Warning: mysqli_query(): Couldn't fetch mysqli

Question

I have a problem where I can not retrieve the result from my MySQL database (via PHP). I use the same function in other places and it works flawlessly. However at this point

Answer 1

You forgot the include your database connection. Just add the $connection to your sql query:

function getAllCountries()
{
    $result = db_query($connection,"SELECT countryid, name FROM country ORDER BY name ASC");

    // enter code here
}

Answer 2

I think it is because when you close the database connection the first time, you forget to do:

unset($connection);

And then when you try connecting to the database again, it craps out because it is still set to the closed connection.