How do I count query result rows?

Question

What should I replace \'CODE TO VERIFY IF QUERY RESULT ROW IS = 1\' for?
I\'ve tried many ways using num_rows but it won\'t work.

My PHP code:

Answer 1

You can use:

$stmt=$mysqli->prepare("select `id` from `agahicustomer` where `city`=?");
    $stmt->bind_param("s",$cityid);
    $stmt->execute();
    $stmt->store_result();
    $stmt->bind_result($id);
    return $stmt->affected_rows;
    $stmt->close();