Controlling Cacheability of Plugins' Output控制插件输出的缓冲能力

Since Smarty-2.6.0 plugins the cacheability of plugins can be declared when registering them. The third parameter to register_block, register_compiler_function and register_function is called $cacheable and defaults to true which is also the behaviour of plugins in Smarty versions before 2.6.0

自从Smarty-2.6.0插件以来，如果注册它们，则插件的缓存能力能够被重新声明的。register_block，register_compiler_function 和register_function的第3个参数就是$cacheable ,并且它的值默认为true。当然，在2.6.0版本之前它的默认值也是这样的。

When registering a plugin with $cacheable=false the plugin is called everytime the page is displayed, even if the page comes from the cache. The plugin function behaves a little like an insert function.

当用$cacheable=false来这册一个插件，则每次这个页面被输出的时候，这个插件就会被使用，即使这个页面来自缓存。这个插件函数的行为有点像这个函数insert。

In contrast to {insert} the attributes to the plugins are not cached by default. They can be declared to be cached with the fourth parameter $cache_attrs. $cache_attrs is an array of attribute-names that should be cached, so the plugin-function get value as it was the time the page was written to cache everytime it is fetched from the cache.

和{insert}相反，插件的属性默认是不缓存的。通过使用第四个参数$cache_attrs，它们能够被重新声明为缓存的。$cache_attrs 是一个属性名字的数组，可以被缓存，所以每次当它被从缓存中取出的时候，这个插件函数获得值-----因为这个页面会被写入用来缓存。

index.php:

require('Smarty.class.php');
$smarty = new Smarty;
$smarty->caching = true;

function remaining_seconds($params, &$smarty) {
    $remain = $params['endtime'] - time();
    if ($remain >=0)
        return $remain . " second(s)";
    else
        return "done";
}

$smarty->register_function('remaining', 'remaining_seconds', false, array('endtime'));

if (!$smarty->is_cached('index.tpl')) {
    // fetch $obj from db and assign...
    $smarty->assign_by_ref('obj', $obj);
}

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


index.tpl:

Time Remaining: {remain endtime=$obj->endtime}

index.php:

require('Smarty.class.php');
$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:

Page created: {"0"|date_format:"%D %H:%M:%S"}

{dynamic}

Now is: {"0"|date_format:"%D %H:%M:%S"}

... do other stuff ...

{/dynamic}

When reloading the page you will notice that both dates differ. One is "dynamic" one is "static". You can do everything between {dynamic}...{/dynamic} and be sure it will not be cached like the rest of the page.

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。