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Smarty模板编译引擎 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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Multiple Caches Per Page 每页多个缓存

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.
你可以用单个函数display()或fetch()来输出多个缓存文档。display('index.tpl')在多种条件下会有不同的输出内容,要单独的把缓存分开。可以通过函数的第二参数cache_id来达到效果。

Example 14-6. passing a cache_id to display()
例14-6.传给display()一个cache_id

require('Smarty.class.php');
$smarty = new Smarty;

$smarty->caching = true;

$my_cache_id = $_GET['article_id'];

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

Above, we are passing the variable $my_cache_id to display() as the cache_id. For each unique value of $my_cache_id, a separate cache will be generated for index.tpl. In this example, "article_id" was passed in the URL and is used as the cache_id.
上面,我们通过变量$my_cache_id作为cache_id来display()。在index.tpl里$my_cache_id的每个唯一值,会建立单独的缓存。在这个例子里,"article_id"在URL传送,并用作cache_id。

Technical Note: 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!
技术提示:要注意从客户端(web浏览器)传值到Smarty(或任何PHP应用程序)的过程。尽管上面的例子用article_id从URL传值看起来很方便,却可能有糟糕的后果[安全问题]。cache_id被用来在文件系统里创建目录,如果用户想为article_id赋一个很大的值,或写一些代码来快速发送随机的article_ids,就有可能会使服务器出现问题。确定在使用它之前清空已存在的数据。在这个例子,可能你知道article_id的长度(值吧?!)是10字符,并只由字符-数字组成,在数据库里是个可用的article_id。Check for this!要注意检查这个问题!〔要注意这个提示!不用再说了吧?〕

Be sure to pass the same cache_id as the second parameter to is_cached() and clear_cache().
确定传给is_cached()和clear_cache()的第二参数是同一个cache_id。

Example 14-7. passing a cache_id to is_cached()
例14-7.传给is_cached()一个cache_id

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);

You can clear all caches for a particular cache_id by passing null as the first parameter to clear_cache().
你可以通过把clear_cache()的第一参数设为null来为特定的cache_id清除所有缓存。

Example 14-8. clearing all caches for a particular cache_id
例14-8.为特定的cache_id清除所有缓存

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");

In this manner, you can "group" your caches together by giving them the same cache_id.
通过这种方式,你可以用相同的cache_id来把你的缓存集合起来。

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