public ModuleHandler::getHookInfo() Retrieves

List of loaded files. An associative array whose keys are file paths of loaded files, relative to the application's root directory.

public ModuleHandler::loadAll() Loads

protected ModuleHandler::buildImplementationInfo($hook)

The app root. Type: string File core/lib/Drupal/Cor

Cache backend for storing module hook implementation information. Type:

public ModuleHandler::getModule($name)

public ModuleHandler::writeCache() Write

List of alter hook implementations keyed by hook name(s). Type:

public ModuleHandler::alter($type, &$data, &$context1 = NULL