PHP5自动加载spl_自动加载失败

我有下面的代码作为一个自动加载类，然而，似乎clean方法根本不起作用，它总是落在dirty方法上。

我是否错误地使用了spl_autoload ?如果是这样，正确的(更好的)方法是什么?这是低效的吗，如何改进?

当使用这个方法时，我总是得到输出，如底部，在某些情况下，它只是找不到类，但不会抛出任何错误我有显示错误设置为1，并检查了错误日志，但只是完全丢失。

require "vendor/AutoLoader.class.php";
self::setGlobal("autoloader", AutoLoader::init());

类如下:

public static $instance;
private $_src=array('vendor/', 'lib/', '');
private $_sub=array('base/', '');
private $_ext=array('.php', 'class.php', 'lib.php');
/* initialize the autoloader class */
public static function init(){
    if(self::$instance==NULL){
        self::$instance=new self();
    }
    return self::$instance;
}
/* put the custom functions in the autoload register when the class is initialized */
private function __construct(){
    spl_autoload_register(array($this, 'clean'));
    spl_autoload_register(array($this, 'dirty'));
}
/* the clean method to autoload the class without any includes, works in most cases */
private function clean($class){
    $class=str_replace('_', '/', $class);
    spl_autoload_extensions(implode(',', $this->_ext));
    foreach($this->_src as $resource){
      foreach($this->_sub as $sub){
        echo 'Trying to load ', $class, ' via ', __METHOD__, "()<br />";
        set_include_path(pegFramework::getGlobal("baseDir") . $resource.$sub);
        spl_autoload($class);
        if(class_exists($class)) {
          echo 'Found and clean included '.$class.' in '.$resource.$sub."<br />";
          break 2;
        }
      }
    }
}
/* the dirty method to autoload the class after including the php file containing the class */
private function dirty($class){
    global $docroot;
    $class=str_replace('_', '/', $class);
    foreach($this->_src as $resource){
        foreach($this->_ext as $ext){
          foreach($this->_sub as $sub){
            echo 'Trying to load ', $class, ' via ', __METHOD__, "()<br />";
            if(@include(pegFramework::getGlobal("baseDir") . $resource . $sub. $class . $ext)) {
              echo 'Found and dirty included '.$class.' as '.$resource . $sub. $class . $ext."<br />";
              break 3;
            }
          }
        }
    }
    spl_autoload($class);
}

Trying to load pegDatabase via pegAutoloader::clean()
...snip...
Trying to load pegDatabase via pegAutoloader::clean()
Trying to load pegDatabase via pegAutoloader::dirty()
Trying to load pegDatabase via pegAutoloader::dirty()
Trying to load basepegDatabase via pegAutoloader::clean()
...snip...
Trying to load basepegDatabase via pegAutoloader::clean()
Trying to load basepegDatabase via pegAutoloader::dirty()
Found and dirty included basepegDatabase as vendor/base/basepegDatabase.php
Found and dirty included pegDatabase as vendor/pegDatabase.php
Trying to load pegRequest via pegAutoloader::clean()
...snip...
Trying to load pegRequest via pegAutoloader::clean()
Trying to load pegRequest via pegAutoloader::dirty()
Trying to load pegRequest via pegAutoloader::dirty()
Found and dirty included pegRequest as vendor/pegRequest.php
Trying to load pegFacebook via pegAutoloader::clean()
...snip...
Trying to load pegFacebook via pegAutoloader::clean()
Trying to load pegFacebook via pegAutoloader::dirty()
...snip...
Trying to load pegFacebook via pegAutoloader::dirty()
Trying to load Facebook via pegAutoloader::clean()
Trying to load Facebook via pegAutoloader::clean()
...snip...
Trying to load Facebook via pegAutoloader::dirty()
Trying to load Facebook via pegAutoloader::dirty()
Trying to load Facebook via pegAutoloader::dirty()
...snip...
Trying to load Facebook via pegAutoloader::dirty()
Trying to load Facebook via pegAutoloader::dirty()
...snip...
Trying to load Facebook via pegAutoloader::dirty()