php设计模式 Factory(工厂模式)

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)

{
氢键是不是共价键
ca “mysql”:

return new mysqldb(); break;

ca “postgre”:

return new postgredb(); break;

ca “mssql”:

return new mssqldb(); break;

}

}

}

*/

class dbfactory

{

public static function create($type)

{

$class = $type.”db”;

return new $class;

}

}

interface db

{

public function connect();

public func买古筝tion exec();

}

class mysqldb implements db

{

public function __construct() {

echo “mysql db<br/>”;

}

public function connect() {

}

public function exec() {

}

重庆军校}

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/>母爱小故事;”;

}

public function connect() {

}

public function exec() {

}

}

$omysql = dbfactory::create(“mysql”);

$opostgre = dbfactory::create(“postgre”);

$omssql = dbfactory::create(“mssql”);