MySQL connection: globally or in object?

Question

I have two PHP classes. One is for connecting to the database, building queries, executing them, and disconnecting from the database. The other class is for users: adding th

Answer 1

Create a function that creates the connection on demand and provides access to the connection object:

function getDb()
{
    static $db;
    if (!$db) $db = ...;
    return $db;
}

Wrapped into class this approach is called Singleton