在这种情况下如何聪明地使用缓存

Question

if(!$smarty->isCached("sidebar.tpl")){
$tags = $tagService->tagList();
$categories = $categoryService->categoryList();
$sidebarData = $smarty->createData();
$sidebarData->assign("tags", $tags);
$sidebarData->assign("categories", $categories);
$smarty->setCacheLifetime(3600*24);
$sidebarHtml = $smarty->fetch("sidebar.tpl", $sidebarData);

}

I want assign $sidebarHtml to another Template, bu it seems dosen't work, I can get $sidebarHtml, through:
$smarty->fetch("sidebar.tpl")
I need $tags and $categories for 'sidebar.tpl'
or
$smarty->fetch("sidebar.tpl", $sidebarData);
the $sidebarData is undefined

how to deal in this case

Answer 1

This page: http://www.smarty.net/docs/en/api.is.cached.tpl

Shows this example:
<?php
$smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);

if(!$smarty->isCached('index.tpl')) {
// do database calls, assign vars here
}

$smarty->display('index.tpl');
?>

So in your case you should put the fetch after the closing } of the iscached's if.