如何从mysql查询中回显结果行的各个列值？

下面的代码完美地工作,并给我“id”“firstname”和“lastname”.我想要的是使用循环来回显结果行中的所有字段值,而不必引用每个列名称

$row["id"]

下面是工作代码

<?PHP
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

 // Create connection
$conn = new MysqLi($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection Failed: " . $conn->connect_error);
} 

$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
    echo "<br> id: ". $row["id"]. " - Name: ". $row["firstname"]. " " . 
$row["lastname"] . "<br>";
}
} else {
echo "0 results";
}

$conn->close();
?> 

请问

解决方法:

这应该工作..

while($row = $result->fetch_array()) {
  $i=0;
  while($i<count($row)){
    echo $row[$i];
    $i++;
  }  
}