//code for database_connection.php:
<?php

    $servername = "127.0.0.1:3306";
    $username = "root";
    $password = "-------";
    $database = "barDB";

    function db_connect() {
        $connection = new mysqli($servername, $username, $password,
$database);
        return $connection;
    }

    function db_disconenct() {
        if(isset($connection)) {
            $connection->close();
        }
    }
?>

//code for connecting to database_connection.php:

<?php
        require_once("database_connection.php");
        $db = db_connect();
?>