PHP面向切面编程组件(2)

            unset(self::$extFamily->_extensionArray[$extName]); 
        } 
    } 
     
    public static function addExtension($extName, Extension $ext){ 
        if(is_null(self::$extFamily)){ 
            throw new Exception("Please createExtension first"); 
            return false; 
        }else{ 
            self::$extFamily->_extensionArray[$extName] = $ext; 
        } 
    } 
     
    public static function removeAllExtension(){ 
        if(is_null(self::$extFamily)){ 
            throw new Exception("Please createExtension first"); 
            return false; 
        }else{ 
            foreach(self::$extFamily->_extensionArray as $extName=>$ext){ 
                unset(self::$extFamily->_extensionArray[$extName]); 
            } 
        } 
    } 
} 
<?php
if (function_exists('__autoload')) {
 trigger_error("Extension: It looks like your code is using an __autoload() function. Extension uses spl_autoload_register() which will bypass your __autoload() function and may break autoloading.", E_USER_WARNING);
}

spl_autoload_register(array('ExtensionFactory', 'autoload'));

class ExtensionFactory {
   
    private static $extFamily = null;
    private static $_classes = array(
        'Extension' =>  '/Extension.php',
        'ExtensionFamily' =>  '/ExtensionFamily.php'
    );
   
    /**
     * Class autoloader. This method is provided to be invoked within an
     * __autoload() magic method.
     * @param string $className The name of the class to load.