PHP7中文手册2018 带注释 最新chm版
smarty模板中select选值使用html_options标签：
<select name=customer_id>
{html_options options=$cust_options selected=$customer_id}
</select>
实例：
后台文件：out.php
require('Smarty.php.class');
$smarty = new Smarty;
$smarty->assign('cust_options', array(
1001 => 'Joe Schmoe',
1002 => 'Jack Smith',
1003 => 'Jane Johnson',
1004 => 'Charlie Brown'));
$smarty->assign('customer_id', 1001);
$smarty->display('out.tpl');模板文件：out.tpl
<select name=customer_id>
{html_options options=$cust_options selected=$customer_id}
</select>注意说明：$customer_id一定是数组中某个元素的键名，不是元素值
模板解析之后：
<select name=customer_id> <option value="1000">Joe Schmoe</option> <option value="1001" selected="selected">Jack Smith</option> <option value="1002">Jane Johnson</option> <option value="1003">Charlie Brown</option> </select>