interface DatabaseFactoryInterface { public function createConnection(): PDO; } class MysqlDatabaseFactory implements DatabaseFactoryInterface { public function createConnection(): PDO { return new PDO('mysql:host=localhost;dbname=my_database', 'username', 'password'); } } class PostgresqlDatabaseFactory implements DatabaseFactoryInterface { public function createConnection(): PDO { return new PDO('pgsql:host=localhost;dbname=my_database', 'username', 'password'); } } $factory = new MysqlDatabaseFactory(); $connection = $factory->createConnection();In this example, we define an interface for creating database connections called "DatabaseFactoryInterface". We then create two database factories for MySQL and PostgreSQL, both implementing the interface. These factories define how to create a new PDO instance with the appropriate connection details. Finally, we create an instance of the MySQL factory and use it to create a new database connection object. This PHP Database Factory pattern can be found in the popular PHP package library, "PHP Design Patterns".