connect_error) {
  echo "Failed to connect to MySQL: " . $mysqli->connect_error;
}

// Query
$selectQuery = $mysqli->prepare("SELECT * FROM my_table");
$selectQuery->execute();
$selectQueryResult = $selectQuery->get_result();

// Loop 
while($selectQueryRow = $selectQueryResult->fetch_array()) {
  echo $selectQueryRow['my_column'];
}

// Example
$selectUsername = $mysqli->prepare("SELECT * FROM users");
$selectUsername->execute();
$selectUsernameResult = $selectUsername->get_result();
while($selectUsernameRow = $selectUsernameResult->fetch_array()) {
  echo $selectUsernameRow['username'];
}