Description
bool
is_cached ( string template [, string cache_id [, string compile_id]])
This only works if $caching is set to true. See also the
caching section.
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');
?>
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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 you do not want to pass a cache id but want to pass a
$compile_id
you have to pass null as cache id.
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
}
$smarty->display('index.tpl', 'FrontPage');
?>
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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.
See also
clear_cache(),
clear_all_cache(),
and
caching section.
