function DB_fetch_array($query)
{
	return mysqli_fetch_array($query);
}

// When I call this, I get the following warning (which I consider an error): "PHP Warning:  mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given".

I call it with:

$query = DB_query('SELECT * FROM test'); // DB_query() is exactly like the function I show here but with mysqli_query().
$i = $DB_fetch_array($query);