isCached() — returns true if there is a valid cache for this template
bool isCached(string template,
string cache_id,
string compile_id);
This only works if
$caching is set to one of Smarty::CACHING_LIFETIME_CURRENT or Smarty::CACHING_LIFETIME_SAVED to enable caching. See the
caching section for more info.
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.
If isCached() 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
isCached() and to
display()
in the example above. This also means calls to
clearCache()
and other changes of the cache-settings may have no effect after
isCached() returned TRUE.
Example 14.32. isCached()
<?php
$smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);
if(!$smarty->isCached('index.tpl')) {
// do database calls, assign vars here
}
$smarty->display('index.tpl');
?>
Example 14.33. isCached() with multiple-cache template
<?php
$smarty->setCaching(Smarty::CACHING_LIFETIME_CURRENT);
if(!$smarty->isCached('index.tpl', 'FrontPage')) {
// do database calls, assign vars here
}
$smarty->display('index.tpl', 'FrontPage');
?>
See also
clearCache(),
clearAllCache(),
and
caching section.