PDO class

config.live.php

<?php 
define("DBHOST", "");
define("DBNAME", "");
define("DBUSER", "");
define("DBPASS", "");
?>

database.class.php

<?php 
require("config.live.php");

class Database {
    private static $db;  
    private function __construct(){} 
    private function __clone(){}

    public static function get_instance(){      
        if (! self::$db){
            try{
                global $dbhost, $dbname, $dbuser, $dbpass;
                self::$db = new PDO("mysql:host=" . DBHOST . ";dbname=" . DBNAME . "", DBUSER, DBPASS, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
                self::$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
            }
            catch(PDOException $e){
                die($e->getMessage());
            }
        }
        return self::$db;
    }
}
?>