You can also pass a $cache_id as an optional second
parameter in case you want
multiple caches
for the given template.
You can supply a
$compile id
as an optional third parameter. If you omit that parameter the persistent
$compile_id is used if its set.
If you do not want to pass a $cache_id but want to
pass a $compile_id you have to pass
NULL as a $cache_id.
Technical Note:
If is_cached() returns TRUE it actually loads the
cached output and stores it internally. Any subsequent call to
display() or
fetch()
will return this internally stored output and does not try to reload
the cache file. This prevents a race condition that may occur when a
second process clears the cache between the calls to
is_cached() and to
display()
in the example above. This also means calls to
clear_cache()
and other changes of the cache-settings may have no effect after
is_cached() returned TRUE.
Example 13-1. is_cached()
<?php $smarty->caching = true;
if(!$smarty->is_cached('index.tpl')) { // do database calls, assign vars here }
$smarty->display('index.tpl'); ?>
Example 13-2. is_cached() with multiple-cache template
<?php $smarty->caching = true;
if(!$smarty->is_cached('index.tpl', 'FrontPage')) { // do database calls, assign vars here }
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