如何在smarty模板语言中使用php代码

load_nav.php
-------------

<?php

	// load in variables from a mysql db and assign them to the template
	// 从mysql数据库中取得数据，将数据赋给模板变量
	require_once("MySQL.class.php");
	$sql = new MySQL;
	$sql->query("select * from site_nav_sections order by name",SQL_ALL);
	$this->assign(&#39;sections&#39;,$sql->record);

?>


index.tpl
---------

{* absolute path, or relative to $trusted_dir *}
{* 绝对路径或 $trusted_dir 的相对路径 *}
{include_php file="/path/to/load_nav.php"}

{foreach item="curr_section" from=$sections}
	<a href="{$curr_section.url}">{$curr_section.name}</a><br>
{/foreach}

{php}
		// including a php script directly
		// from the template.
		include("/path/to/display_weather.php");
{/php}