<?php
/**
* Factory method model
*
* define 1 Three interfaces for creating objects , Let the subclass decide which 1 Class instantiation , use 1 Class instantiation is deferred to its subclasses
*/
/*
class DBFactory
{
public static function create($type)
{
swtich($type)
{
case "Mysql":
return new MysqlDB(); break;
case "Postgre":
return new PostgreDB(); break;
case "Mssql":
return new MssqlDB(); break;
}
}
}
*/
class DBFactory
{
public static function create($type)
{
$class = $type."DB";
return new $class;
}
}
interface DB
{
public function connect();
public function exec();
}
class MysqlDB implements DB
{
public function __construct() {
echo "mysql db<br/>";
}
public function connect() {
}
public function exec() {
}
}
class PostgreDB implements DB
{
public function __construct() {
echo "Postgre db<br/>";
}
public function connect() {
}
public function exec() {
}
}
class MssqlDB implements DB
{
public function __construct() {
echo "mssql db<br/>";
}
public function connect() {
}
public function exec() {
}
}
$oMysql = DBFactory::create("Mysql");
$oPostgre = DBFactory::create("Postgre");
$oMssql = DBFactory::create("Mssql");