目的

SimpleFactory 是一个简单的工厂模式。

它不同于静态工厂，因为它不是静态的。因此，您可以拥有多个工厂，可以有不同的参数，可以进行子类化，也可以模拟。它总是比静态工厂更受欢迎！

UML 图

代码

SimpleFactory.php

<?php

declare(strict_types=1);

namespace DesignPatterns\Creational\SimpleFactory;

class SimpleFactory
{
    public function createBicycle(): Bicycle
    {
        return new Bicycle();
    }
}

Bicycle.php

<?php

declare(strict_types=1);

namespace DesignPatterns\Creational\SimpleFactory;

class Bicycle
{
    public function driveTo(string $destination)
    {
    }
}

用法

 $factory = new SimpleFactory();
 $bicycle = $factory->createBicycle();
 $bicycle->driveTo('Paris');

测试

Tests/SimpleFactoryTest.php

<?php

declare(strict_types=1);

namespace DesignPatterns\Creational\SimpleFactory\Tests;

use DesignPatterns\Creational\SimpleFactory\Bicycle;
use DesignPatterns\Creational\SimpleFactory\SimpleFactory;
use PHPUnit\Framework\TestCase;

class SimpleFactoryTest extends TestCase
{
    public function testCanCreateBicycle()
    {
        $bicycle = (new SimpleFactory())->createBicycle();
        $this->assertInstanceOf(Bicycle::class, $bicycle);
    }
}