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Smarty模板编译引擎序 I.开始第一章. 什么是Smarty? 第二章. 安装要求基本安装扩展设置 II.模板设计者篇第三章.基本语法注释函数属性第四章.变量从PHP分配的变量 Associative arrays Array indexes Objects 从配置文件读取的变量 {$smarty}保留变量 Request variables {$smarty.now} {$smarty.const} {$smarty.capture} {$smarty.config} {$smarty.section} {$smarty.template} 第五章.变量调节器 capitalize count_characters cat count_paragraphs count_sentences count_words date_format default escape indent lower nl2br regex_replace replace spacify string_format strip strip_tags truncate upper wordwrap 第六章.组合修改器第七章.内建函数 capture config_load foreach include include_php insert if ldelim literal php section index index_prev index_next iteration first last rownum loop show total strip 第八章.自定义函数 assign counter cycle debug eval fetch html_checkboxes html_image html_options html_radios html_select_date html_select_time html_table math mailto popup_init popup textformat 第九章.配置文件第十章.调试控制台 III.模板程序员篇第十一章常量 SMARTY_DIR 第十二章变量 $template_dir $compile_dir $config_dir $plugins_dir $debugging $debug_tpl $debugging_ctrl $global_assign $undefined $autoload_filters $compile_check $force_compile $caching $cache_dir $cache_lifetime $cache_handler_func $cache_modified_check $config_overwrite $config_booleanize $config_read_hidden $config_fix_newlines $default_template_handler_func $php_handling $security $secure_dir $security_settings $trusted_dir $left_delimiter $right_delimiter $compiler_class $request_vars_order $compile_id $use_sub_dirs $default_modifiers $default_resource_type 第十三章.方法 append append_by_ref assign assign_by_ref clear_all_assign clear_all_cache clear_assign clear_cache clear_compiled_tpl clear_config config_load display fetch get_config_vars get_registered_object get_template_vars is_cached load_filter register_block register_compiler_function register_function register_modifier register_object register_outputfilter register_postfilter register_prefilter register_resource trigger_error template_exists unregister_block unregister_compiler_function unregister_function unregister_modifier unregister_object unregister_outputfilter unregister_postfilter unregister_prefilter unregister_resource 第十四章.缓存 Setting Up Caching Multiple Caches Per Page Cache Groups Controlling Cacheability of Plugins' Output 第十五章.高级特点 Objects Prefilters Postfilters Output Filters Cache Handler Function Resources Templates from $template_dir Templates from any directory Templates from other sources Default template handler function 第十六章.以插件扩展Smarty How Plugins Work Naming Conventions Writing Plugins Template Functions Modifiers Block Functions Compiler Functions Prefilters/Postfilters Output Filters Resources Inserts Ⅳ.高级特点第十七章.疑难解答 Smarty/PHP errors 第18章.使用技巧和经验 Blank Variable Handling Default Variable Handling Passing variable title to header template Dates WAP/WML Componentized Templates Obfuscating E-mail Addresses 第十九章. 相关资源第二十章. 漏洞

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Controlling Cacheability of Plugins' Output控制插件输出的缓冲能力

Since Smarty-2.6.0 plugins the cacheability of plugins can be declared when registering them. The third parameter to register_block, register_compiler_function and register_function is called $cacheable and defaults to true which is also the behaviour of plugins in Smarty versions before 2.6.0

自从Smarty-2.6.0插件以来，如果注册它们，则插件的缓存能力能够被重新声明的。register_block，register_compiler_function 和register_function的第3个参数就是$cacheable ,并且它的值默认为true。当然，在2.6.0版本之前它的默认值也是这样的。

When registering a plugin with $cacheable=false the plugin is called everytime the page is displayed, even if the page comes from the cache. The plugin function behaves a little like an insert function.

当用$cacheable=false来这册一个插件，则每次这个页面被输出的时候，这个插件就会被使用，即使这个页面来自缓存。这个插件函数的行为有点像这个函数insert。

In contrast to {insert} the attributes to the plugins are not cached by default. They can be declared to be cached with the fourth parameter $cache_attrs. $cache_attrs is an array of attribute-names that should be cached, so the plugin-function get value as it was the time the page was written to cache everytime it is fetched from the cache.

和{insert}相反，插件的属性默认是不缓存的。通过使用第四个参数$cache_attrs，它们能够被重新声明为缓存的。$cache_attrs是一个属性名字的数组，可以被缓存，所以每次当它被从缓存中取出的时候，这个插件函数获得值-----因为这个页面会被写入用来缓存。

Example 14-10. Preventing a plugin's output from being cached

例14-10.阻止插件从缓存中输出

index.php:

require('Smarty.class.php');
$smarty = new Smarty;
$smarty->caching = true;

function remaining_seconds($params, &$smarty) {
 $remain = $params['endtime'] - time();
 if ($remain >=0)
 return $remain . " second(s)";
 else
 return "done";
}

$smarty->register_function('remaining', 'remaining_seconds', false, array('endtime'));

if (!$smarty->is_cached('index.tpl')) {
 // fetch $obj from db and assign...
 $smarty->assign_by_ref('obj', $obj);
}

$smarty->display('index.tpl');


index.tpl:

Time Remaining: {remain endtime=$obj->endtime}

The number of seconds till the endtime of $obj is reached changes on each display of the page, even if the page is cached. Since the endtime attribute is cached the object only has to be pulled from the database when page is written to the cache but not on subsequent requests of the page.

直到$obj运行结束，时间的秒数在每一个页面输出的时候会改变，即使这个页面被缓存。只要结束时间属性被缓存，当页面被写入到缓存但是没有对这个页面接着的请求的时候对象只是不得不重新从数据库里取出而已。

Example 14-11. Preventing a whole passage of a template from being cached

例14-11.阻止一个模板文件的 整篇被缓存

index.php:

require('Smarty.class.php');
$smarty = new Smarty;
$smarty->caching = true;

function smarty_block_dynamic($param, $content, &$smarty) {
 return $content;
}
$smarty->register_block('dynamic', 'smarty_block_dynamic', false);

$smarty->display('index.tpl');


index.tpl:

Page created: {"0"|date_format:"%D %H:%M:%S"}

{dynamic}

Now is: {"0"|date_format:"%D %H:%M:%S"}

... do other stuff ...

{/dynamic}

When reloading the page you will notice that both dates differ. One is "dynamic" one is "static". You can do everything between {dynamic}...{/dynamic} and be sure it will not be cached like the rest of the page.

当重新加载这个页面，你将会注意到这两个日期不同。一个是“动态“，一个是“静态”。你能够在{dynamic}...{/dynamic}之间作任何事情，并且保证它将不会像剩下的页面一样被缓存。

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