connection.php

<?php

    $dbhost = "localhost";
    $dbuser = "root";
    $dbpass = "";
    $dbname = "demo";

    $conn = new mysqli($dbhost, $dbuser, $dbpass, $dbname);

    $db_connected;

    if($conn->connect_error) {
        echo "Database does not exist <br \><br \>";
        return false;
    } else {
        echo "Database exists and is connected <br \><br \>";
        return true;
    }

    echo $db_connected;

?>