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Smarty模板編譯引擎 序 I.開始 第一章. 什么是Smarty? 第二章. 安裝 要求 基本安裝 擴展設置 II.模板設計者篇 第三章.基本語法 注釋 函數(shù) 屬性 第四章.變量 從PHP分配的變量 Associative arrays Array indexes Objects 從配置文件讀取的變量 {$smarty}保留變量 Request variables {$smarty.now} {$smarty.const} {$smarty.capture} {$smarty.config} {$smarty.section} {$smarty.template} 第五章.變量調(diào)節(jié)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.組合修改器 第七章.內(nèi)建函數(shù) 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.自定義函數(shù) 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.調(diào)試控制臺 III.模板程序員篇 第十一章 常量 SMARTY_DIR 第十二章 變量 $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.緩存 Setting Up Caching Multiple Caches Per Page Cache Groups Controlling Cacheability of Plugins' Output 第十五章.高級特點 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.以插件擴展Smarty How Plugins Work Naming Conventions Writing Plugins Template Functions Modifiers Block Functions Compiler Functions Prefilters/Postfilters Output Filters Resources Inserts Ⅳ.高級特點 第十七章.疑難解答 Smarty/PHP errors 第18章.使用技巧和經(jīng)驗 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. 相關資源 第二十章. 漏洞
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math

Attribute Name Type Required Default Description
equation string Yes n/a the equation to execute
format string No n/a the format of the result (sprintf)
var numeric Yes n/a equation variable value
assign string No n/a template variable the output will be assigned to
[var ...] numeric Yes n/a equation variable value

屬性 類型 是否必須 缺省值 描述
equation string Yes n/a 待執(zhí)行的表達式
format string No n/a 結(jié)果的格式(遵從sprintf函數(shù))
var numeric Yes n/a 表達式變量值
assign string No n/a 輸出值將被賦給模板變量的名稱
[var ...] numeric Yes n/a 表達式變量值

math allows the template designer to do math equations in the template. Any numeric template variables may be used in the equations, and the result is printed in place of the tag. The variables used in the equation are passed as parameters, which can be template variables or static values. +, -, /, *, abs, ceil, cos, exp, floor, log, log10, max, min, pi, pow, rand, round, sin, sqrt, srans and tan are all valid operators. Check the PHP documentation for further information on these math functions.

math 允許模板設計者在模板中進行數(shù)學表達式運算. 均表達式中可以使用任何數(shù)值類型的變量，結(jié)果在 math 標簽的位置輸出. 表達式中使用的變量被當做參數(shù)傳遞給函數(shù)，可以是模板變量或靜態(tài)值. 目前可以使用的運算符有:+, -, /, *, abs, ceil, cos, exp, floor, log, log10, max, min, pi, pow, rand, round, sin, sqrt, srans 和 tan .關于數(shù)學函數(shù)的詳細信息，請查看 PHP 文檔.

If you supply the special "assign" attribute, the output of the math function will be assigned to this template variable instead of being output to the template.

如果指定了 "assign" 這個特殊屬性，該函數(shù)的輸出值將被賦給由 assign 指定的模板變量，而不是直接輸出.

Technical Note: math is an expensive function in performance due to its use of the php eval() function. Doing the math in PHP is much more efficient, so whenever possible do the math calculations in PHP and assign the results to the template. Definately avoid repetitive math function calls, like within section loops.

技術(shù)要點: 由于使用了 php 的 eval() 函數(shù)，math 函數(shù)的執(zhí)行效率不高. 在 PHP 中做數(shù)學運算效率會更高一些，因此要盡可能在 PHP 中做數(shù)學運算，將結(jié)果賦給模板變量. 類似在 section 循環(huán)，應明確避免反復調(diào)用 math 函數(shù).

Example 8-14. math
例 8-14. math 函數(shù)演示 

{* $height=4, $width=5 *}

{math equation="x + y" x=$height y=$width}

OUTPUT:

9


{* $row_height = 10, $row_width = 20, #col_div# = 2, assigned in template *}

{math equation="height * width / division"
 height=$row_height
 width=$row_width
 division=#col_div#}

OUTPUT:

100


{* you can use parenthesis *}

{math equation="(( x + y ) / z )" x=2 y=10 z=2}

OUTPUT:

6


{* you can supply a format parameter in sprintf format *}

{math equation="x + y" x=4.4444 y=5.0000 format="%.2f"}

OUTPUT:

9.44
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