$dbName = "peoples";
  $tableName = "peoples";
  $idColumn = "id";
  $firstnameColumn = "name";
  $lastnameColumn = "lastname";

$conn1 = new mysqli("localhost", "root", "my_password", $dbName);

/* проверка соединения */
if ($mysqli->connect_errno) {
    printf("Не удалось подключиться: %s\n", $conn1->connect_error);
    exit();
}

$query = "select * from ".$tableName." where ".$idColumn."='".$id."'";
$result = $conn1->query($query);
while($row2 = mysqli_fetch_assoc($result))
{
$record[]=$row2;
}
print_r(json_encode($record));