What is the alternative for Fatal error: Uncaught Error: Call to undefined method MongoDB\Driver\Cursor::hasNext?

One of my application using MongoDB Client library with old php version. I just upgraded my php version as well as upgraded mongo library. When following function is calling, it's giving me

Fatal error: Uncaught Error: Call to undefined method MongoDB\Driver\Cursor::hasNext

`function get_result_row () {

 if ($this->cursor->hasNext()) {
 return $this->cursor->getNext();
 }

}`

Please suggest how i can fix it?