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-Multiple Caches Per Page {#caching.multiple.caches}
-========================
-
-You can have multiple cache files for a single call to
-[`display()`](#api.display) or [`fetch()`](#api.fetch). Let\'s say that
-a call to `display('index.tpl')` may have several different output
-contents depending on some condition, and you want separate caches for
-each one. You can do this by passing a `$cache_id` as the second
-parameter to the function call.
-
-
-    <?php
-    require('Smarty.class.php');
-    $smarty = new Smarty;
-
-    $smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);
-
-    $my_cache_id = $_GET['article_id'];
-
-    $smarty->display('index.tpl', $my_cache_id);
-    ?>
-
-         
-
-Above, we are passing the variable `$my_cache_id` to
-[`display()`](#api.display) as the `$cache_id`. For each unique value of
-`$my_cache_id`, a separate cache will be generated for `index.tpl`. In
-this example, `article_id` was passed in the URL and is used as the
-`$cache_id`.
-
-> **Note**
->
-> Be very cautious when passing values from a client (web browser) into
-> Smarty or any PHP application. Although the above example of using the
-> article\_id from the URL looks handy, it could have bad consequences.
-> The `$cache_id` is used to create a directory on the file system, so
-> if the user decided to pass an extremely large value for article\_id,
-> or write a script that sends random article\_id\'s at a rapid pace,
-> this could possibly cause problems at the server level. Be sure to
-> sanitize any data passed in before using it. In this instance, maybe
-> you know the article\_id has a length of ten characters and is made up
-> of alpha-numerics only, and must be a valid article\_id in the
-> database. Check for this!
-
-Be sure to pass the same `$cache_id` as the second parameter to
-[`isCached()`](#api.is.cached) and [`clearCache()`](#api.clear.cache).
-
-
-    <?php
-    require('Smarty.class.php');
-    $smarty = new Smarty;
-
-    $smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);
-
-    $my_cache_id = $_GET['article_id'];
-
-    if(!$smarty->isCached('index.tpl',$my_cache_id)) {
-        // No cache available, do variable assignments here.
-        $contents = get_database_contents();
-        $smarty->assign($contents);
-    }
-
-    $smarty->display('index.tpl',$my_cache_id);
-    ?>
-
-         
-
-You can clear all caches for a particular `$cache_id` by passing NULL as
-the first parameter to [`clearCache()`](#api.clear.cache).
-
-
-    <?php
-    require('Smarty.class.php');
-    $smarty = new Smarty;
-
-    $smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);
-
-    // clear all caches with "sports" as the $cache_id
-    $smarty->clearCache(null,'sports');
-
-    $smarty->display('index.tpl','sports');
-    ?>
-
-         
-
-In this manner, you can "group" your caches together by giving them the
-same `$cache_id`.