让CI框架支持service层

<?php
 
class MY_Service
{
    public function __construct()
    {
        log_message(‘debug‘, "Service Class Initialized");
        
    }
 
    function __get($key)
    {
        $CI = & get_instance();
        return $CI->$key;
    }
}

<?php
 
class MY_Loader extends CI_Loader
{
    /**
     * List of loaded sercices
     *
     * @var array
     * @access protected
     */
    protected $_ci_services = array();
    /**
     * List of paths to load sercices from
     *
     * @var array
     * @access protected
     */
    protected $_ci_service_paths        = array();
    
    /**
     * Constructor
     * 
     * Set the path to the Service files
     */
    public function __construct()
    {
        
        parent::__construct();
        load_class(‘Service‘,‘core‘);
        $this->_ci_service_paths = array(APPPATH);
    }
    
    /**
     * Service Loader
     * 
     * This function lets users load and instantiate classes.
     * It is designed to be called from a user‘s app controllers.
     *
     * @param    string    the name of the class
     * @param    mixed    the optional parameters
     * @param    string    an optional object name
     * @return    void
     */
    public function service($service = ‘‘, $params = NULL, $object_name = NULL)
    {
        if(is_array($service))
        {
            foreach($service as $class)
            {
                $this->service($class, $params);
            }
            
            return;
        }
        
        if($service == ‘‘ or isset($this->_ci_services[$service])) {
            return FALSE;
        }
 
        if(! is_null($params) && ! is_array($params)) {
            $params = NULL;
        }
        
        $subdir = ‘‘;
 
        // Is the service in a sub-folder? If so, parse out the filename and path.
        if (($last_slash = strrpos($service, ‘/‘)) !== FALSE)
        {
                // The path is in front of the last slash
                $subdir = substr($service, 0, $last_slash + 1);
 
                // And the service name behind it
                $service = substr($service, $last_slash + 1);
        }
        
        foreach($this->_ci_service_paths as $path)
        {
            
            $filepath = $path .‘service/‘.$subdir.$service.‘.php‘;
            
            if ( ! file_exists($filepath))
            {
                continue;
            }
            
            include_once($filepath);
            
            $service = strtolower($service);
 
            if (empty($object_name))
            {
                $object_name = $service;
            }
            
            $service = ucfirst($service);
            $CI = &get_instance();
            if($params !== NULL)
            {
                $CI->$object_name = new $service($params);
            }
            else
            {
                $CI->$object_name = new $service();
            }
            
            $this->_ci_services[] = $object_name;
            
            return;
        }
    }
    
}