Alter the entity info.
Modules may implement this hook to alter the information that defines an entity. All properties that are available in hook_entity_info() can be altered here.
$entity_info: The entity info array, keyed by entity name.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_entity_info_alter(&$entity_info) {
// Set the controller class for nodes to an alternate implementation of the
// DrupalEntityController interface.
$entity_info['node']['controller class'] = 'MyCustomNodeController';
}