mirror of
https://github.com/smarty-php/smarty.git
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206 lines
6.1 KiB
XML
206 lines
6.1 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision$ -->
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<sect1 id="caching.setting.up">
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<title>Setting Up Caching</title>
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<para>
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The first thing to do is enable caching by setting <link
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linkend="variable.caching">$caching</link> = true (or 1.)
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</para>
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<example>
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<title>enabling caching</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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require('Smarty.class.php');
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$smarty = new Smarty;
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$smarty->caching = true;
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$smarty->display('index.tpl');
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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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With caching enabled, the function call to display('index.tpl') will render
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the template as usual, but also saves a copy of its output to a file (a
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cached copy) in the <link linkend="variable.cache.dir">$cache_dir</link>.
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Upon the next call to display('index.tpl'), the cached copy will be used
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instead of rendering the template again.
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</para>
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<note>
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<title>Technical Note</title>
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<para>
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The files in the
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<link linkend="variable.cache.dir">$cache_dir</link>
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are named similar to the template name.
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Although they end in the ".php" extention, they are not really executable
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php scripts. Do not edit these files!
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</para>
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</note>
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<para>
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Each cached page has a limited lifetime determined by <link
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linkend="variable.cache.lifetime">$cache_lifetime</link>. The default value
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is 3600 seconds, or 1 hour. After that time expires, the cache is
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regenerated. It is possible to give individual caches their own expiration
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time by setting
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<link linkend="variable.caching">$caching</link> = 2.
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See <link
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linkend="variable.cache.lifetime">$cache_lifetime</link> for more details.
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</para>
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<example>
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<title>setting $cache_lifetime per cache</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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require('Smarty.class.php');
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$smarty = new Smarty;
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$smarty->caching = 2; // lifetime is per cache
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// set the cache_lifetime for index.tpl to 5 minutes
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$smarty->cache_lifetime = 300;
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$smarty->display('index.tpl');
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// set the cache_lifetime for home.tpl to 1 hour
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$smarty->cache_lifetime = 3600;
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$smarty->display('home.tpl');
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// NOTE: the following $cache_lifetime setting will not work when $caching = 2.
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// The cache lifetime for home.tpl has already been set
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// to 1 hour, and will no longer respect the value of $cache_lifetime.
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// The home.tpl cache will still expire after 1 hour.
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$smarty->cache_lifetime = 30; // 30 seconds
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$smarty->display('home.tpl');
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?>
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]]>
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</programlisting>
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</example>
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<para>
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If <link linkend="variable.compile.check">$compile_check</link> is enabled,
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every template file and config file that is involved with the cache file is
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checked for modification. If any of the files have been modified since the
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cache was generated, the cache is immediately regenerated. This is a slight
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overhead so for optimum performance, leave
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<link linkend="variable.compile.check">$compile_check</link>
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set to false.
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</para>
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<example>
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<title>enabling $compile_check</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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require('Smarty.class.php');
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$smarty = new Smarty;
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$smarty->caching = true;
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$smarty->compile_check = true;
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$smarty->display('index.tpl');
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?>
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]]>
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</programlisting>
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</example>
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<para>
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If <link linkend="variable.force.compile">$force_compile</link> is enabled,
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the cache files will always be regenerated. This effectively turns off
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caching.
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<link linkend="variable.force.compile">$force_compile</link>
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is usually for
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<link
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linkend="chapter.debugging.console">debugging</link>
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purposes only, a more
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efficient way of disabling caching is to set <link
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linkend="variable.caching">$caching</link> = false (or 0.)
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</para>
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<para>
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The <link linkend="api.is.cached">is_cached()</link> function
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can be used to test if a template has a valid cache or not. If you have a
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cached template that requires something like a database fetch, you can use
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this to skip that process.
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</para>
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<example>
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<title>using 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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if(!$smarty->is_cached('index.tpl')) {
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// No cache available, do variable assignments here.
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$contents = get_database_contents();
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$smarty->assign($contents);
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}
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$smarty->display('index.tpl');
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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 keep parts of a page dynamic with the <link
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linkend="language.function.insert">{insert}</link> template function. Let's
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say the whole page can be cached except for a banner that is displayed down
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the right side of the page. By using an
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<link linkend="language.function.insert">{insert}</link>
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function for the banner, you
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can keep this element dynamic within the cached content. See the
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documentation on <link linkend="language.function.insert">{insert}</link> for
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more details and examples.
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</para>
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<para>
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You can clear all the cache files with the <link
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linkend="api.clear.all.cache">clear_all_cache()</link> function, or
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individual cache files
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<link linkend="caching.groups">(or groups)</link>
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with the <link
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linkend="api.clear.cache">clear_cache()</link> function.
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</para>
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<example>
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<title>clearing the cache</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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$smarty->caching = true;
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// clear out all cache files
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$smarty->clear_all_cache();
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// clear only cache for index.tpl
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$smarty->clear_cache('index.tpl');
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$smarty->display('index.tpl');
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?>
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]]>
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</programlisting>
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</example>
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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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