code: public function api($url, $body = null, $type = self::TYPE_POST)
      {
          $body['access_token'] = $this->accessToken;
  
          $this->setBody($body);
  
          $headers = [
              'Content-Type: application/json',
          ];
  
          if ($type == self::TYPE_GET) {
              $url .= '?'.http_build_query($body);
          }
  
          $curl = curl_init($this->url . $url);
  
          if($type == self::TYPE_POST) {
              curl_setopt($curl, CURLOPT_POST, 1);
              curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($body));
          }
  
          curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
          curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
          curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  
          $response = curl_exec($curl);
          curl_close($curl);
  
          return json_decode($response, true);
      }
docs: Request to Facebook API
  
  @param string $url Url
  @param array  $body Body
  @param string $type Request type (POST)
  
  @return array