父类是否应包含在子类中？PHP

假设我有4个文件，其中3个包含每个类：

animal.php

class animal
{}

class cat extends animal
{}

class dog extends animal
{}

$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
require_once('cat.php');
require_once('dog.php');
$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
class dog extends animal
{}

require_once('animal.php');
class dog extends animal
{}

cat.php

class animal
{}

class cat extends animal
{}

class dog extends animal
{}

$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
require_once('cat.php');
require_once('dog.php');
$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
class dog extends animal
{}

require_once('animal.php');
class dog extends animal
{}

dog.php

class animal
{}

class cat extends animal
{}

class dog extends animal
{}

$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
require_once('cat.php');
require_once('dog.php');
$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
class dog extends animal
{}

require_once('animal.php');
class dog extends animal
{}

main.php

class animal
{}

class cat extends animal
{}

class dog extends animal
{}

$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
require_once('cat.php');
require_once('dog.php');
$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
class dog extends animal
{}

require_once('animal.php');
class dog extends animal
{}

我想知道在每个子类中或者在main.php中包含或要求animal.php是否是更好的做法

换句话说，它是否更好：

main.php

class animal
{}

class cat extends animal
{}

class dog extends animal
{}

$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
require_once('cat.php');
require_once('dog.php');
$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
class dog extends animal
{}

require_once('animal.php');
class dog extends animal
{}

或

dog.php

class animal
{}

class cat extends animal
{}

class dog extends animal
{}

$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
require_once('cat.php');
require_once('dog.php');
$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
class dog extends animal
{}

require_once('animal.php');
class dog extends animal
{}

cat.php

class animal
{}

class cat extends animal
{}

class dog extends animal
{}

$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
require_once('cat.php');
require_once('dog.php');
$cat = new cat();
$cat->doSomething();
$dog = new dog();
$dog->runAroundTryToCatchTail();

require_once('animal.php');
class dog extends animal
{}

require_once('animal.php');
class dog extends animal
{}

更新

事实上，我想知道的是：

---

<> P>在选择我的类文件时，我是否应该考虑任何实质性的原则或掌握或其他OOP实践？

< P>最佳实践是使用AutoLoad加载所需的类并遵循PSR-0标准。

阅读更多关于PSR-0的信息

了解更多有关自动加载器的信息

如何自动加载PSR-0后面的文件

---

根据

您可以使用PSR-4作为新的自动加载标准

---

更好的做法是使用自动加载器。两者都不应该使用。@MarkBaker应该想到这一点。。。该死的，我真蠢。谢谢你，正是我所需要的@塞巴斯蒂安我很乐意帮忙you@Sebastien我已经更新了答案，请审查，如果它确实帮助您标记为接受：）将不胜感激