Instagram\Instagram::searchTags PHP Method

    public function searchTags($query)
    {
        if (!$this->isLoggedIn()) {
            throw new InstagramException("You must be logged in to call searchTags().");
        }
        $request = new SearchTagsRequest($this, $query);
        $response = $request->execute();
        if (!$response->isOk()) {
            throw new InstagramException(sprintf("Failed to searchTags: [%s] %s", $response->getStatus(), $response->getMessage()));
        }
        return $response;
    }

 public function getByHash($hashtag)
 {
     if ($data = current($this->client->searchTags($hashtag)->getData())) {
         $data = $data->getMedia()->getData();
     }
     return $this->formatter->format($data);
 }