mysqli : mysqli_result could not be converted to string

Question

I know there have been asked lots of similair questions like this one, but I just can\'t translate it to my problem so thats why I ask again. The code used to work fine but

Answer 1

$num=$result->num_rows;

echo "Database Output

";

while ($row = $result->fetch_assoc()) {  

   echo "".$row['id']."".$row['first'].""; //etc...
 }

is much easier.