php设计模式 Factory(工厂模式)
2018-09-07 17:14
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);