复制代码 代码如下:

<?php

/**

* 工厂方法模式

*

* 定义一个用于创建对象的接口,让子类决定将哪一个类实例化,使用一个类的实例化延迟到其子类

*/

/*

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");