public static function getInstance()
{
if (self::$_db == null) {
try {
self::$_db = new PDO('mysql:host=' . self::DB_HOST . ';dbname=' . self::DB_NAME, self::DB_USER, self::DB_PASS);
} catch (PDOException $e) {
die('<h1>Sorry. The Database connection is temporarily unavailable.</h1>');
}
return self::$_db;
} else {
return self::$_db;
}
}