To delete from the cache the cache item set with cache_set($cache_id, $temp_data, 'cache', CACHE_TEMPORARY);
it's enough to call cache_clear_all($cache_id, 'cache');
. Despite the name, cache_clear_all()
doesn't necessarily clear all the cache; it does so only when no parameter is passed to the function.
Usually Drupal core uses cache_clear_all()
to clear all the cache. In some cases, it uses that function to clear a specific cache item, which is what Drupal core does in variable_set()
.
function variable_set($name, $value) {
global $conf;
db_merge('variable')->key(array('name' => $name))
->fields(array('value' => serialize($value)))
->execute();
cache_clear_all('variables', 'cache_bootstrap');
$conf[$name] = $value;
}
In that code, the deleted cache item is the one whose cache ID is variables, contained in the cache_bootstrap cache bin.