在开启smarty缓存的情况下,第一次执行时会将其编译好的输出文件保存到cache目录中,然后在程序中通过smarty的is_cache()函数检测其 cache文件是否过期,如果过期会更新缓存,如果没有过期会自动调用cache文件,这样就省去了编译的过程。检测cache过期是看模板文件是否在指定的生命周期内是否更改,这里的更改是通过检测文件的最近修改时间实现的,不是通过检测模板文件内容。
防止一个模板文件的整篇都被缓存:
index.php文件:
$smarty = new smarty;
$smarty->caching = true;
function smarty_block_dynamic($param, $content, &$smarty) {
return $content;
}
$smarty->register_block('dynamic', 'smarty_block_dynamic', false);
$smarty->display('index.tpl');
index.tpl:
{dynamic}
now is: {"0"|date_format:"%d %h:%m:%s"}
... do other stuff ...
{/dynamic}
当重新加载这个页面,你将会注意到这两个日期不同。一个是“动态“,一个是“静态”。你能够在{dynamic}...{/dynamic}之间作任何事情,并且保证它将不会像剩下的页面一样被缓存。

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