Rebuild data based upon refreshed caches.
This hook allows your module to rebuild its data based on the latest/current module data. It runs after hook_cache_flush() and after all module data has been updated.
This hook is only invoked after the system has been completely cleared; i.e., all previously cached data is known to be gone and every API in the system is known to return current information, so your module can safely rely on all available data to rebuild its own.
The menu router is the only exception regarding rebuilt data; it is only rebuilt after all hook_rebuild() implementations have been invoked. That ensures that hook_menu() implementations and the final router rebuild can rely on all data being returned by all modules.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_rebuild() {
$themes = list_themes();
foreach ($themes as $theme) {
_block_rehash($theme->name);
}
}