目的
简单工厂模式是一个精简版的工厂模式。
它与静态工厂模式最大的区别是它不是『静态』的。因为非静态，所以你可以拥有多个不同参数的工厂，你可以为其创建子类。甚至可以模拟（Mock）他，这对编写可测试的代码来讲至关重要。 这也是它比静态工厂模式受欢迎的原因！
代码
SimpleFactory.php
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<?php
namespace DesignPatterns\Creational\SimpleFactory;
class SimpleFactory
{
public function createBicycle(): Bicycle
{
return new Bicycle();
}
}
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Bicycle.php
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<?php
namespace DesignPatterns\Creational\SimpleFactory;
class Bicycle
{
public function driveTo(string $destination)
{
return $destination;
}
}
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用法
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$factory = new SimpleFactory();
$bicycle = $factory->createBicycle();
$bicycle->driveTo('Paris');
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测试
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<?php
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);
}
}
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