如何在php中打印数组名称

Question

The array below won't fire I've been looking at this problem for hours and cannot seems to figure out how to print the names.

<div class="col-md-3 col-sm-3 col-xs-3">
    <?php 
         $listResult = executeQuery("SELECT fname, lname FROM SPIFF_log WHERE id = '" . $array[id] . "'") or die("Bad query");

         while ($listArray = $listResult->fetch_assoc()) {
               $string =  "<h4>". $listArray['fname'] . " " . $listArray['lname'] ."</h4>";

               echo "<p>Hello</p>" . $string . "";
                                        }
     ?>
</div>

I expect to return a string saying "Hello fname, lname".