function db()
{
    $host = "text";
    $user = "text";
    $password = "text";
    $database = "text";
    $db = mysqli_connect($host, $user, $password, $database);
    if(!$db)
    {
        die('OOOPS'.mysql_errno());
    }
    else{
        return $db;
    }
}

$host = "text";
$user = "text";
$password = "text";
$database = "text";
$db = mysqli_connect($host, $user, $password, $database);
if(!$db) {
    die('OOOPS'.mysqli_error());
}

$db = db();
mysqli_query($db, $query);