DB connection

<?php
$db_host = 'IP address'; // Server Name
$db_user = '    '; // Username
$db_pass = '    '; // Password
$db_name = '    '; // Database Name

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);
if (!$conn) {
    die ('Failed to connect to MySQL: ' . mysqli_connect_error());
}

$sql = 'SELECT *
        FROM groupa';

$query = mysqli_query($conn, $sql);

if (!$query) {
    die ('SQL Error: ' . mysqli_error($conn));
}
?>