使用 SplClassLoader 自动加载 PHP? [英] PHP Autoloading with SplClassLoader?

问题描述

我正在学习 PHP 5.3 中的命名空间，我想使用命名空间自动加载.我找到了这个 SplClassLoader 类，但我不知道它是如何工作的.

I'm learning about namespaces in PHP 5.3 and I would like to use Namespaces Autoloading. I found this SplClassLoader class, but I can't figure out how it works.

假设我有这样的目录结构:

Let's say I have directory structure like this:

system
  - framework
    - http
      - request.php
      - response.php
index.php
SplClassLoader.php

如何启用类自动加载?request.php 和 response.php 应该有哪些命名空间?

How do I enable class autoloading? What namespaces should request.php and response.php have?

这是request.php:

namespace frameworkhttp;

class Request
{
    public function __construct()
    {
        echo __CLASS__ . " constructer!";
    }
} 

这是response.php:

namespace frameworkhttp;

class Request
{            
    public function __construct()
    {      
        echo __CLASS__ . " constructed!";                
    }           
}   

在 index.php 中我有:

require_once("SplClassLoader.php");
$loader = new SplClassLoader('frameworkhttp', 'system/framework');
$loader->register();

$r = new Request();

我收到此错误消息:

Fatal error: Class 'Request' not found in C:wampapachehtdocsphp_autoloadingindex.php on line 8

为什么这不起作用?我如何在我的项目中使用 SplClassLoader 以便它加载/需要我的类，以及我应该如何设置和命名文件夹和命名空间?

Why is this not working? How can I use SplClassLoader in my projects so it loads/requires my classes, and how should I setup and name folders and namespaces?

推荐答案

您的文件和目录名称需要与您的类和命名空间的大小写完全匹配，如下例所示:

Your file and directory names need to match the case of your classes and namespaces exactly, as in the following example:

system
  - framework
    - http
      - Request.php
      - Response.php
index.php
SplClassLoader.php

另外，注册SplClassLoader对象时只需要声明根命名空间，如下:

Additionally, you only need to declare the root namespace when registering the SplClassLoader object, as follows:

<?php

    require_once("SplClassLoader.php");
    $loader = new SplClassLoader('framework', 'system/framework');
    $loader->register();

    use frameworkhttpRequest;

    $r = new Request();

?>

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