mirror of
https://github.com/smarty-php/smarty.git
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141 lines
4.0 KiB
XML
141 lines
4.0 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision$ -->
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<sect1 id="caching.cacheable">
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<title>Controlling Cacheability of Plugins' Output</title>
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<para>
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Since Smarty-2.6.0 plugins the cacheability of plugins can be
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declared when registering them. The third parameter to
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<link linkend="api.register.block"><varname>register_block()</varname></link>,
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<link linkend="api.register.compiler.function">
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<varname>register_compiler_function()</varname></link> and <link
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linkend="api.register.function"><varname>register_function()</varname></link>
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is called <parameter>$cacheable</parameter> and defaults to &true; which
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is also the behaviour of plugins in Smarty versions before 2.6.0
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</para>
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<para>
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When registering a plugin with <literal>$cacheable=false</literal> the plugin
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is called everytime the page is displayed, even if the page comes
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from the cache. The plugin function behaves a little like an
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<link linkend="plugins.inserts"><varname>{insert}</varname></link> function.
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</para>
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<para>
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In contrast to <link linkend="plugins.inserts"><varname>{insert}</varname>
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</link>
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the attributes to the plugins are not cached by default. They can be
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declared to be cached with the fourth parameter
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<parameter>$cache_attrs</parameter>. <parameter>$cache_attrs</parameter>
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is an array of attribute-names that should be cached, so the
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plugin-function get value as it was the time the page was written
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to cache everytime it is fetched from the cache.
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</para>
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<example>
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<title>Preventing a plugin's output from being cached</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$smarty->caching = true;
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function remaining_seconds($params, &$smarty) {
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$remain = $params['endtime'] - time();
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if($remain >= 0){
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return $remain . ' second(s)';
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}else{
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return 'done';
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}
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}
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$smarty->register_function('remaining', 'remaining_seconds', false, array('endtime'));
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if (!$smarty->is_cached('index.tpl')) {
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// fetch $obj from db and assign...
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$smarty->assign_by_ref('obj', $obj);
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}
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$smarty->display('index.tpl');
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?>
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]]>
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</programlisting>
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<para>
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where <filename>index.tpl</filename> is:
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</para>
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<programlisting>
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<![CDATA[
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Time Remaining: {remaining endtime=$obj->endtime}
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]]>
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</programlisting>
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<para>
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The number of seconds till the endtime of <literal>$obj</literal> is reached
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changes on each display of the page, even if the page is cached. Since the
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endtime attribute is cached the object only has to be pulled from the
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database when page is written to the cache but not on subsequent requests
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of the page.
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</para>
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</example>
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<example>
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<title>Preventing a whole passage of a template from being cached</title>
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<programlisting role="php">
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<![CDATA[
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index.php:
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<?php
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$smarty->caching = 1;
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function smarty_block_dynamic($param, $content, &$smarty) {
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return $content;
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}
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$smarty->register_block('dynamic', 'smarty_block_dynamic', false);
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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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<para>
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where <filename>index.tpl</filename> is:
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</para>
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<programlisting>
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<![CDATA[
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Page created: {'0'|date_format:'%D %H:%M:%S'}
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{dynamic}
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Now is: {'0'|date_format:'%D %H:%M:%S'}
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... do other stuff ...
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{/dynamic}
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]]>
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</programlisting>
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</example>
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<para>
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When reloading the page you will notice that both dates differ. One
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is <quote>dynamic</quote> one is <quote>static</quote>. You can do everything
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between <literal>{dynamic}...{/dynamic}</literal> and be sure it will not
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be cached like the rest of the page.
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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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