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Cache Groups {#caching.groups}
============
You can do more elaborate grouping by setting up `$cache_id` groups.
This is accomplished by separating each sub-group with a vertical bar
`|` in the `$cache_id` value. You can have as many sub-groups as you
like.
- You can think of cache groups like a directory hierarchy. For
instance, a cache group of `'a|b|c'` could be thought of as the
directory structure `'/a/b/c/'`.
- `clearCache(null,'a|b|c')` would be like removing the files
`'/a/b/c/*'`. `clearCache(null,'a|b')` would be like removing the
files `'/a/b/*'`.
- If you specify a [`$compile_id`](#variable.compile.id) such as
`clearCache(null,'a|b','foo')` it is treated as an appended cache
group `'/a/b/c/foo/'`.
- If you specify a template name such as
`clearCache('foo.tpl','a|b|c')` then Smarty will attempt to remove
`'/a/b/c/foo.tpl'`.
- You CANNOT remove a specified template name under multiple cache
groups such as `'/a/b/*/foo.tpl'`, the cache grouping works
left-to-right ONLY. You will need to group your templates under a
single cache group hierarchy to be able to clear them as a group.
Cache grouping should not be confused with your template directory
hierarchy, the cache grouping has no knowledge of how your templates are
structured. So for example, if you have a template structure like
`themes/blue/index.tpl` and you want to be able to clear all the cache
files for the "blue" theme, you will need to create a cache group
structure that mimics your template file structure, such as
`display('themes/blue/index.tpl','themes|blue')`, then clear them with
`clearCache(null,'themes|blue')`.
<?php
require('Smarty.class.php');
$smarty = new Smarty;
$smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);
// clear all caches with 'sports|basketball' as the first two cache_id groups
$smarty->clearCache(null,'sports|basketball');
// clear all caches with "sports" as the first cache_id group. This would
// include "sports|basketball", or "sports|(anything)|(anything)|(anything)|..."
$smarty->clearCache(null,'sports');
// clear the foo.tpl cache file with "sports|basketball" as the cache_id
$smarty->clearCache('foo.tpl','sports|basketball');
$smarty->display('index.tpl','sports|basketball');
?>