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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 arraysArray indexesObjects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}{$smarty.template}第五章.变量调节器capitalizecount_characterscatcount_paragraphscount_sentencescount_wordsdate_formatdefaultescapeindentlowernl2brregex_replacereplacespacifystring_formatstripstrip_tagstruncateupperwordwrap第六章.组合修改器第七章.内建函数captureconfig_loadforeachincludeinclude_phpinsertifldelimliteralphpsectionindexindex_previndex_nextiterationfirstlastrownumloopshowtotalstrip第八章.自定义函数assigncountercycledebugevalfetchhtml_checkboxeshtml_imagehtml_optionshtml_radioshtml_select_datehtml_select_timehtml_tablemathmailtopopup_initpopuptextformat第九章.配置文件第十章.调试控制台III.模板程序员篇第十一章 常量SMARTY_DIR第十二章 变量$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appendappend_by_refassignassign_by_refclear_all_assignclear_all_cacheclear_assignclear_cacheclear_compiled_tplclear_configconfig_loaddisplayfetchget_config_varsget_registered_objectget_template_varsis_cachedload_filterregister_blockregister_compiler_functionregister_functionregister_modifierregister_objectregister_outputfilterregister_postfilterregister_prefilterregister_resourcetrigger_errortemplate_existsunregister_blockunregister_compiler_functionunregister_functionunregister_modifierunregister_objectunregister_outputfilterunregister_postfilterunregister_prefilterunregister_resource第十四章.缓存Setting Up CachingMultiple Caches Per PageCache GroupsControlling Cacheability of Plugins' Output第十五章.高级特点ObjectsPrefiltersPostfiltersOutput FiltersCache Handler FunctionResourcesTemplates from $template_dirTemplates from any directoryTemplates from other sourcesDefault template handler function第十六章.以插件扩展SmartyHow Plugins WorkNaming ConventionsWriting PluginsTemplate FunctionsModifiersBlock FunctionsCompiler FunctionsPrefilters/PostfiltersOutput FiltersResourcesInsertsⅣ.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 HandlingDefault Variable HandlingPassing variable title to header templateDatesWAP/WMLComponentized TemplatesObfuscating E-mail Addresses第十九章. 相关资源第二十章. 漏洞
文字

Chapter 18. Tips & Tricks

第18章。使用技巧和经验

Table of Contents
[内容列表]
Blank Variable Handling[空白变量处理]
Default Variable Handling[默认变量处理]
Passing variable title to header template[把变量型标题传递到头模板]
Dates[日期]
WAP/WML[WAP/WML]
Componentized Templates[组合的模板]
Obfuscating E-mail Addresses[拒绝电子邮件地址]

Blank Variable Handling

空白变量处理

 

There may be times when you want to print a default value for an empty variable instead of printing nothing, such as printing " " so that table backgrounds work properly. Many would use an {if} statement to handle this, but there is a shorthand way with Smarty, using the default variable modifier.

也许有时候你想给一个没有赋值的变量输出一个默认的值来代替什么也不输出,比如输出' '[这是一个空格符号,HTML里的标记]来使得表格里的背景能够正常工作。大多数人使用{if}语句来处理这些,但是用Smatry这里有一个捷径,那就是使用 default [默认的]值赋给变量。

Example 18-1. Printing   when a variable is empty

例 18-1。输出 ---如果一个变量是空值

{* the long way *}

{if $title eq ""}
	 
{else}
	{$title}
{/if}


{* the short way *}

{$title|default:" "}
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