爲什麼教條2.2使用-namespace-和-use-而沒有任何include或require聲明..？

Question

 I am studying namespace in php and **Doctrine 2.2** for a week. 
I explorered several blogs and read several articles about namespace in php. 
    And i understand that, when we want to use different namepaces in different php pages, 
we must write: include('php page that belong namespace we want to use'); 

    But Doctrine 2.2 doesn't use any include or require or require_once 
statements for using namespace. Almost all script in **Doctrine 2.2** like that : 

/*i am at Doctrine\ORM\EntityManager.php */ 

    **<?php 
    namespace Doctrine\ORM; 

use Closure, Exception, 
    Doctrine\Common\EventManager, 
    Doctrine\Common\Persistence\ObjectManager, 
    Doctrine\DBAL\Connection, 
    Doctrine\DBAL\LockMode, 
    Doctrine\ORM\Mapping\ClassMetadata, 
    Doctrine\ORM\Mapping\ClassMetadataFactory, 
    Doctrine\ORM\Query\ResultSetMapping, 
    Doctrine\ORM\Proxy\ProxyFactory, 
    Doctrine\ORM\Query\FilterCollection; 
class EntityManager implements ObjectManager 
{ 
    /** 
    * The used Configuration. 
    * 
    * @var \Doctrine\ORM\Configuration 
    ............. 
    .................................. 
    .................................. 
    .................................. 
    .................................. 
?>** 
    There isn't any include or require statement in **Doctrine 2.2**. 
But we run the page (Doctrine\ORM\EntityManager.php) appear fatal error, 

致命錯誤： 接口 '學說\共同\持久性\的ObjectManager' 未找到用C ：\ XAMPP \ htdocs中\ WWW \ DoctrineExplained \ DoctrineORM \學說\ ORM \ EntityManager.php第45行上

Although **Doctrine 2.2** is stable version of **Doctrine ORM**, 
why doesn't use include or require for --namespaces-- and --uses--? 

Answer 1

大部分PHP 5.3代碼都是這樣的。 Doctrine希望在開始使用之前設置自動加載。您可以定義您自己的__autoload（）函數，使用spl_register_autoload（）或使用與其中許多框架捆綁在一起的其中一個實現。

這也可以做很長時間。在這些約定被修改和命名空間推動這一改變之前，這需要時間。