mirror of
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127 lines
3.7 KiB
XML
127 lines
3.7 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision$ -->
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<sect1 id="caching.multiple.caches">
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<title>Multiple Caches Per Page</title>
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<para>
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You can have multiple cache files for a single call to display() or
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fetch(). Let's say that a call to display('index.tpl') may have several
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different output contents depending on some condition, and you want
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separate caches for each one. You can do this by passing a cache_id as the
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second parameter to the function call.
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</para>
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<example>
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<title>passing a cache_id to display()</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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require('Smarty.class.php');
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$smarty = new Smarty;
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$smarty->caching = true;
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$my_cache_id = $_GET['article_id'];
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$smarty->display('index.tpl',$my_cache_id);
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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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Above, we are passing the variable $my_cache_id to display() as the
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cache_id. For each unique value of $my_cache_id, a separate cache will be
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generated for index.tpl. In this example, "article_id" was passed in the
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URL and is used as the cache_id.
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</para>
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<note>
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<title>Technical Note</title>
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<para>
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Be very cautious when passing values from a client (web browser) into
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Smarty (or any PHP application.) Although the above example of using the
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article_id from the URL looks handy, it could have bad consequences. The
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cache_id is used to create a directory on the file system, so if the user
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decided to pass an extremely large value for article_id, or write a script
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that sends random article_ids at a rapid pace, this could possibly cause
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problems at the server level. Be sure to sanitize any data passed in before
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using it. In this instance, maybe you know the article_id has a length of
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10 characters and is made up of alpha-numerics only, and must be a valid
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article_id in the database. Check for this!
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</para>
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</note>
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<para>
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Be sure to pass the same cache_id as the
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second parameter to <link linkend="api.is.cached">is_cached()</link> and
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<link linkend="api.clear.cache">clear_cache()</link>.
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</para>
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<example>
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<title>passing a cache_id to is_cached()</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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require('Smarty.class.php');
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$smarty = new Smarty;
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$smarty->caching = true;
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$my_cache_id = $_GET['article_id'];
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if(!$smarty->is_cached('index.tpl',$my_cache_id)) {
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// No cache available, do variable assignments here.
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$contents = get_database_contents();
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$smarty->assign($contents);
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}
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$smarty->display('index.tpl',$my_cache_id);
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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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You can clear all caches for a particular cache_id by passing null as the
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first parameter to clear_cache().
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</para>
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<example>
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<title>clearing all caches for a particular cache_id</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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require('Smarty.class.php');
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$smarty = new Smarty;
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$smarty->caching = true;
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// clear all caches with "sports" as the cache_id
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$smarty->clear_cache(null,"sports");
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$smarty->display('index.tpl',"sports");
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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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In this manner, you can "group" your caches together by giving them the
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same cache_id.
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</para>
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</sect1>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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