
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// If you are using session_name("something"), don't forget it now!
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session_start();
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# Unset all of the session variables.
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// Unset all of the session variables.
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session_unset();
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# Finally, destroy the session.
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// Finally, destroy the session.
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session_destroy();
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>Destroying a session with $_SESSION</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Initialize the session.
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// If you are using session_name("something"), don't forget it now!
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session_start();
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// Unset all of the session variables.
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unset($_SESSION);
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// Finally, destroy the session.
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session_destroy();
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?>
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@ -460,9 +559,9 @@ session_destroy();
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<![CDATA[
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<?php
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# set the session name to WebsiteID
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// set the session name to WebsiteID
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$previous_name = session_name ("WebsiteID");
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$previous_name = session_name("WebsiteID");
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echo "The previous session name was $previous_name<p>";
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?>
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@ -622,6 +721,11 @@ $_SESSION["spongebob"] = "He's got square pants.";
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list of functions that return resources are available in the
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<link linkend="resource">resource types</link> appendix.
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</para>
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<para>
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If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is
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used, assign variable to $_SESSION. i.e. $_SESSION['var'] =
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'ABC';
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</para>
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</note>
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<para>
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See also <function>session_is_registered</function> and
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@ -654,6 +758,13 @@ $_SESSION["spongebob"] = "He's got square pants.";
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This function returns &true; when the variable is successfully
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unregistered from the session.
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</para>
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<note>
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<para>
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If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is
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used, use <function>unset</function> to unregister a session
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variable.
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</para>
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</note>
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<caution>
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<para>
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This function doesn't unset the corresponding global variable for
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@ -684,6 +795,13 @@ $_SESSION["spongebob"] = "He's got square pants.";
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The <function>session_unset</function> function free's all session variables
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currently registered.
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</para>
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<note>
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<para>
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If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is
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used, use <function>unset</function> to unregister session
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variable. i.e. unset($_SESSION));
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</para>
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</note>
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</refsect1>
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</refentry>
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@ -707,6 +825,13 @@ $_SESSION["spongebob"] = "He's got square pants.";
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is a variable with the name <parameter>name</parameter>
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registered in the current session.
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</para>
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<note>
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<para>
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If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is
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used, use <function>isset</function> to check a variable is
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registered in $_SESSION.
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</para>
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</note>
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</refsect1>
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</refentry>
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@ -913,7 +1038,7 @@ function read ($id) {
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$sess_data = fread($fp, filesize($sess_file));
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return($sess_data);
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} else {
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return("");
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return(""); // Must return ("") here.
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}
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}
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