FOS\UserBundle\Model\UserManagerInterface::findUsers PHP Method

    function findUsers();

 /**
  * Returns all users in a single collection resource.
  *
  * @param string[] $options
  *
  * @return Resource
  */
 public function getCollection(array $options = array())
 {
     /** @var UserEntity[] $collection */
     $collection = $this->userManager->findUsers();
     $resource = new Resource($this->generateBrowseUrl(), array('count' => count($collection)));
     foreach ($collection as $element) {
         $resource->setEmbedded('user', $this->createResourceFromUser($element));
     }
     return $resource;
 }