一个强大的PHP缓存类(3)

        }  
        /*echo '<br />--returnning data for key:'.$key;
        var_dump($data);*/
        return $data;
    }
    
    //delete key from cache
    public function delete($key){
        switch($this->cache_type){
            case 'eaccelerator':
                eaccelerator_rm($key);
            break;
 
            case 'apc':
                apc_delete($key);
            break;
 
            case 'xcache':
                xcache_unset($key);
            break;
 
            case 'memcache':
                $this->cache_external->delete($key);
            break;
            
            case 'filecache':
                $this->cache_external->delete($key);
            break;
        }  
    
    }
    // Overloading for the Application variables and automatically cached
        public function __set($name, $value) {
            $this->put($name, $value, $this->cache_expire);
        }
    
        public function __get($name) {
            return $this->get($name);
        }
    
        public function __isset($key) {//echo "Is '$name' set?\n"
            if ($this->get($key) !== false)  return true;
            else return false;
        }
    
        public function __unset($name) {//echo "Unsetting '$name'\n";
            $this->delete($name);
        }
    //end overloads
    
    public function getCacheType(){
        return $this->$this->cache_type;
    }  
    
    //sets the cache if its installed if not triggers error
    public function setCacheType($type){
        $this->cache_type=strtolower($type);
        
        switch($this->cache_type){
            case 'eaccelerator':
                if (function_exists('eaccelerator_get')) $this->cache_type = 'eaccelerator';
                else $this->cacheError('eaccelerator not found');   
            break;
 
            case 'apc':
                if (function_exists('apc_fetch')) $this->cache_type = 'apc' ;