mirror of
https://github.com/smarty-php/smarty.git
synced 2025-10-04 16:20:55 +02:00
127 lines
3.7 KiB
XML
127 lines
3.7 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
|
|
<!-- $Revision$ -->
|
|
<sect1 id="caching.multiple.caches">
|
|
<title>Multiple Caches Per Page</title>
|
|
<para>
|
|
You can have multiple cache files for a single call to display() or
|
|
fetch(). Let's say that a call to display('index.tpl') may have several
|
|
different output contents depending on some condition, and you want
|
|
separate caches for each one. You can do this by passing a cache_id as the
|
|
second parameter to the function call.
|
|
</para>
|
|
<example>
|
|
<title>passing a cache_id to display()</title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
require('Smarty.class.php');
|
|
$smarty = new Smarty;
|
|
|
|
$smarty->caching = true;
|
|
|
|
$my_cache_id = $_GET['article_id'];
|
|
|
|
$smarty->display('index.tpl',$my_cache_id);
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
</example>
|
|
<para>
|
|
Above, we are passing the variable $my_cache_id to display() as the
|
|
cache_id. For each unique value of $my_cache_id, a separate cache will be
|
|
generated for index.tpl. In this example, "article_id" was passed in the
|
|
URL and is used as the cache_id.
|
|
</para>
|
|
<note>
|
|
<title>Technical Note</title>
|
|
<para>
|
|
Be very cautious when passing values from a client (web browser) into
|
|
Smarty (or any PHP application.) Although the above example of using the
|
|
article_id from the URL looks handy, it could have bad consequences. The
|
|
cache_id is used to create a directory on the file system, so if the user
|
|
decided to pass an extremely large value for article_id, or write a script
|
|
that sends random article_ids at a rapid pace, this could possibly cause
|
|
problems at the server level. Be sure to sanitize any data passed in before
|
|
using it. In this instance, maybe you know the article_id has a length of
|
|
10 characters and is made up of alpha-numerics only, and must be a valid
|
|
article_id in the database. Check for this!
|
|
</para>
|
|
</note>
|
|
<para>
|
|
Be sure to pass the same cache_id as the
|
|
second parameter to <link linkend="api.is.cached">is_cached()</link> and
|
|
<link linkend="api.clear.cache">clear_cache()</link>.
|
|
</para>
|
|
<example>
|
|
<title>passing a cache_id to is_cached()</title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
require('Smarty.class.php');
|
|
$smarty = new Smarty;
|
|
|
|
$smarty->caching = true;
|
|
|
|
$my_cache_id = $_GET['article_id'];
|
|
|
|
if(!$smarty->is_cached('index.tpl',$my_cache_id)) {
|
|
// No cache available, do variable assignments here.
|
|
$contents = get_database_contents();
|
|
$smarty->assign($contents);
|
|
}
|
|
|
|
$smarty->display('index.tpl',$my_cache_id);
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
</example>
|
|
<para>
|
|
You can clear all caches for a particular cache_id by passing null as the
|
|
first parameter to clear_cache().
|
|
</para>
|
|
<example>
|
|
<title>clearing all caches for a particular cache_id</title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
require('Smarty.class.php');
|
|
$smarty = new Smarty;
|
|
|
|
$smarty->caching = true;
|
|
|
|
// clear all caches with "sports" as the cache_id
|
|
$smarty->clear_cache(null,"sports");
|
|
|
|
$smarty->display('index.tpl',"sports");
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
</example>
|
|
<para>
|
|
In this manner, you can "group" your caches together by giving them the
|
|
same cache_id.
|
|
</para>
|
|
|
|
</sect1>
|
|
|
|
<!-- 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
|
|
-->
|