Compiler functions are called only during compilation of the template. They are useful for injecting PHP code or time-sensitive static content into the template. If there is both a compiler function and a custom function registered under the same name, the compiler function has precedence.
編譯函數僅在模板編譯過程中被調用。對於將PHP代碼或對時間敏感的靜態內容嵌入到模板中，他們是比較有用的。如果編譯函數和普通函數都註冊了同一個名字，則編譯函數具有優先使用權。
mixed smarty_compiler_name(string $tag_arg, object &$smarty)
The compiler function is passed two parameters: the tag argument string - basically, everything from the function name until the ending delimiter, and the Smarty object. It's supposed to return the PHP code to be injected into the compiled template.
此編譯函數有兩個參數：標記參數字符串——基本上是從函數名字直到結束位置的所有內容，另一個參數是Smarty對象。該函數將返回嵌入到被編譯模板中的PHP代碼。
See also register_compiler_function(), unregister_compiler_function().
Example 16-6. simple compiler function簡單編譯函數
<?php
/*
* Smarty plugin
* -------------------------------------------------------------
* File: compiler.tplheader.php
* Type: compiler
* Name: tplheader
* Purpose: Output header containing the source file name and
* the time it was compiled.
* -------------------------------------------------------------
*/
function smarty_compiler_tplheader($tag_arg, &$smarty)
{
return "/necho '" . $smarty->_current_file . " compiled at " . date('Y-m-d H:M'). "';";
}
?>
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This function can be called from the template as:
這個函數在模板中以如下方式調用：
{* this function gets executed at compile time only *}
{tplheader}
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The resulting PHP code in the compiled template would be something like this:
在編譯之後的模板中被嵌入的PHP代碼內容如下：
<php
echo 'index.tpl compiled at 2002-02-20 20:02';
?>
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