<?php

define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'username');
define('DB_PASSWORD', 'password');
define('DB_DATABASE', 'databasename');


function getDB()
{
  $dbhost=DB_SERVER;
  $dbuser=DB_USERNAME;
  $dbpass=DB_PASSWORD;
  $dbname=DB_DATABASE;
  try {
    $dbConnection = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser, $dbpass);
    $dbConnection->exec("set names utf8");
    $dbConnection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    return $dbConnection;
  }
  catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
  }

}

$db = getDB();
$stmt = $db->prepare("SELECT nome_banco FROM bancos");
$stmt->execute();
$data = $stmt->fetch(PDO::FETCH_OBJ);
$retorno = implode(',', $data);
echo $retorno;
?>