conn_db.php

<?php
/**
 * Created by PhpStorm.
 * User: Piotr
 * Date: 7/26/2017
 * Time: 4:17 PM
 */

$db_usr      = '';
$db_nm       = '';
$db_usr_pass = '';
$lhost       = '';

try{
    $conn = new PDO("mysql:host={$lhost};dbname={$db_nm}", $db_usr, $db_usr_pass);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}catch(PDOException $e){
    echo $e->getMessage();
}