PHP DBlib PDO Issue - php

Question

I am trying to connect to an MSSQL server through php but my pdo connection is giving me a hard time and errors that I don't really understand. The code I pasted below was working just fine a week ago and all of a sudden it just stopped without anyone changing anything. I can still connect to the server and run queries directly from the command line but I'm not having the same luck within php.
Anyone see something that I am missing? I spent too much time on this already and it seems like I'm running in circles.
First, this is the error I am getting from my PDOException
SQLSTATE[] (null) (severity 0)
Part of my Mssql()
private function __construct() {
try{
$this->_pdo = new PDO('dblib:host=' . Config::get('prod/host') . ':'. Config::get('prod/port') .';dbname=' . Config::get('prod/db'),Config::get('prod/username'), Config::get('prod/password'));
}catch(PDOException $e){
die($e->getMessage());
}
}
public static function getInstance(){
// Already an instance of this? Return, if not, create.
if (!isset(self::$instance)) {
self::$instance = new Mssql();
}
return self::$instance;
} //...This function is working and directs to __construct()
How I am calling it
/*Some random php file*/
function getClients(){
$conn = Mssql::getInstance();
//.....
And my init.php
//...
prod' => array(
'host' => 'xxxxxxx',
'port' => '1433',
'username' => 'xxxxxxx',
'password' => 'xxxxxx',
'db' => 'xxxxxxx'
),
//.....

Answer 1

We changed from using dblib to odbc and the code in my class changed to this:
private function __construct() {
putenv('ODBCSYSINI=/etc');
putenv('ODBCINI=/etc/odbc.ini');
$username = "xxxx";
$password = "xxxx";
try {
$this->_pdo = new PDO("odbc:production","$username","$password");
} catch (PDOException $exception) {
die($exception->getMessage());
}