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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`.