<?php
abstract class SQL {
	public abstract function connect($host, $user, $password, $database);
	public abstract function query($query);
	public abstract function fetch_array($resource);
	public abstract function fetch_assoc($resource);
	public abstract function fetch_object($resource);
	public abstract function fetch_row($resource);
	public abstract function affected_rows();
}
?>

SQL::connect($host...) {
  // we make our class here
}