PHP：使用命名空间自动加载多个类

Question

I'm trying to build my own framework for internal usage. I got structure like this:

index.php
boot /
    booter.php
application /
     controllers /
           indexcontroller.php
core /
    template.class.php
    model.class.php
    controller.class.php
    cache / 
         memcached.php
    something /
         something.php

Booter.php contains: (it's currently working only with files located in core directory):

class Booter
{
private static $controller_path, $model_path, $class_path;

public static function setDirs($controller_path = 'application/controllers', $model_path = 'application/models', $classes_path = 'core')
{
    self::$controller_path = $controller_path;
    self::$model_path      = $model_path;
    self::$class_path      = $classes_path;

    spl_autoload_register(array('Booter', 'LoadClass'));
    if ( DEBUG ) 
        Debugger::log('Setting dirs...');
}

protected static function LoadClass($className) 
{
    $className = strtolower($className);

    if ( file_exists(DIR . '/' . self::$model_path . '/' . $className . '.php') ) 
    {
        require(DIR . '/' . self::$model_path . '/' . $className . '.php');
    }       
    else if ( file_exists(DIR . '/' . self::$class_path . '/' . $className . '.class.php') ) 
    {
        require(DIR . '/' . self::$class_path . '/' . $className . '.class.php');
    }
    else if ( file_exists(DIR . '/' . self::$controller_path . '/' . $className . '.php') )
    {
        require(DIR . '/' . self::$controller_path . '/' . $className . '.php');
    }

    if ( DEBUG )
        Debugger::log('AutoLoading classname: '.$className);
}
}

My application/controllers/indexcontroller looks like this:

<?
class IndexController extends Controller
{
     public function ActionIndex()
     {
          $a = new Model; // It works
          $a = new Controller; //It works too
     }
}

?>

And here comes my questions:

[Question 1]

My code is working currently like this:

$a = new Model; // Class Model gets included from core/model.class.php

How I can implement including files by classes with namespaces? For example:

$a = new Cache\Memcached; // I would like to include file from /core/CACHE/Memcached.php
$a = new AnotherNS\smth; // i would like to include file from /core/AnotherNS/smth.php 

and so on. How I can produce the handling of the namespace?

[Question 2]

Is it a good practice to use single autoload for Classes, Controllers and models or I should define 3 different spl_autoload_register with 3 different methods and why?

Answer 1

Question 1:

In your autoloader, change the \ (for the namespace) into DIRECTORY_SEPARATOR. This should work:

protected static function LoadClass($className) 
{
    $className = strtolower($className);
    $className = str_replace('\\', DIRECTORY_SEPARATOR, $className);
...
}

Always use DIRECTORY_SEPARATOR, especially if the software has the potential to be used on other platforms.

Question 2:

I would use one and separate your classes by namespace. However, I think that comes down to how you want to structure your framework and how you separate your code. Someone else may be able to better answer that question.