Flarum\Extension\ExtensionManager::getExtension PHP Метод

    public function getExtension($name)
    {
        return $this->getExtensions()->get($name);
    }

 protected function delete(ServerRequestInterface $request)
 {
     $this->assertAdmin($request->getAttribute('actor'));
     $name = array_get($request->getQueryParams(), 'name');
     $extension = $this->extensions->getExtension($name);
     $this->extensions->disable($extension);
     $this->extensions->uninstall($extension);
 }