empty set query

["J. Connolly" <web@xxxxxxxxxx>]

I have a query which can result in an empty set/ no matching records. 
The code I have which returns a code is:

$result = mysqli_query($link, $sql);
   while ($query = mysqli_fetch_array($result)){
   $title = $query['title'];
   $director = $query['director'];
   echo "<table><tr><td>$title</td><td> $director</td></tr></table>\n";
     }

If the resulting query is a empty set, which variable or item to I 
refence as null.  I already tried
  
   if (!query) and (!$title)

and neither of them work. I also tried if either of them are null. I 
don't need someone to give me a long explanation just a small bump as to 
what I should be referencing. In other words, what is it that I should 
reference? Should I just write a code that returns number of rows  and 
use that?

Jzf

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